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Surface engineering to upgrade spent LiCoO2 by removing Al impurity SCIE
期刊论文 | 2025 , 638 | JOURNAL OF POWER SOURCES
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Abstract :

Developing rational regeneration protocol to upgrade spent cathode material for their usage in next generation lithium-ion batteries (LIBs) can alleviate resource stress and benefit environment and carbon neutrality. This work demonstrates that direct regeneration of spent LiCoO2(LCO) encounters the negative effects of Al impurity, which is a common impurity in the spent LIB materials introduced during battery cycling and disassembly process. Our microanalysis show that Al impurity tends to segregate on the LCO surface during the direct regeneration process, which not only causes poor surface regeneration but also degenerates the surface modification effect for upgrading purpose. We therefore propose a one-pot protocol by using a bifunctional solution to realize Al impurity removal and Ti surface coating simultaneously, which successfully upgrade the spent LCO for high voltage and high-power usage. The upgraded LCO cathode can achieve 90 % and 97 % capacity retentions at 0.2C and 2C rates after 2.8-4.5 V 100 cycles, and their initial specific capacity is 180 mAh/g and 149 mAh/g, respectively. The microstructure characterizations in this work provide in-depth understanding of the direct regeneration process, which is essential for understanding and optimizing the recycling process. Further economic analysis show that the established regeneration protocol holds promise for realizing large-scale industrial recycling process of spent LCO.

Keyword :

Spent LiCoO2 Spent LiCoO2 Upgrading process Upgrading process Surface modification Surface modification Direct regeneration Direct regeneration Al impurity Al impurity

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GB/T 7714 Mu, Xulin , Dong, Enhua , Huang, Kai et al. Surface engineering to upgrade spent LiCoO2 by removing Al impurity [J]. | JOURNAL OF POWER SOURCES , 2025 , 638 .
MLA Mu, Xulin et al. "Surface engineering to upgrade spent LiCoO2 by removing Al impurity" . | JOURNAL OF POWER SOURCES 638 (2025) .
APA Mu, Xulin , Dong, Enhua , Huang, Kai , Li, Chao , Liu, Jingzi , Sui, Manling et al. Surface engineering to upgrade spent LiCoO2 by removing Al impurity . | JOURNAL OF POWER SOURCES , 2025 , 638 .
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Deciphering cycling voltage-dependent failures of O3-layered cathode for sodium ion battery SCIE
期刊论文 | 2024 , 12 (19) , 11681-11690 | JOURNAL OF MATERIALS CHEMISTRY A
WoS CC Cited Count: 4
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Abstract :

The high energy density and low-cost O3-layered NaNi1/3Fe1/3Mn1/3O2 (NFM) is a representative layered cathode for sodium-ion batteries (SIBs). However, its long-term cycling stability needs further improvement and its high voltage usage is highly desired, which is quite challenging. The lack of full understanding of the cycling-induced failures hinders material optimization. Herein, we utilize advanced microanalysis techniques to comprehensively investigate the failure mechanisms of the O3-NFM layered cathode upon low-voltage (2.0-4.0 V) and high-voltage (2.0-4.3 V) cycling. We found that surface degradations play a dominant role during low-voltage cycling, and bulk failures become prominent upon high-voltage cycling. Surface cracking, corrosion, and structure transition together lead to slow charge transfer kinetics, resulting in chronic capacity decay. Bulk degradations such as intragranular cracking, void formation, and interlayer cation mixing severely deteriorate Na storage performance and Na diffusion kinetics, causing rapid capacity decay and voltage fading issues, which are the main challenges of the NFM layered cathode for high voltage usage. High charging cutoff voltage activates the cation migration and condensation, causing a highly disordered layered structure but no phase transition occurs in the bulk. Synergistically stabilizing the surface and bulk structure of the high-voltage O3-layered cathode is essential for achieving superior electrochemical performance. Interfacial degradations dominate the performance decay of O3-layered cathode during low-voltage cycling; high voltage cycling induced bulk failures cause rapid performance decay due to transition metal cation migration.

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GB/T 7714 Zhao, Xuejiao , Zhang, Lihan , Wang, Xiaoqi et al. Deciphering cycling voltage-dependent failures of O3-layered cathode for sodium ion battery [J]. | JOURNAL OF MATERIALS CHEMISTRY A , 2024 , 12 (19) : 11681-11690 .
MLA Zhao, Xuejiao et al. "Deciphering cycling voltage-dependent failures of O3-layered cathode for sodium ion battery" . | JOURNAL OF MATERIALS CHEMISTRY A 12 . 19 (2024) : 11681-11690 .
APA Zhao, Xuejiao , Zhang, Lihan , Wang, Xiaoqi , Li, Jinhui , Zhang, Lin , Liu, Di et al. Deciphering cycling voltage-dependent failures of O3-layered cathode for sodium ion battery . | JOURNAL OF MATERIALS CHEMISTRY A , 2024 , 12 (19) , 11681-11690 .
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Early-stage latent thermal failure of single-crystal Ni-rich layered cathode SCIE
期刊论文 | 2024 , 96 , 578-587 | JOURNAL OF ENERGY CHEMISTRY
WoS CC Cited Count: 1
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Abstract :

High nickel content worsens the thermal stability of layered cathodes for lithium-ion batteries, raising safety concerns for their applications. Thoroughly understanding the thermal failure process can offer valuable guidance for material optimization on thermal stability and new opportunities in monitoring battery thermal runaway (TR). Herein, this work comprehensively investigates the thermal failure process of a single-crystal nickel-rich layered cathode and finds that the latent thermal failure starts at similar to 120 degrees C far below the TR temperature (225 degrees C). During this stage of heat accumulation, sequential structure transition is revealed by atomic resolution electron microscopy, which follows the layered -> cation mixing layered -> LiMn2O4-type spinel -> disordered spinel -> rock salt. This progression occurs as a result of the continuous migration and densification of transition metal cations. Phase transition generates gaseous oxygen, initially confined within the isolated closed pores, thereby not showing any thermal failure phenomena at the macro-level. Increasing temperature leads to pore growth and coalescence, and eventually to the formation of open pores, causing oxygen gas release and weight loss, which are the typical TR features. We highlight that latent thermal instability occurs before the macro-level TR, suggesting that suppressing phase transitions caused by early thermal instability is a crucial direction for material optimization. Our findings can also be used for early warning of battery thermal runaway.

Keyword :

Transmission electron microscopy Transmission electron microscopy Nickel-rich layered cathode Nickel-rich layered cathode Lithium -ion battery Lithium -ion battery Phase transition Phase transition Thermal runaway Thermal runaway

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GB/T 7714 Han, Xiao , Xu, Ruoyu , Li, Yan et al. Early-stage latent thermal failure of single-crystal Ni-rich layered cathode [J]. | JOURNAL OF ENERGY CHEMISTRY , 2024 , 96 : 578-587 .
MLA Han, Xiao et al. "Early-stage latent thermal failure of single-crystal Ni-rich layered cathode" . | JOURNAL OF ENERGY CHEMISTRY 96 (2024) : 578-587 .
APA Han, Xiao , Xu, Ruoyu , Li, Yan , Ding, Yang , Zhang, Manchen , Wang, Bo et al. Early-stage latent thermal failure of single-crystal Ni-rich layered cathode . | JOURNAL OF ENERGY CHEMISTRY , 2024 , 96 , 578-587 .
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Quantifying Degradation Parameters of Single-Crystalline Ni-Rich Cathodes in Lithium-Ion Batteries SCIE
期刊论文 | 2023 , 62 (32) | ANGEWANDTE CHEMIE-INTERNATIONAL EDITION
WoS CC Cited Count: 21
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Abstract :

Single-crystal LiNixCoyMnzO2 (SC-NCM, x+y+z=1) cathodes are renowned for their high structural stability and reduced accumulation of adverse side products during long-term cycling. While advances have been made using SC-NCM cathode materials, careful studies of cathode degradation mechanisms are scarce. Herein, we employed quasi single-crystalline LiNi0.65Co0.15Mn0.20O2 (SC-NCM65) to test the relationship between cycling performance and material degradation for different charge cutoff potentials. The Li/SC-NCM65 cells showed >77 % capacity retention below 4.6 V vs. Li+/Li after 400 cycles and revealed a significant decay to 56 % for 4.7 V cutoff. We demonstrate that the SC-NCM65 degradation is due to accumulation of rock-salt (NiO) species at the particle surface rather than intragranular cracking or side reactions with the electrolyte. The NiO-type layer formation is also responsible for the strongly increased impedance and transition-metal dissolution. Notably, the capacity loss is found to have a linear relationship with the thickness of the rock-salt surface layer. Density functional theory and COMSOL Multiphysics modeling analysis further indicate that the charge-transfer kinetics is decisive, as the lower lithium diffusivity of the NiO phase hinders charge transport from the surface to the bulk.

Keyword :

Multiphysics Analysis Multiphysics Analysis Structural Stability Structural Stability Single-Crystal Cathodes Single-Crystal Cathodes Transfer Kinetics Transfer Kinetics Rock-Salt Formation Rock-Salt Formation

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GB/T 7714 Zhao, Wengao , Wang, Kuan , Fan, Xinming et al. Quantifying Degradation Parameters of Single-Crystalline Ni-Rich Cathodes in Lithium-Ion Batteries [J]. | ANGEWANDTE CHEMIE-INTERNATIONAL EDITION , 2023 , 62 (32) .
MLA Zhao, Wengao et al. "Quantifying Degradation Parameters of Single-Crystalline Ni-Rich Cathodes in Lithium-Ion Batteries" . | ANGEWANDTE CHEMIE-INTERNATIONAL EDITION 62 . 32 (2023) .
APA Zhao, Wengao , Wang, Kuan , Fan, Xinming , Ren, Fucheng , Xu, Xieyu , Liu, Yangyang et al. Quantifying Degradation Parameters of Single-Crystalline Ni-Rich Cathodes in Lithium-Ion Batteries . | ANGEWANDTE CHEMIE-INTERNATIONAL EDITION , 2023 , 62 (32) .
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Mitigating Twin Boundary-Induced Cracking for Enhanced Cycling Stability of Layered Cathodes SCIE
期刊论文 | 2023 , 6 (9) | ACS APPLIED ENERGY MATERIALS
WoS CC Cited Count: 4
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Abstract :

Twin boundaries (TBs) as a common defect in layered cathodes play multiple roles in affecting materials' performance, which requires a deep understanding and an effective regulation method to realize rational design of superior layered cathodes. Herein, by virtue of advanced electron microscopy, we demonstrate that TBs can be quantitatively estimated and characterized, and we further validate that TBs can initiate massive cracks upon electrochemical cycling, which aggravates the performance decay of LiNiO2. Adjusting the synthesis conditions cannot avoid TB formation for the solid-state method, but fortunately, we find that a coprecipitation method can effectively eliminate TBs; thus, the improved cycling stability of LiNiO2 is achieved. We further validate that TB-free LiCoO2 can also be synthesized by the coprecipitation method, which demonstrates improved cycling stability.

Keyword :

lithium-ion battery lithium-ion battery cracking cracking LiNiO2 LiNiO2 twin boundary twin boundary layered cathode layered cathode

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GB/T 7714 Mu, Xulin , Hui, Xiaojuan , Wang, Mingming et al. Mitigating Twin Boundary-Induced Cracking for Enhanced Cycling Stability of Layered Cathodes [J]. | ACS APPLIED ENERGY MATERIALS , 2023 , 6 (9) .
MLA Mu, Xulin et al. "Mitigating Twin Boundary-Induced Cracking for Enhanced Cycling Stability of Layered Cathodes" . | ACS APPLIED ENERGY MATERIALS 6 . 9 (2023) .
APA Mu, Xulin , Hui, Xiaojuan , Wang, Mingming , Wang, Kuan , Li, Yan , Zhang, Yuefei et al. Mitigating Twin Boundary-Induced Cracking for Enhanced Cycling Stability of Layered Cathodes . | ACS APPLIED ENERGY MATERIALS , 2023 , 6 (9) .
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Interfacial Chemistry Enables Highly Reversible Na Extraction/Intercalation in Layered-Oxide Cathode Materials SCIE
期刊论文 | 2023 | CHINESE JOURNAL OF CHEMISTRY
WoS CC Cited Count: 5
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Abstract :

Layered transition-metal oxides are promising cathode candidates for sodium-ion batteries. However, the inferior interphase formation and particulate fracture during sodiation/desodiation result in structure degradation and poor stability. Herein, the interface chemistry of P2-Na0.640Ni0.343Mn0.657O2 in an electrolyte of 1.0 mol/L NaPF6 in diglyme is unveiled to enable highly reversible Na extraction and intercalation. The uniform and robust cathode-electrolyte interphase layer is in situ formed with decomposition of diglyme molecules and anions in initial cycles. The NaF- and CO-rich CEI film exhibits high mechanical strength and ionic conductivity, which suppresses the reconstruction of its electrode interphase from P2 phase to spinel-like structure and reinforces its structure integrity without cracks. This favours facile Na+ transport and stable bulk redox reactions. It is demonstrated to show long cycling stability with capacity retention of 94.4% for 180 cycles and superior rate capability. This investigation highlights the cathode interphase chemistry in sodium-ion batteries.

Keyword :

Sodium-ion batteries Sodium-ion batteries Ether electrolyte Ether electrolyte Reversibility Reversibility Surface Chemistry Surface Chemistry Cathodes Cathodes Layered oxides Layered oxides

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GB/T 7714 Wang, Chenchen , Wang, Kuan , Ren, Meng et al. Interfacial Chemistry Enables Highly Reversible Na Extraction/Intercalation in Layered-Oxide Cathode Materials [J]. | CHINESE JOURNAL OF CHEMISTRY , 2023 .
MLA Wang, Chenchen et al. "Interfacial Chemistry Enables Highly Reversible Na Extraction/Intercalation in Layered-Oxide Cathode Materials" . | CHINESE JOURNAL OF CHEMISTRY (2023) .
APA Wang, Chenchen , Wang, Kuan , Ren, Meng , Huang, Yaohui , Zhang, Kai , Liao, Changzhong et al. Interfacial Chemistry Enables Highly Reversible Na Extraction/Intercalation in Layered-Oxide Cathode Materials . | CHINESE JOURNAL OF CHEMISTRY , 2023 .
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Mesoporous Single-Crystal Lithium Titanate Enabling Fast-Charging Li-Ion Batteries SCIE
期刊论文 | 2022 , 34 (18) | ADVANCED MATERIALS
WoS CC Cited Count: 57
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Abstract :

There remain significant challenges in developing fast-charging materials for lithium-ion batteries (LIBs) due to sluggish ion diffusion kinetics and unfavorable electrolyte mass transportation in battery electrodes. In this work, a mesoporous single-crystalline lithium titanate (MSC-LTO) microrod that can realize exceptional fast charge/discharge performance and excellent long-term stability in LIBs is reported. The MSC-LTO microrods are featured with a single-crystalline structure and interconnected pores inside the entire single-crystalline body. These features not only shorten the lithium-ion diffusion distance but also allow for the penetration of electrolytes into the single-crystalline interior during battery cycling. Hence, the MSC-LTO microrods exhibit unprecedentedly high rate capability, achieving a specific discharge capacity of approximate to 174 mAh g(-1) at 10 C, which is very close to its theoretical capacity, and approximate to 169 mAh g(-1) at 50 C. More importantly, the porous single-crystalline microrods greatly mitigate the structure degradation during a long-term cycling test, offering approximate to 92% of the initial capacity after 10 000 cycles at 20 C. This work presents a novel strategy to engineer porous single-crystalline materials and paves a new venue for developing fast-charging materials for LIBs.

Keyword :

ion transportation pathway ion transportation pathway fast-charging electrode fast-charging electrode mesoporous single-crystalline structure mesoporous single-crystalline structure lithium titanate lithium titanate lithium-ion batteries lithium-ion batteries

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GB/T 7714 Jin, Xu , Han, Yehu , Zhang, Zhengfeng et al. Mesoporous Single-Crystal Lithium Titanate Enabling Fast-Charging Li-Ion Batteries [J]. | ADVANCED MATERIALS , 2022 , 34 (18) .
MLA Jin, Xu et al. "Mesoporous Single-Crystal Lithium Titanate Enabling Fast-Charging Li-Ion Batteries" . | ADVANCED MATERIALS 34 . 18 (2022) .
APA Jin, Xu , Han, Yehu , Zhang, Zhengfeng , Chen, Yawei , Li, Jianming , Yang, Tingting et al. Mesoporous Single-Crystal Lithium Titanate Enabling Fast-Charging Li-Ion Batteries . | ADVANCED MATERIALS , 2022 , 34 (18) .
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Synergistical Stabilization of Li Metal Anodesand LiCoO2 Cathodes in High-VoltageLi parallel to LiCoO(2 )Batteries by Potassium Selenocyanate (KSeCN) Additive SCIE
期刊论文 | 2022 , 7 (4) , 1364-1373 | ACS ENERGY LETTERS
WoS CC Cited Count: 61
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Abstract :

Dramatic growth of lithium (Li) dendrite andstructural deterioration of LiCoO2(LCO) lead to rapid failureof a high-voltage Li parallel to LCO battery. The nitrile group (-Cxe0c9;N) isbeneficial to maintain the integrity of the LCO lattice due to itsstrong affiliation to Co ions, whereas the-Cxe0c9;N bond isincompatible with the Li metal anode, leading to form adeleterious solid electrolyte interphase (SEI)film. Herein, adual-functional electrolyte additive potassium selenocyanate(KSeCN) is introduced to construct stable and dense SEI/cathode electrolyte interphase (CEI)films by synergistic effectswith-Se and-Cxe0c9;N groups, resulting in uniform Lideposition and a stabilized LCO lattice during cycling. With atrace amount of KSeCN (0.1 wt %) in conventional carbonatedelectrolyte, the Li parallel to LCO battery exhibits promoted cycling performance at high charge cutoff4.6 V. This work provides astrategic guidance for rational design of electrolyte to construct stable SEI and CEIfilms, to achieve a high-energy-densityLi parallel to LCO battery with great performance.

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GB/T 7714 Fu, Ang , Lin, Jiande , Zhang, Zhengfeng et al. Synergistical Stabilization of Li Metal Anodesand LiCoO2 Cathodes in High-VoltageLi parallel to LiCoO(2 )Batteries by Potassium Selenocyanate (KSeCN) Additive [J]. | ACS ENERGY LETTERS , 2022 , 7 (4) : 1364-1373 .
MLA Fu, Ang et al. "Synergistical Stabilization of Li Metal Anodesand LiCoO2 Cathodes in High-VoltageLi parallel to LiCoO(2 )Batteries by Potassium Selenocyanate (KSeCN) Additive" . | ACS ENERGY LETTERS 7 . 4 (2022) : 1364-1373 .
APA Fu, Ang , Lin, Jiande , Zhang, Zhengfeng , Xu, Chuanjing , Zou, Yue , Liu, Chengyong et al. Synergistical Stabilization of Li Metal Anodesand LiCoO2 Cathodes in High-VoltageLi parallel to LiCoO(2 )Batteries by Potassium Selenocyanate (KSeCN) Additive . | ACS ENERGY LETTERS , 2022 , 7 (4) , 1364-1373 .
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The interphasial degradation of 4.2 V-class poly(ethylene oxide)-based solid batteries beyond electrochemical voltage limit SCIE
期刊论文 | 2022 , 75 , 504-511 | JOURNAL OF ENERGY CHEMISTRY
WoS CC Cited Count: 14
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Abstract :

Solid-state polymer electrolytes (SPEs) have attracted increasing attention due to good interfacial con-tact, light weight, and easy manufacturing. However, the practical application of SPEs such as the most widely studied poly(ethylene oxide) (PEO) in high-energy solid polymer batteries is still challenging, and the reasons are yet elusive. Here, it is found that the mismatch between PEO and 4.2 V-class cathodes is beyond the limited electrochemical window of PEO in the solid LiNi1/3Mn1/3Co1/3O2 (NMC)-PEO batter-ies. The initial oxidation of PEO initiates remarkable surface reconstruction of NMC grains in solid batter-ies that are different from the situation in liquid electrolytes. Well-aligned nanovoids are observed in NMC grains during the diffusion of surface reconstruction layers towards the bulk in solid batteries. The substantial interphasial degradation, therefore, blocks smooth Li' transport across the NMC-PEO interface and causes performance degradation. A thin yet effective LiF-containing protection layer on NMC can effectively stabilize the NMC-PEO interface with a greatly improved lifespan of NMC|PEO|Li bat-teries. This work deepens the understanding of degradations in high-voltage solid-state polymer batteries.(c) 2022 Science Press and Dalian Institute of Chemical Physics, Chinese Academy of Sciences. Published by ELSEVIER B.V. and Science Press. All rights reserved.

Keyword :

Poly(ethylene oxide) Poly(ethylene oxide) Interphasial degradation Interphasial degradation High-energy solid polymer batteries High-energy solid polymer batteries Surface reconstruction Surface reconstruction

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GB/T 7714 Huang, Renzhi , Ding, Yang , Zhang, Fenglin et al. The interphasial degradation of 4.2 V-class poly(ethylene oxide)-based solid batteries beyond electrochemical voltage limit [J]. | JOURNAL OF ENERGY CHEMISTRY , 2022 , 75 : 504-511 .
MLA Huang, Renzhi et al. "The interphasial degradation of 4.2 V-class poly(ethylene oxide)-based solid batteries beyond electrochemical voltage limit" . | JOURNAL OF ENERGY CHEMISTRY 75 (2022) : 504-511 .
APA Huang, Renzhi , Ding, Yang , Zhang, Fenglin , Jiang, Wei , Zhang, Canfu , Yan, Pengfei et al. The interphasial degradation of 4.2 V-class poly(ethylene oxide)-based solid batteries beyond electrochemical voltage limit . | JOURNAL OF ENERGY CHEMISTRY , 2022 , 75 , 504-511 .
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一种Al掺杂的富镍正极单晶材料的制备方法 incoPat zhihuiya
专利 | 2022-05-11 | CN202210511210.1
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Abstract :

本发明公开了一种Al掺杂的富镍正极单晶材料的制备方法,该方法通过控制多次不同球磨处理方式,解决了直接球磨方式中因为原料带结晶水而混合不均一的问题,通过控制连续多次煅烧方式,调控锂含量参数和煅烧时间,最终可以制备出层状结构良好,结晶度高且具有优异电化学性能的Al掺杂的富镍正极单晶材料。通过Al掺杂,不仅可以显著减少富镍正极单晶颗粒的开裂,有效抑制富镍材料在电化学循环过程中的结构退化,而且也能明显减少表面相变程度,在表界面方面同样起着积极的作用。该方法操作简单,成本低廉,适合大规模工业化生产性能优异的Al掺杂正极材料。

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GB/T 7714 闫鹏飞 , 惠小娟 , 夏月明 et al. 一种Al掺杂的富镍正极单晶材料的制备方法 : CN202210511210.1[P]. | 2022-05-11 .
MLA 闫鹏飞 et al. "一种Al掺杂的富镍正极单晶材料的制备方法" : CN202210511210.1. | 2022-05-11 .
APA 闫鹏飞 , 惠小娟 , 夏月明 , 牟许霖 . 一种Al掺杂的富镍正极单晶材料的制备方法 : CN202210511210.1. | 2022-05-11 .
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