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学者姓名:闫鹏飞
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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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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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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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Abstract :
Nitriles as efficient electrolyte additives are widely used in high-voltage lithium-ion batteries. However, their working mechanisms are still mysterious, especially in practical high-voltage LiCoO2 pouch lithium-ion batteries. Herein, we adopt a tridentate ligand-containing 1,3,6-hexanetricarbonitrile (HTCN) as an effective electrolyte additive to shed light on the mechanism of stabilizing high-voltage LiCoO2 cathode (4.5 V) through nitrites. The LiCoO2 lgraphite pouch cells with the HTCN additive electrolyte possess superior cycling performance, 90% retention of the initial capacity after 800 cycles at 25 degrees C, and 72% retention after 500 cycles at 45 degrees C, which is feasible for practical application. Such an excellent cycling performance can be attributed to the stable interface: The HTCN molecules with strong electron-donating ability participate in the construction of cathode-electrolyte interphase (CEI) through coordinating with Co ions, which suppresses the decomposition of electrolyte and improves the structural stability of LiCoO2 during cycling. In summary, the work recognizes a coordinating-based interphase-forming mechanism as an effective strategy to optimize the performance of high voltage LiCoO2 cathode with appropriate electrolyte additives for practical pouch batteries.
Keyword :
high voltage high voltage LiCoO2 LiCoO2 pouch cell pouch cell nitrile additive nitrile additive electrolyte modificationi electrolyte modificationi interface adsorption interface adsorption
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GB/T 7714 | Tang, Chao , Chen, Yawei , Zhang, Zhengfeng et al. Stable cycling of practical high-voltage LiCoO2 pouch cell via electrolyte modification [J]. | NANO RESEARCH , 2022 , 16 (3) : 3864-3871 . |
MLA | Tang, Chao et al. "Stable cycling of practical high-voltage LiCoO2 pouch cell via electrolyte modification" . | NANO RESEARCH 16 . 3 (2022) : 3864-3871 . |
APA | Tang, Chao , Chen, Yawei , Zhang, Zhengfeng , Li, Wenqiang , Jian, Junhua , Jie, Yulin et al. Stable cycling of practical high-voltage LiCoO2 pouch cell via electrolyte modification . | NANO RESEARCH , 2022 , 16 (3) , 3864-3871 . |
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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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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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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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Abstract :
Building phase interface with enough solid-phase contact is of great importance for improving chemical reaction kinetics and depth. High dispersion of electrode materials, especially at the atomic-level, are known for high interface contact, yet their potential application in batteries is restricted due to low loading. Herein, the atomically dispersed metal Ni (Ni in Ni-N-C is 54.9 wt %) with high loading was achieved by ultrahigh N-doping carbon (N/N-C:29.5 wt %) during the discharging process of nickel sulfide, leading to good reversibility and high-capacity maintenance owing to ultrahigh phase contact during long cycling for sodium-ion batteries. It delivers a stable cycling life (0.061% capacity decay per cycle) compared with the poor cyclability (0.418%) for the Ni agglomeration electrode with lower N-doping. The assembled pouch cells achieve robust stability (92.1% after 50 cycles). DFT calculations reveal that ultrahigh N-doping and electrochemically formed Na2S can provide thermally stable Na2S/Ni/NC structures, inhibiting Ni agglomeration during cycling.
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GB/T 7714 | Song, Keming , Liu, Jiefei , Dai, Hongliu et al. Atomically dispersed Ni induced by ultrahigh N-doped carbon enables stable sodium storage [J]. | CHEM , 2021 , 7 (10) : 2684-2694 . |
MLA | Song, Keming et al. "Atomically dispersed Ni induced by ultrahigh N-doped carbon enables stable sodium storage" . | CHEM 7 . 10 (2021) : 2684-2694 . |
APA | Song, Keming , Liu, Jiefei , Dai, Hongliu , Zhao, Yong , Sun, Shuhui , Zhang, Jiyu et al. Atomically dispersed Ni induced by ultrahigh N-doped carbon enables stable sodium storage . | CHEM , 2021 , 7 (10) , 2684-2694 . |
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Abstract :
In this paper, with the temperature-dependent contact coupling stiffness and friction coefficient, a modified closed-loop coupling disc braking model was established. Considering the effective temperature range during the actual braking process, the proposed modified coupling model could predict the high-frequency braking noise tendency with satisfied accuracy. Regarding above, the finite element models of main braking parts were firstly established, all the parts were integrated and connected with the friction coefficient and imaginary springs, and the complex eigenvalue analysis was applied on the closed-loop coupling model to calculate the braking noise tendency, etc. In consequence, the relationships between temperature and two key factors (coupling stiffness and friction coefficient) were investigated. The temperature-dependent contact coupling stiffness and friction coefficient were substituted into the proposed model to predict the noise tendencies, the noise tendencies in different frequency bands varying with temperature were obtained. Finally, the effective temperature range during the actual braking process was extracted from the thermodynamic simulation. Considering the effective temperature range, the modified closed-loop coupling model could accurately identify 87.5% braking noise tendencies, and reach a good consistency with test results. (c) 2020 Elsevier Ltd. All rights reserved.
Keyword :
Effective temperature range Effective temperature range Braking noise tendency Braking noise tendency Friction coefficient Friction coefficient Contact coupling stiffness Contact coupling stiffness Temperature-dependent Temperature-dependent
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GB/T 7714 | Gao, Pu , Du, Yongchang , Ruan, Jiageng et al. Temperature-dependent noise tendency prediction of the disc braking system [J]. | MECHANICAL SYSTEMS AND SIGNAL PROCESSING , 2021 , 149 . |
MLA | Gao, Pu et al. "Temperature-dependent noise tendency prediction of the disc braking system" . | MECHANICAL SYSTEMS AND SIGNAL PROCESSING 149 (2021) . |
APA | Gao, Pu , Du, Yongchang , Ruan, Jiageng , Yan, Pengfei . Temperature-dependent noise tendency prediction of the disc braking system . | MECHANICAL SYSTEMS AND SIGNAL PROCESSING , 2021 , 149 . |
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Abstract :
Sulfide-based all-solid-state lithium-ion batteries (ASSLIBs) are promising candidates in the next generation of energy storage technology; the voltage mismatch and the resulting side reactions at the interface between the cathode and the solid electrolyte, however, dramatically deteriorate their cycling performance. Herein, for the first time, we report that the chemical interaction between LiCoO2 (LCO) and TiO2 can be regulated by two additives, carbon and Li, which in situ form a continuous ultrathin pure-phase Li(LCTO) layer with a stable 3D network of spinel structures, relatively low electronic conductivity (2.5 x 10 S cm) and high lithium diffusion coefficient (D = 8.22 x 10) on the surface of LCO. When assembled in ASSLIBs, such an LCTO layer functions as an interlayer between the LCO and the Li solid electrolyte (LGPS). As a consequence, the original interface LCO/LGPS is substituted by two new interfaces LCO/LCTO and LCTO/LGPS. DFT calculations indicate that, compared with the LCO/LGPS, the new interfaces are not only thermodynamically and electrochemically more compatible, but also have higher interfacial affinity. Therefore, the relevant ASSLIB exhibits evidently reduced interfacial impedance, and it also displays a high initial capacity of 140 mA h g and a reversible discharge specific capacity of 116 mA h g after 200 cycles at room temperature (0.1C). In comparison, the ASSLIB assembled without the LCTO interlayer delivers an initial capacity of 98 mA h g and only retains 22.4% capacity after 100 cycles (0.1C). Even at a high cutoff voltage (4.5 V vs. Li/Li), the ASSLIB with the LCTO interlayer could also exhibit a high initial capacity of 180 mA h g and a remarkable retention of 132 mA h g after 100 cycles.
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GB/T 7714 | Wang, Chuan-Wei , Ren, Fu-Cheng , Zhou, Yao et al. Engineering the interface between LiCoO2 and Li10GeP2S12 solid electrolytes with an ultrathin Li2CoTi3O8 interlayer to boost the performance of all-solid-state batteries [J]. | ENERGY & ENVIRONMENTAL SCIENCE , 2021 , 14 (1) : 437-450 . |
MLA | Wang, Chuan-Wei et al. "Engineering the interface between LiCoO2 and Li10GeP2S12 solid electrolytes with an ultrathin Li2CoTi3O8 interlayer to boost the performance of all-solid-state batteries" . | ENERGY & ENVIRONMENTAL SCIENCE 14 . 1 (2021) : 437-450 . |
APA | Wang, Chuan-Wei , Ren, Fu-Cheng , Zhou, Yao , Yan, Peng-Fei , Zhou, Xiao-Dong , Zhang, Shao-Jian et al. Engineering the interface between LiCoO2 and Li10GeP2S12 solid electrolytes with an ultrathin Li2CoTi3O8 interlayer to boost the performance of all-solid-state batteries . | ENERGY & ENVIRONMENTAL SCIENCE , 2021 , 14 (1) , 437-450 . |
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