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学者姓名：尉海军
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Abstract ：
Stable electrolytes are urgently required for lithium-ion batteries based on lithium-rich layered oxides (LLOs), which generally suffer from fast capacity and voltage decay at high voltages up to 4.8 V. Herein, we report a salt-concentrated electrolyte consisting of 4 M lithium hexafluorophosphate (LiPF6) salt in ester solvents of fluoroethylene carbonate (FEC) and dimethyl carbonate (DMC) to alleviate the above challenges. The solvent structure in the 4 M electrolyte shows more volatile DMC integrated with Li+ and more free antioxidative FEC compared with a 1 M electrolyte, broadening the operation voltage. Simultaneously, this electrolyte endows a thin yet high elasticity modulus LiF-rich interphase on the LLOs surface, which can effectively prevent diverse side reactions and transition metal migration, consequently improving the electrochemical performance with a voltage decay of only 0.46 mV/cycle and capacity retention of 80.3% after 500 cycles. This simple and effective approach boosts the development of high-energy-density batteries using LLOs.
Keyword ：
Lithium-ion battery Lithium-ion battery High elastic modulus High elastic modulus Li-rich layered oxides Li-rich layered oxides Cathode-electrolyte interphase Cathode-electrolyte interphase Salt-concentration electrolyte Salt-concentration electrolyte
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| GB/T 7714 | Han, Zhijie , Liang, Yuan , Zhao, Shu et al. Salt-Concentrated Electrolyte Constructing High Elasticity Modulus Interphase for Li-Rich Layered Oxide Cathode [J]. | ACS APPLIED MATERIALS & INTERFACES , 2024 . |
| MLA | Han, Zhijie et al. "Salt-Concentrated Electrolyte Constructing High Elasticity Modulus Interphase for Li-Rich Layered Oxide Cathode" . | ACS APPLIED MATERIALS & INTERFACES (2024) . |
| APA | Han, Zhijie , Liang, Yuan , Zhao, Shu , Zhu, Qianwen , Zhao, Jingteng , Wang, Errui et al. Salt-Concentrated Electrolyte Constructing High Elasticity Modulus Interphase for Li-Rich Layered Oxide Cathode . | ACS APPLIED MATERIALS & INTERFACES , 2024 . |
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Abstract ：
Fluorinated polymer matrix emerges as a promising candidate owing to their enhanced anti-oxidation ability, but their application is plagued by the relatively low ion conduction ability and the ambiguous ionic conduction mechanism in the fluorinated polymer electrolytes (PEs). Herein, a series of acrylate-based electrolytes with different fluorinated functional units (fluorinated-FUs) of poly(ethyl methacrylate) electrolyte (0F PE), poly (trifluoroethyl methacrylate) electrolyte (3F PE) and poly(hexafluorobutyl methacrylate) electrolyte (6F PE) were investigated. Beneficial from the long fluorinated-FUs in the side chain, the 6F PE exhibits improved both ionic conductivity of 4.0x10(-4) S cm(-1) and Li+ transference number of 0.65 at 25 degrees C, which are superior to those of the 0F PE and the 3F PE. The enhanced ion conduction mechanism was clarified via combining the theoretical calculations and experimental data, where the integration of local fluorinated-FUs provides additional coordinating sites for the continuous Li+ migration and regulates the ion transporting pathways. This work demonstrates that the regulation of local fluorinated-FUs can provide a promising strategy for achieving high performance PEs applied in solid-state batteries.
Keyword ：
Local fluorinated functional units Local fluorinated functional units Polymer electrolytes Polymer electrolytes Mechanism of ion transport Mechanism of ion transport Ion-dipole interaction Ion-dipole interaction Solid-state lithium metal battery Solid-state lithium metal battery
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| GB/T 7714 | Ding, Peipei , Zhao, Shu , Lin, Zhiyuan et al. Local fluorinated functional units enhance Li+ transport in acrylate-based polymer electrolytes for lithium metal batteries [J]. | NANO ENERGY , 2024 , 129 . |
| MLA | Ding, Peipei et al. "Local fluorinated functional units enhance Li+ transport in acrylate-based polymer electrolytes for lithium metal batteries" . | NANO ENERGY 129 (2024) . |
| APA | Ding, Peipei , Zhao, Shu , Lin, Zhiyuan , Wu, Lingqiao , Xu, Ligang , Liu, Shiqi et al. Local fluorinated functional units enhance Li+ transport in acrylate-based polymer electrolytes for lithium metal batteries . | NANO ENERGY , 2024 , 129 . |
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Abstract ：
With the increasing demand for high energy density (>400 Wh kg-1) of lithium-ion batteries (LIBs), the higher demand for electrolytes is put forward to meet the performance of high voltage, fast charge, wide temperature, and low flammability. However, ethylene carbonate (EC) with low melting point and flammability in the commercial electrolyte will suffer a series of side reactions such as nucleophilic, dehydrogenation, and ring-opening at the cathode interphase at a voltage of >4.3 V, forming an organic-rich unstable interphase at the electrodes, which cannot match the current high energy density battery. To address this bottleneck, researchers have developed a series of EC-free electrolyte systems. The oxidation resistance of the electrolyte itself, the solvation structure, and the stable, in situ formed electrode/electrolyte interphase play a crucial role in the performance of high energy density lithium batteries, such as fast charge, wide temperature, high safety, and long cycle life. In this review, the development history, latest progress, scientific challenges, design strategies, and action mechanisms of EC-free electrolytes are comprehensively and systematically summarized. Finally, the most promising EC-free electrolyte design scheme is proposed to stimulate the wide application of next-generation lithium-ion batteries with high energy density.
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| GB/T 7714 | Xu, Congyu , Liang, Yuan , Zhang, Ruochen et al. Ethylene Carbonate-Free Electrolytes for High Voltage Lithium-Ion Batteries: Progress and Perspectives [J]. | ENERGY & FUELS , 2024 , 38 (19) : 18208-18226 . |
| MLA | Xu, Congyu et al. "Ethylene Carbonate-Free Electrolytes for High Voltage Lithium-Ion Batteries: Progress and Perspectives" . | ENERGY & FUELS 38 . 19 (2024) : 18208-18226 . |
| APA | Xu, Congyu , Liang, Yuan , Zhang, Ruochen , Cheng, Jianghan , Yu, Haijun . Ethylene Carbonate-Free Electrolytes for High Voltage Lithium-Ion Batteries: Progress and Perspectives . | ENERGY & FUELS , 2024 , 38 (19) , 18208-18226 . |
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Abstract ：
The state-of-the-art layered oxide as the cathode material for lithium-ion batteries has attracted wide attention; however, harsh operations of high-energy and high-safety energy-storage technology at high temperature is challenging owing to the aggravated structural instability and parasitic reactions at the cathodes. Herein, the layered/olivine composite structure architecture is designed at the grain surface to govern constant electrochemistry in a harsh environment, and a gradient LiF interlayer is developed onto the cathodes to suppress the interfacial degradation. By a combination of interfacial-sensitive characterizations and theoretical analysis at the cathode/interface, the formation mechanism of this special interphase induced by the composite structure cathode is revealed. The composite structure cathode could deliver an excellent high-temperature cycling stability with 90.8% retention for 300 cycles in the half cell and 95.6% retention for 1000 cycles in the pouch cell and simultaneously enhances similar to 51% of the thermal stability, which broadens the approaches for developing high-stable cathodes that work in extreme environments.
Keyword ：
layered/olivine structure layered/olivine structure lithium-ion battery lithium-ion battery interfacialstability interfacialstability gradient interface gradient interface composite structure composite structure
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| GB/T 7714 | Tian, Shaoze , Liu, Shiqi , Du, Haozhe et al. Layered/Olivine Composite Structure-Induced Stable Gradient Interfacial Chemistry toward High-Temperature Lithium-Ion Batteries [J]. | ACS NANO , 2024 , 18 (46) : 32065-32076 . |
| MLA | Tian, Shaoze et al. "Layered/Olivine Composite Structure-Induced Stable Gradient Interfacial Chemistry toward High-Temperature Lithium-Ion Batteries" . | ACS NANO 18 . 46 (2024) : 32065-32076 . |
| APA | Tian, Shaoze , Liu, Shiqi , Du, Haozhe , Zhang, Runke , Wang, Yulong , Ding, Peipei et al. Layered/Olivine Composite Structure-Induced Stable Gradient Interfacial Chemistry toward High-Temperature Lithium-Ion Batteries . | ACS NANO , 2024 , 18 (46) , 32065-32076 . |
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Abstract ：
Solid-state Li metal batteries (SSLMBs) are widely investigated since they possess promising energy density and high safety. However, the poor interfacial compatibility between the electrolyte and electrodes limits their promising development. Herein, a robust composite electrolyte (poly(vinyl ethylene carbonate) electrolyte with 3 wt % of BaTiO3, PVEC-3BTO) with excellent interfacial performance is rationally designed by incorporating ferroelectric BaTiO3 (BTO) nanoparticles into the poly(vinyl ethylene carbonate) (PVEC) electrolyte matrix. Benefiting from the high dielectric constant and ferroelectric properties of BTO, the interfacial compatibility between electrolytes and electrodes was significantly improved. The enhanced Li+ transference number (0.64) of solid electrolyte and in situ generated BaF2 inorganic interphase contribute to the enhanced cycling stability of PVEC-3BTO based Li//Li symmetrical batteries. Furthermore, the antioxidation ability of PVEC-3BTO has also been enhanced by modulating the local electric field for good pairing with high-voltage LiCoO2 material. Therefore, in this work, the mechanism of BTO for improving interfacial compatibility is revealed, and also useful methods for addressing the interface issues of SSLMBs have been provided.
Keyword ：
local electric field local electric field interfacial compatibility interfacial compatibility Li metal battery Li metal battery composite solid-state electrolyte composite solid-state electrolyte ferroelectric BaTiO3 ferroelectric BaTiO3
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| GB/T 7714 | Wu, Lingqiao , Lv, Haoran , Zhang, Rui et al. Ferroelectric BaTiO3 Regulating the Local Electric Field for Interfacial Stability in Solid-State Lithium Metal Batteries [J]. | ACS NANO , 2024 , 18 (7) : 5498-5509 . |
| MLA | Wu, Lingqiao et al. "Ferroelectric BaTiO3 Regulating the Local Electric Field for Interfacial Stability in Solid-State Lithium Metal Batteries" . | ACS NANO 18 . 7 (2024) : 5498-5509 . |
| APA | Wu, Lingqiao , Lv, Haoran , Zhang, Rui , Ding, Peipei , Tang, Mingxue , Liu, Shiqi et al. Ferroelectric BaTiO3 Regulating the Local Electric Field for Interfacial Stability in Solid-State Lithium Metal Batteries . | ACS NANO , 2024 , 18 (7) , 5498-5509 . |
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Abstract ：
Polymer electrolyte-based solid-state lithium batteries (SSLBs) with lithium-rich layered oxide (LLO) cathode materials can provide high energy density and safety. However, the development of these batteries is hindered by the poor anti-oxidation ability of polymer electrolytes. Herein, a propanesultone-based polymer electrolyte (PPS-PE) is designed, and a wide electrochemical stability window (& SIM;5.0 V vs. Li+/Li) and high ion transference number (& SIM;0.78) at 25 & DEG;C can be achieved. The strong anti-oxidation ability of PPS-PE is contributed by the design of the chain-like molecular structure, and the hydrogen bond interactions are beneficial for inhibiting the anion movement of Li salt. The PPS-PE-based SSLBs with LLO cathode materials show characteristic charge/discharge profiles with a high initial discharge capacity of & SIM;270 mA h g-1 and good cycling stability at 25 & DEG;C. Therefore, this work not only reports a novel polymer electrolyte to couple with high-voltage cathodes but also promotes the application of LLO cathode materials in high-energy SSLBs. A propanesultone-based polymer electrolyte with high ion transference number of & SIM;0.78 and wide electrochemical stability window of & SIM;5.0 V has been designed for solid-state lithium batteries with lithium-rich layered oxide cathode materials.
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| GB/T 7714 | Yin, Xin , Zhao, Shu , Lin, Zhiyuan et al. A propanesultone-based polymer electrolyte for high-energy solid-state lithium batteries with lithium-rich layered oxides [J]. | JOURNAL OF MATERIALS CHEMISTRY A , 2023 , 11 (35) : 19118-19127 . |
| MLA | Yin, Xin et al. "A propanesultone-based polymer electrolyte for high-energy solid-state lithium batteries with lithium-rich layered oxides" . | JOURNAL OF MATERIALS CHEMISTRY A 11 . 35 (2023) : 19118-19127 . |
| APA | Yin, Xin , Zhao, Shu , Lin, Zhiyuan , Guo, Xianwei , Lou, Chenjie , Liu, Shiqi et al. A propanesultone-based polymer electrolyte for high-energy solid-state lithium batteries with lithium-rich layered oxides . | JOURNAL OF MATERIALS CHEMISTRY A , 2023 , 11 (35) , 19118-19127 . |
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Abstract ：
Controllable anionic redox for a transformational increase in the energy density is the pursuit of next generation Li-ion battery cathode materials. Its activation mechanism is coupled with the local coordination environment around O, which posts experimental challenges for control. Here, the tuning capability of anionic redox is shown by varying O local environment via experimentally controlling the density of stacking faults in Li2MnO3, the parent compound of Li-rich oxides. By combining computational analysis and spectroscopic study, it is quantitatively revealed that more stacking faults can trigger smaller Li-O-Li bond angles and larger Li-O bond distance in local Li-rich environments and subsequently activate oxygen redox reactivity, which in turn enhances the reactivity of Mn upon the following reduction process. This study highlights the critical role of local structure environment in tuning the anionic reactivity, which provides guidance in designing high-capacity layered cathodes by appropriately adjusting stacking faults.
Keyword ：
Li-O-Li bond angles Li-O-Li bond angles oxygen anion activities oxygen anion activities stacking faults stacking faults Li-ion batteries Li-ion batteries Li2MnO3 Li2MnO3
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| GB/T 7714 | Wang, Boya , Zhuo, Zengqing , Li, Haifeng et al. Stacking Faults Inducing Oxygen Anion Activities in Li2MnO3 [J]. | ADVANCED MATERIALS , 2023 , 35 (22) . |
| MLA | Wang, Boya et al. "Stacking Faults Inducing Oxygen Anion Activities in Li2MnO3" . | ADVANCED MATERIALS 35 . 22 (2023) . |
| APA | Wang, Boya , Zhuo, Zengqing , Li, Haifeng , Liu, Shiqi , Zhao, Shu , Zhang, Xu et al. Stacking Faults Inducing Oxygen Anion Activities in Li2MnO3 . | ADVANCED MATERIALS , 2023 , 35 (22) . |
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Abstract ：
Layered Mn-based oxides are promising candidates for next-generation high-energy-density cathodes of rechargeable batteries owing to their prominent energy density and cost-effectiveness. However, the obvious structural degradation such as the layered-to-spinel transformation, associating with deteriorated electrochemical cycle stability, hinder their extensive applications in batteries. Herein, a composite structure is designed based on a Mn-based oxide of LiMn0.8Ni0.2O2 with a high-voltage spinel crystal domain pre-introduced into the parent layered structure, showing good structural stability during electrochemical process. Results show that Li2MnO3 crystal domain suffers from sluggish Li+ ions kinetics and structural transformation from layered to metastable spinel, while the pre-introduced high-voltage spinel crystal domain exhibits almost maintained structure, and the optimal performance near to theoretical capacity of LiMn0.8Ni0.2O2 cathode can be harvested after electrochemical activation. This design is useful for stabilizing the entire structure prior to the degradation of the parent structures, and the electrochemical contributions of layered Li2MnO3 and pre-introduced high-voltage spinel crystal domains are also discerned. This study provides new guidelines for designing high-performance composite-structure Mn-based cathode materials by pre-introduction of stable crystal domains.
Keyword ：
pre-introduced high-voltage spinel pre-introduced high-voltage spinel Mn-based cathodes Mn-based cathodes lithium-ion batteries lithium-ion batteries Li2MnO3 Li2MnO3 composite structures composite structures
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| GB/T 7714 | Liu, Shiqi , Xiao, Dongdong , Wang, Boya et al. High-Voltage Spinel and Li2MnO3 Composite Structure Construction in LiMn0.8Ni0.2O2 for Manganese-Based Lithium-Ion Battery Cathode Materials [J]. | ADVANCED ENERGY MATERIALS , 2023 , 13 (19) . |
| MLA | Liu, Shiqi et al. "High-Voltage Spinel and Li2MnO3 Composite Structure Construction in LiMn0.8Ni0.2O2 for Manganese-Based Lithium-Ion Battery Cathode Materials" . | ADVANCED ENERGY MATERIALS 13 . 19 (2023) . |
| APA | Liu, Shiqi , Xiao, Dongdong , Wang, Boya , Wang, Lihang , Wu, Tianhao , Wang, Yinzhong et al. High-Voltage Spinel and Li2MnO3 Composite Structure Construction in LiMn0.8Ni0.2O2 for Manganese-Based Lithium-Ion Battery Cathode Materials . | ADVANCED ENERGY MATERIALS , 2023 , 13 (19) . |
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Abstract ：
Poly(ethylene oxide) has been widely investigated as a potential separator for solid-state lithium metal batteries. However, its applications were significantly restricted by low ionic conductivity and a narrow electrochemical stability window (<4.0 V vs Li/Li+) at room temperature. Herein, a novel molecular self-assembled ether-based polyrotaxane electrolyte was designed using different functional units and prepared by threading cyclic 18-crown ether-6 (18C6) to linear poly(ethylene glycol) (PEG) via intermolecular hydrogen bond and terminating with hexamethylene diisocyanate trimer (HDIt), which was strongly confirmed by local structure-sensitive solid/liquid-state nuclear magnetic resonance (NMR) techniques. The designed electrolyte has shown an obviously increased room-temperature ionic conductivity of 3.48 x 10-4 S cm-1 compared to 1.12 x 10-5 S cm-1 without assembling polyrotaxane functional units, contributing to the enhanced cycling stability of batteries with both LiFePO4 and LiNi0.8Co0.15Al0.05O2 cathode materials. This advanced molecular self-assembled strategy provides a new paradigm in designing solid polymer electrolytes with demanded performance for lithium metal batteries.
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| GB/T 7714 | Ding, Peipei , Wu, Lingqiao , Lin, Zhiyuan et al. Molecular Self-Assembled Ether-Based Polyrotaxane Solid Electrolyte for Lithium Metal Batteries [J]. | JOURNAL OF THE AMERICAN CHEMICAL SOCIETY , 2023 . |
| MLA | Ding, Peipei et al. "Molecular Self-Assembled Ether-Based Polyrotaxane Solid Electrolyte for Lithium Metal Batteries" . | JOURNAL OF THE AMERICAN CHEMICAL SOCIETY (2023) . |
| APA | Ding, Peipei , Wu, Lingqiao , Lin, Zhiyuan , Lou, Chenjie , Tang, Mingxue , Guo, Xianwei et al. Molecular Self-Assembled Ether-Based Polyrotaxane Solid Electrolyte for Lithium Metal Batteries . | JOURNAL OF THE AMERICAN CHEMICAL SOCIETY , 2023 . |
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Abstract ：
The rapid expansion of renewable energies asks for great progress of energy-storage technologies for sustainable energy supplies, which raises the compelling demand of high-performance rechargeable batteries. To satisfy the huge demand from the coming energy-storage market, the resource and cost-effectiveness of rechargeable batteries become more and more important. Manganese (Mn) as a key transition element with advantages including high abundance, low cost, and low toxicity derives various kinds (spinels, layered oxides, polyanions, Prussian blue analogs, etc.) of high-performance Mn-based electrode materials, especially cathodes, for rechargeable batteries ranging from Li-ion batteries, Na-ion batteries, aqueous batteries, to multivalent metal-ion batteries. It is anticipated that Mn-based materials with Mn as the major transition-metal element will constitute a flourishing family of Mn-based rechargeable batteries (MnRBs) for large-scale and differentiated energy-storage applications. On the other hand, several critical issues including Jahn-Teller effect, Mn dissolution, and O release greatly hinder the pace of MnRBs, which require extensive material optimizations and battery/system improvements. This review aims to provide an investigation about Mn-based materials and batteries for the coming energy-storage demands, with compelling issues and challenges that must be overcome.
Keyword ：
manganese manganese energy storage energy storage Mn-based rechargeable batteries Mn-based rechargeable batteries cathode materials cathode materials
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| GB/T 7714 | Zhang, Xu , Liu, Shiqi , Wang, Boya et al. Mn-based cathode materials for rechargeable batteries [J]. | SCIENCE CHINA-CHEMISTRY , 2023 , 67 (1) : 87-105 . |
| MLA | Zhang, Xu et al. "Mn-based cathode materials for rechargeable batteries" . | SCIENCE CHINA-CHEMISTRY 67 . 1 (2023) : 87-105 . |
| APA | Zhang, Xu , Liu, Shiqi , Wang, Boya , Wang, Guoqing , Du, Haozhe , Wang, Xuanyu et al. Mn-based cathode materials for rechargeable batteries . | SCIENCE CHINA-CHEMISTRY , 2023 , 67 (1) , 87-105 . |
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