Salt-Concentrated Electrolyte Constructing High Elasticity Modulus Interphase for Li-Rich Layered Oxide Cathode

IF 5.4 2区医学 Q2 MATERIALS SCIENCE, BIOMATERIALS

ACS Biomaterials Science & Engineering Pub Date : 2024-11-13 DOI:10.1021/acsami.4c10787

Zhijie Han, Yuan Liang, Shu Zhao, Qianwen Zhu, Jingteng Zhao, Errui Wang, Shiqi Liu, Boya Wang, Congyu Xu, Bing Yu, Haijun Yu

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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.

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为富锂层状氧化物阴极构建高弹性模量间相的盐浓度电解质

基于富锂层状氧化物（LLOs）的锂离子电池迫切需要稳定的电解液，而这种电池在高达 4.8 V 的高压下通常会出现容量和电压快速衰减的问题。在此，我们报告了一种由 4 M 六氟磷酸锂（LiPF6）盐在氟乙烯碳酸酯（FEC）和碳酸二甲酯（DMC）酯溶剂中组成的盐浓缩电解液，以缓解上述挑战。与 1 M 电解液相比，4 M 电解液中的溶剂结构显示出与 Li+ 结合在一起的 DMC 更易挥发，而具有抗氧化作用的 FEC 更易游离，从而拓宽了工作电压。同时，这种电解液在 LLOs 表面形成了一层薄而弹性模量高的富含 LiF 的夹层，可有效防止多种副反应和过渡金属迁移，从而提高了电化学性能，其电压衰减仅为 0.46 mV/周期，500 个周期后的容量保持率为 80.3%。这种简单有效的方法促进了使用 LLOs 的高能量密度电池的发展。

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来源期刊

ACS Biomaterials Science & Engineering Materials Science-Biomaterials

CiteScore

10.30

自引率

3.40%

发文量

413

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