Vinyltrimethylsilane as a novel electrolyte additive for improving interfacial stability of Li-rich cathode working in high voltage

Bing Jiang ¹Hao Li ¹Bi Luo ¹Lehao Liu ¹Lihua Chu ¹Qiaobao Zhang ²Meicheng Li¹

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作者信息

1. State Key Laboratory of Alternate Electrical Power System with Renewable Energy Sources,School of New Energy,North China Electric Power University,Beijing 102206,China
2. State Key Laboratory of Physical Chemistry of Solid Surfaces,College of Materials,Xiamen University,Xiamen 361005,China
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Abstract

Boosting the interfacial stability between electrolyte and Li-rich cathode material at high operating volt-age is vital important to enhance the cycling stability of Li-rich cathode materials for high-performance Li-ion batteries.In this work,vinyltrimethylsilane as a new type of organic silicon electrolyte additive is studied to address the interfacial instability of Li-rich cathode material at high operating voltage.The cells using vinyltrimethylsilane additive shows the high capacity retention of 73.9％after 300 cycles at 1 C,whereas the cells without this kind of additive only have the capacity retention of 58.9％.The im-provement of stability is mainly attributed to the additive helping to form a more stable surface film for Li-rich cathode material,thus avoiding direct contact between the electrolyte and the cathode material,slowing down the dissolution of metal ions and the decomposition of the electrolyte under high oper-ating voltage.Our findings in this work shed some light on the design of stable cycling performance of Li-rich cathode toward advanced Li-ion batteries.

Key words

Vinyltrimethylsilane/Electrolyte additive/Li-rich cathode/Interfacial stability/Capacity retention

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基金项目

State Key Laboratory of Alternate Electrical Power System with Renewable Energy Sources(LAPS21004)

State Key Laboratory of Alternate Electrical Power System with Renewable Energy Sources(LAPS202114)

国家自然科学基金(52272200)

国家自然科学基金(51972110)

国家自然科学基金(52102245)

国家自然科学基金(52072121)

北京市科技计划(Z211100004621010)

北京市自然科学基金(2222076)

北京市自然科学基金(2222077)

河北省自然科学基金(E2022502022)

Huaneng Group Headquarters Science and Technology Project(HNKJ20-H88)

Strategic Research Key Project of Science and Technology Commission of the Ministry of Education,China Postdoctoral Science Foun(2022M721129)

中央高校基本科研业务费专项(2022MS030)

中央高校基本科研业务费专项(2021MS028)

中央高校基本科研业务费专项(2020MS023)

中央高校基本科研业务费专项(2020MS028)

NCEPU"Double First-Class"Program()

State Key Laboratory of Alternate Electrical Power System with Renewable Energy Sources(LAPS22005)

出版年

2024

中国化学快报(英文版)

中国化学会

中国化学快报(英文版)

CSTPCDCSCD

影响因子：0.771

ISSN：1001-8417

参考文献量49

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