Dimethyl trimethylsilyl phosphite as a novel electrolyte additive for high voltage layered lithium cobaltate-based lithium ion batteries,New Journal of Chemistry

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Dimethyl trimethylsilyl phosphite as a novel electrolyte additive for high voltage layered lithium cobaltate-based lithium ion batteries
New Journal of Chemistry ( IF 2.7 ) Pub Date : 2021-1-14 , DOI: 10.1039/d0nj06010k
Xing-Qun Liao _{1,

2,

3,

4,

5} , Chang-Ming Zhang _{3,

4,

5} , Feng Li _{3,

4,

5} , Zhou-Lan Yin _{1,

2,

3} , Guo-Cong Liu _{3,

6,

7} , Jin-Gang Yu _{1,

2,

3}

Affiliation

In recent years, in order to meet the increasing demand for lithium-ion batteries (LIBs) with high energy density, various positive electrode materials have been developed. The higher the Ni content is, the better the performance of the alloy electrode is and the larger its capacity is. Increasing the charging voltage can improve the capacity of the electrode material and the voltage platform performance. However, as the charging voltage increases, the stability of the interface between the positive electrode material and the electrolyte will decrease, causing an increase in side reactions, which would seriously affect the cycle performance of LIBs. Herein, dimethyl trimethylsilyl phosphite (DMTMSP) was used as an efficient multifunctional electrolyte additive for high-voltage lithium cobalt oxide (LiCoO₂). Protective films would be formed on the positive electrode and the negative electrode surface by electrochemical redox reactions, and the stability of the positive electrode material–electrolyte interface was highly improved whereas the impedance was decreased. On addition of 0.5 wt% of DMTMSP into the electrolyte, the battery exhibited outstanding low-temperature discharge and cycling performances (capacity retention remained at 82.7% at −20 °C with a rate of 0.3C and at 75% at elevated temperature even after 480 cycles).

中文翻译：

亚磷酸二甲基三甲基硅烷基酯作为高压层状钴酸锂基锂离子电池的新型电解质添加剂

近年来，为了满足对具有高能量密度的锂离子电池（LIB）的不断增长的需求，已经开发了各种正极材料。Ni含量越高，合金电极的性能越好，其容量越大。增加充电电压可以改善电极材料的容量和电压平台性能。然而，随着充电电压的增加，正极材料与电解质之间的界面的稳定性将降低，导致副反应增加，这将严重影响LIB的循环性能。在此，使用二甲基三甲基甲硅烷基亚磷酸酯（DMTMSP）作为高压钴酸锂（LiCoO ₂）。通过电化学氧化还原反应在正极和负极表面形成保护膜，正极材料-电解液界面的稳定性大大提高，而阻抗却降低了。在电解液中添加0.5 wt％的DMTMSP时，该电池表现出出色的低温放电和循环性能（在-20°C时，容量保持率保持在82.7％，以0.3C的速率保持，在高温下保持在75％，即使经过480个周期）。

更新日期：2021-01-29

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