Citation: Xi Tang, Shihan Qi, Jian He, Jiandong Liu, Xiu Li, Jiu Lin, Abdullah N. Alodhayb, Lihua Wang, Jianmin Ma. Electrolyte additive strategy to eliminate hydrofluoric acid and construct robust cathode electrolyte interphase for 4.6 V Li||LiCoO₂ batteries[J]. Chinese Chemical Letters, ;2026, 37(2): 110622. doi: 10.1016/j.cclet.2024.110622 shu

Electrolyte additive strategy to eliminate hydrofluoric acid and construct robust cathode electrolyte interphase for 4.6 V Li||LiCoO₂ batteries

Xi Tang ^{a, 1} ,
Shihan Qi ^{a, 1} ,
Jian He ^a ,
Jiandong Liu ^a ,
Xiu Li ^{b, *,} ,
Jiu Lin ^{c, *,} ,
Abdullah N. Alodhayb ^d ,
Lihua Wang ^e ,
Jianmin Ma ^{a, *,}

a.
School of Physics and Electronics, Hunan University, Changsha 410082, China
b.
School of Electronic and Information Engineering, Tiangong University, Tianjin 300387, China
c.
Zhejiang Funlithium New Energy Technology Co., Ltd., Ningbo 315201, China
d.
Department of Physics and Astronomy, College of Science, King Saud University, Riyadh 11451, Saudi Arabia
e.
School of Energy and Electrical Engineering, Hunan Institute of Science and Technology, Yueyang 414006, China

xiuli@tiangong.edu.cn

linjiu@ganfenglithium.com

nanoelechem@hnu.edu.cn

Received Date: 3 September 2024
Revised Date: 2 October 2024
Accepted Date: 7 November 2024
Available Online: 8 November 2024

Figures(4)

The high voltage of Li||LiCoO₂ battery can increase the energy density. However, the cycling performance associated with cathode structural stability remains challenging. To address this question, we proposed an electrolyte strategy for improving the performance of 4.6 V Li||LiCoO₂ battery by using trimethylsilyl isocyanate (TMIS) as electrolyte additive. The trimethylsilyl group of TMIS can trap HF while the isocyanate group brings polyamide components to the CEI and the SEI. By the synergistic action, the Co³⁺ dissolution problem of the LiCoO₂ cathode was effectively curbed. Furthermore, TMIS regulates the construction of anion-dominated LiF-rich SEI by influencing the solvation structure of Li⁺. As expected, the 4.6 V Li||LiCoO₂ battery with TMIS retains 77.9% initial capacity after 200 cycles at 0.5 C.
- Cathode electrolyte interphase,
- High-voltage electrolyte,
- Electrolyte additive,
- Lithium metal batteries,
- Solvation structure
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通讯作者: 陈斌, bchen63@163.com

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沈阳化工大学材料科学与工程学院沈阳 110142

Electrolyte additive strategy to eliminate hydrofluoric acid and construct robust cathode electrolyte interphase for 4.6 V Li||LiCoO2 batteries

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通讯作者: 陈斌, bchen63@163.com

Electrolyte additive strategy to eliminate hydrofluoric acid and construct robust cathode electrolyte interphase for 4.6 V Li||LiCoO₂ batteries