Guo Kanglong, Qi Shihan, Wang Huaping, Huang Junda, Wu Mingguang, Yang Yulu, Li Xiu, Ren Yurong, Ma Jianmin
School of Materials and Energy University of Electronic Science and Technology of China Chengdu Sichuan 611731 China.
School of Physics and Electronics Hunan University Changsha 410082 Hunan China.
Small Sci. 2022 Feb 18;2(5):2100107. doi: 10.1002/smsc.202100107. eCollection 2022 May.
Lithium batteries are currently the most popular and promising energy storage system, but the current lithium battery technology can no longer meet people's demand for high energy density devices. Increasing the charge cutoff voltage of a lithium battery can greatly increase its energy density. However, as the voltage increases, a series of unfavorable factors emerges in the system, causing the rapid failure of lithium batteries. To overcome these problems and extend the life of high-voltage lithium batteries, electrolyte modification strategies have been widely adopted. Under this content, this review first introduces the degradation mechanism of lithium batteries under high cutoff voltage, and then presents an overview of the recent progress in the modification of high-voltage lithium batteries using electrolyte modification strategies. Finally, the future direction of high-voltage lithium battery electrolytes is also proposed.
锂电池是目前最流行且最具前景的储能系统,但当前的锂电池技术已无法满足人们对高能量密度设备的需求。提高锂电池的充电截止电压可大幅提升其能量密度。然而,随着电压升高,系统中会出现一系列不利因素,导致锂电池迅速失效。为克服这些问题并延长高压锂电池的寿命,电解质改性策略已被广泛采用。在此背景下,本综述首先介绍了锂电池在高截止电压下的降解机制,然后概述了采用电解质改性策略对高压锂电池进行改性的近期进展。最后,还提出了高压锂电池电解质的未来发展方向。