Revealing the key role of non-solvating diluents for fast-charging and low temperature Li-ion batteries  

作　　者：Yuping Zhang Siyin Li Junkai Shi Jiawei Lai Ziyue Zhuang Jingwen Liu Wenming Yang Liang Ma Yue-Peng Cai Jijian Xu Qifeng Zheng 

机构地区：[1]School of Chemistry,Guangzhou Key Laboratory of Materials for Energy Conversion and Storage,South China Normal University,Guangzhou 510006,Guangdong,China [2]Guangzhou Foreign Language School,Guangzhou 511455,Guangdong,China [3]Department of Chemistry,City University of Hong Kong,Hong Kong 999077,China

出　　处：《Journal of Energy Chemistry》2024年第7期171-180,共10页能源化学（英文版）

基　　金：supported by the National Natural Science Foundation of China (No.92372123);the Natural Science Foundation of Guangdong Province (No.2022B1515020005);the Department of Science and Technology of Guangdong Province (No.2020B0101030005)

摘　　要：Fast-charging and low temperature operation are of vital importance for the further development of lithium-ion batteries(LIBs),which is hindered by the utilization of conventional carbonate-based electrolytes due to their slow kinetics,narrow operating temperature and voltage range.Herein,an acetonitrile(AN)-based localized high-concentration electrolyte(LHCE)is proposed to retain liquid state and high ionic conductivity at ultra-low temperatures while possessing high oxidation stability.We originally reveal the excellent thermal shielding effect of non-solvating diluent to prevent the aggregation of Li^(+) solvates as temperature drops,maintaining the merits of fast Li transport and facile desolvation as at room temperature,which bestows the graphite electrode with remarkable low temperature performance(264 mA h g^(-1) at-20 C).Remarkably,an extremely high capacity retention of 97%is achieved for high-voltage high-energy graphite||NCM batteries after 250 cycles at-20 C,and a high capacity of 110 mA h g^(-1)(71%of its room-temperature capacity)is retained at-30°C.The study unveils the key role of the non-solvating diluents and provides instructive guidance in designing electrolytes towards fast-charging and low temperature LIBs.

关 键 词：Li-ion battery Fast-charging Low temperature Non-solvating diluent Shielding effect 

分 类 号：TM912[电气工程—电力电子与电力传动]