Boosting reversible charging of Li-ion batteries at low temperatures by a synergy of propylene carbonate-based electrolyte and defective graphite  

作　　者：Yingqiang Wu Jiao Zhang Jinli Liu Li Sheng Bo Zhang Limin Wang Siqi Shi Li Wang Hong Xu Xiangming He 

机构地区：[1]Institute of Nuclear and New Energy Technology,Tsinghua University,Beijing 100084,China [2]State Key Laboratory of Rare Earth Resource Utilization,Changchun Institute of Applied Chemistry,Chinese Academy of Sciences(CAS),Changchun 130022,China [3]China National Quality Supervision and Inspection Center for Industrial Explosive Materials,Nanjing University of Science and Technology,Nanjing 210094,China [4]School of Materials Science and Engineering,Materials Genome Institute,Shanghai University,Shanghai 200444,China

出　　处：《Nano Research》2024年第3期1491-1499,共9页纳米研究（英文版）

基　　金：supported by the National Natural Science Foundation of China(Nos.22279071,22279070,52073161,and U21A20170);the Ministry of Science and Technology of the People’s Republic of China(Nos.2019YFA0705703 and 2019YFE0100200);Postdoctoral Research Foundation of China(No.2021M701873).

摘　　要：Propylene carbonate(PC)-based electrolytes have exhibited significant advantages in boosting the low-temperature discharging of graphite-based Li-ion batteries.However,it is still unclear whether they can improve the charging property and suppress lithium plating.Studying this topic is challenging due to the problem of electrochemical compatibility.To overcome this issue,we introduced graphite with phase defects.The results show that the pouch-type full batteries using PC-based electrolyte exhibit steady performance over 500 cycles and can be reversibly charged over 30 times at-20℃ with an average Coulombic efficiency of 99.95%,while the corresponding value for the conventional ethylene carbonate(EC)-based electrolyte sample is only 31.20%.This indicates that the use of PC-based electrolyte significantly suppresses lithium plating during low-temperature charging.We further demonstrate that the improved performance is mainly attributed to the unique solvation structure,where PF-6more anions participate in solvation,leading to the formation of a stable F-rich solid state electrolyte interface on the graphite surface and a lower reduction tendency of Li+ions.This work inspires new ideas for the design of PC-based electrolytes for low-temperature charging and fast-charging batteries.

关 键 词：lithium-ion batteries GRAPHITE propylene carbonate low-temperature charging 

分 类 号：TM912[电气工程—电力电子与电力传动]