Eliminating H_(2)O/HF and regulating interphase with bifunctional tolylene-2,4-diisocyanate(TDI)additive for long life Li-ion battery  

作　　者：Xueyi Zeng Xiang Gao Peiqi Zhou Haijia Li Xin He Weizhen Fan Chaojun Fan Tianxiang Yang Zhen Ma Xiaoyang Zhao Junmin Nan 

机构地区：[1]School of Chemistry,South China Normal University,Guangzhou 510006,Guangdong,China [2]Guangzhou Tinci Materials Technology Co.Ltd.,Guangzhou 510760,Guangdong,China [3]School of Environmental Engineering and Chemistry,Luoyang Institute of Science and Technology,Luoyang 471023,Henan,China [4]School of Geomatic and Environmental Engineering,Henan Polytechnic Institute,Nanyang 473000,Henan,China

出　　处：《Journal of Energy Chemistry》2024年第8期519-528,I0011,共11页能源化学（英文版）

基　　金：financially supported by the Scientific and Technological Plan Projects of Guangzhou City(202103040001),P.R.China;the Project of Science and Technology Department of Henan Province(222102240074);the Key Research Programs of Higher Education Institutions of Henan Province(24B150009)。

摘　　要：Lithium-ion batteries(LIBs)featuring a Ni-rich cathode exhibit increased specific capacity,but the establishment of a stable interphase through the implementation of a functional electrolyte strategy remains challenging.Especially when the battery is operated under high temperature,the trace water present in the electrolyte will accelerate the hydrolysis of the electrolyte and the resulting HF will further erode the interphase.In order to enhance the long-term cycling performance of graphite/LiNi_(0.8)Co_(0.1)Mn_(0.1)O_(2)(NCM811)LIBs,herein,Tolylene-2,4-diisocyanate(TDI)additive containing lone-pair electrons is employed to formulate a novel bifunctional electrolyte aimed at eliminating H_(2)O/HF generated at elevated temperature.After 1000 cycles at 25℃,the battery incorporating the TDI-containing electrolyte exhibits an impressive capacity retention of 94%at 1 C.In contrast,the battery utilizing the blank electrolyte has a lower capacity retention of only 78%.Furthermore,after undergoing 550 cycles at 1 C under45℃,the inclusion of TDI results in a notable enhancement of capacity,increasing it from 68%to 80%.This indicates TDI has a favorable influence on the cycling performance of LIBs,especially at elevated temperatures.The analysis of the film formation mechanism suggests that the lone pair of electrons of the isocyanate group in TDI play a crucial role in inhibiting the generation of H_(2)O and HF,which leads to the formation of a thin and dense interphase.The existence of this interphase is thought to substantially enhance the cycling performance of the LIBs.This work not only improves the performance of graphite/NCM811 batteries at room temperature and high temperature by eliminating H_(2)O/HF but also presents a novel strategy for advancing functional electrolyte development.

关 键 词：Graphite/LiNi_(0.8)Co_(0.1)Mn_(0.1)O_(2)battery Tolylene-2 4-diisocyanate Long-cycling performance H_(2)O/HF eliminated additive 

分 类 号：TM912[电气工程—电力电子与电力传动]