首页|Eliminating H2O/HF and regulating interphase with bifunctional tolylene-2,4-diisocyanate(TDI)additive for long life Li-ion battery

Eliminating H2O/HF and regulating interphase with bifunctional tolylene-2,4-diisocyanate(TDI)additive for long life Li-ion battery

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Lithium-ion batteries(LIBs)featuring a Ni-rich cathode exhibit increased specific capacity,but the estab-lishment 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/LiNi0.8Co0.1Mn0.1O2(NCM811)LIBs,herein,Tolylene-2,4-diisocyanate(TDI)additive containing lone-pair electrons is employed to formulate a novel bifunctional electrolyte aimed at eliminating H2O/HF generated at ele-vated 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 elec-trolyte has a lower capacity retention of only 78％.Furthermore,after undergoing 550 cycles at 1 C under 45 ℃,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 H2O and HF,which leads to the formation of a thin and dense interphase.The existence of this interphase is thought to substan-tially enhance the cycling performance of the LIBs.This work not only improves the performance of gra-phite/NCM811 batteries at room temperature and high temperature by eliminating H2O/HF but also presents a novel strategy for advancing functional electrolyte development.

Graphite/LiNi0.8Co0.iMn0.1O2 batteryTolylene-24-diisocyanateLong-cycling performanceH2O/HF eliminated additive

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

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School of Chemistry,South China Normal University,Guangzhou 510006,Guangdong,China

Guangzhou Tinci Materials Technology Co.Ltd.,Guangzhou 510760,Guangdong,China

Guangzhou Tinci Materials Technology Co.,Ltd.,Guangzhou 510760,Guangdong,China

School of Environmental Engineering and Chemistry,Luoyang Institute of Science and Technology,Luoyang 471023,Henan,China

School of Geomatic and Environmental Engineering,Henan Polytechnic Institute,Nanyang 473000,Henan,China

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Scientific and Technological Plan Projects of Guangzhou City,P.R.ChinaProject of Science and Technology Department of Henan ProvinceKey Research Programs of Higher Education Institutions of Henan Province

20210304000122210224007424B150009

2024

10.1016/j.jechem.2024.03.062

能源化学
中国科学院大连化学物理研究所 中国科学院成都有机化学研究所

能源化学

CSTPCDEI
影响因子：0.654
ISSN：2095-4956
年,卷(期)：2024.95(8)