Rapid operando gas monitor for commercial lithium ion batteries: Gas evolution and relation with electrode materials  

作　　者：Siqi Lyu Na Li Lei Sun Shuqiang Jiao Haosen Chen Wei-Li Song 

机构地区：[1]Institute of Advanced Structure Technology.Bejing Institute of Technology.Bejing 100081,China [2]School ofifomation and Eletronics,Beijing nstute of Technology.Bejing 100081,China [3]StateKey Laboratory of Advanced Metalurgy University of Science and Technology Bejing,Bejing 100083,China

出　　处：《Journal of Energy Chemistry》2022年第9期14-25,I0002,共13页能源化学（英文版）

基　　金：supported by the National Key R&D Program of China(Grant No.2021YFB2401900);the National Natural Science Foundation of China(Grant Nos.11672341,11572002,52074036);the Technology Innovation Program of Beijing Institute of Technology(Grant No.2019CX01021);the BIT Teli Young Fellow。

摘　　要：Internal gases caused by side reactions are crucial signals for evaluating health and safety states of Li-ion batteries(LIBs)while it is still a great challenge to timely realize accurate monitoring.To address the issues of implanting various gas sensors into commercial batteries,here a novel method is developed to fast operando monitoring gas evolution via equipping non-dispersive infrared multi-gases sensors into a sealed tank,where real commercial batteries with one open end could be settled for operating.The generated CO_(2)concentration is strongly linked with both voltage and temperature,while the concentrations of CH_(4) and C_(2)H_(4) are solely dependent on temperature.As a typical trace gas,evolution behaviors of CO_(2)have been related to 0_(2) generation from LiNi_(o.5)Mn_(0.3)CoO_(2)0_(2) positive electrode,implying stable CO_(2)release below a critical voltage of 4.5 V.By tracking CO_(2)concentration,an increased amount of Li_(2)CO_(3) was monitored on the surface of graphite negative electrode during discharge process at dfferent temperatures and cutoff voltages,which contributes to the component variation of solid electrolyte interfaces.Such operando techniques promise a plaform for well understanding the interaction of side reactions linked with gas evolution between positive and negative electrodes in commercial LIBs.

关 键 词：Operando monitoring CO_(2)evolution Fast response Li-ion batteries 

分 类 号：TM912[电气工程—电力电子与电力传动] O646[理学—物理化学] TP212[理学—化学]