文献类型：期刊文献

英文题名：Operando pressure measurements monitor the degradation of SiOx/C anode for Li-ion cells

作者：Zhu, Yunpeng[1,2];Song, Jinhua[2];Yan, Liqin[2];Guo, Xiangfei[2];Chen, Jian[2];Zhao, Chongjun[1];Huang, Yajun[2]

机构：[1]East China Univ Sci & Technol, Sch Mat Sci & Engn, Shanghai Key Lab Adv Polymer Mat, Key Lab Ultrafine Mat,Minist Educ, Shanghai 200237, Peoples R China;[2]Shanghai Inst Space Power Sources, State Key Lab Space Power Sources, Shanghai 200245, Peoples R China

年份：2023

卷号：588

外文期刊名：JOURNAL OF POWER SOURCES

收录：;EI(收录号：20234214922480);WOS:【SCI-EXPANDED(收录号:WOS:001103983400001)】；

基金：This work was supported by Program of Shanghai Technology Research Leader [No: 20XD1430800] and the National Key R & D Pro- gram of China [No: 2022YFB2404303] .

语种：英文

外文关键词：Li-ion cells; Operando pressure; dP/dQ; SiOx/C anode; Degradation

摘要：Monitoring on the degradation of the capacity is important to ensure the normal operation of the Li-ion cells. Herein, operando pressure measurement, an in-situ and real-time non-destructive method, is developed to monitor the degradation of SiOx/C anode. Combined with the potentials of the anode and cathode, the relationship between the cell pressure change and the internal reaction in cell is firstly established. Furthermore, the differential pressure (dP/dQ) possesses the ability to quantitatively distinguish the capacity of SiOx from total capacity, due to difference in volume change between SiOx and C during discharge. And then this powerful operando pressure method is used in the cells with two different binders, Carboxy Methyl Cellulose + Poly-merized Styrene Butadiene Rubber (CMC + SBR) and Poly(Acrylic Acid)-based (PAA-based) binder, respectively. Based on the monitoring of the pressure and dP/dQ, the contribution and degradation of SiOx and C are clearly known in the cases of two binders, i.e., the capacity degradation of SiOx is only 1.7% for PAA-based binder after 500 cycles while 9.58% for CMC + SBR. Operando pressure method paves the wave for the in-situ and in real time monitoring the silicon-contained Li-ion cells.