聚丙烯酸对SiO_(x)/C电极电化学性能的影响  

Effect of polyacrylic acid on electrochemical performance of SiO_(x)/C electrode

作　　者：周烽 王小飞 张道明 漆志文[1] ZHOU Feng;WANG Xiao-fei;ZHANG Dao-ming;QI Zhi-wen(State Key Laboratory of Chemical Engineering,School of Chemical Engineering,East China University of Science and Technology,Shanghai 200237,China;State Key Laboratory of Green Chemical Engineering and Industrial Catalysis,Sinopec Shanghai Research Institute of Petrochemical Technology,Shanghai 201208,China)

机构地区：[1]华东理工大学化工学院,化学工程联合国家重点实验室,上海200237 [2]中国石化上海石油化工研究院绿色化工与工业催化国家重点实验室,上海201208

出　　处：《电池》2023年第1期43-47,共5页Battery Bimonthly

摘　　要：硅基负极在循环过程中由于较大的体积膨胀,容易导致开裂。以羧甲基纤维素(CMC)和丁苯橡胶(SBR)(质量比为1∶1)为基础黏结剂,通过电化学阻抗谱测试、SEM分析和剥离测试,研究添加聚丙烯酸(PAA)对SiO_(x)/C电极电化学性能的影响。添加适量PAA后,电极的电化学稳定性以及电极活性物质与集流体的剥离强度增强,缓解了电极在循环过程中组分的脱落。当CMC、SBR与PAA的质量比为1∶1∶1时,SiO_(x)/C电极组装的电池的循环稳定性和倍率性能均得到提升:在0.05~1.50 V充放电,与采用基础黏结剂相比,添加PAA后的电池,以0.2 C循环100次的容量保持率由67.10%提高到80.92%;2.0 C和3.0 C比容量分别提高48.17%和59.70%。Silicon-based anode electrode was prone to cracking due to large volume expansion during cycling.The carboxymethyl cellulose(CMC)combined with styrene butadiene rubber(SBR)(mass ratio of 1∶1)was used as the base binder,the effect of addition of polyacrylic acid(PAA)on the electrochemical performance of SiO_(x)/C electrode was studied by electrochemical impedance spectroscopy test,SEM analysis and peeling test.The addition of appropriate amount of PAA enhanced the electrochemical stability of the electrode and the peel strength of the electrode active material from the collector,alleviated the shedding of the components of the electrode during the cycling.When the mass ratio of CMC,SBR and PAA was 1∶1∶1,the cycle stability and rate capability of batteries assembled with SiO_(x)/C electrode were improved.When charged-discharged in 0.05-1.50 V,the capacity retention rate of batteries with PAA increased from 67.10%to 80.92%at 0.2 C after 100 cycles compared with that using the base binder.It showed a specific capacity increasing of 48.17%and 59.70%at 2.0 C and 3.0 C,respectively.

关 键 词：聚丙烯酸 黏结剂 锂离子电池 SiOx/C电极 电化学性能 

分 类 号：TM912.9[电气工程—电力电子与电力传动]