Chemical Coupled PEDOT:PSS/Si Electrode: Suppressed Electrolyte Consumption Enables Long-Term Stability

Nano-Micro Letters

Xuefeng Qian¹  Nazakat Ali¹  Xuejiao Liu¹  Jiantao Zai¹  Ming Chen¹  Rongrong Qi¹  Zhixin Xu¹  Asma Iqbal¹  CheeTongJohn Low² 

[1] School of Chemistry and Chemical Engineering and State Key Laboratory of Metal Matrix Composites, Shanghai Electrochemical Energy Devices Research Center, Shanghai Jiao Tong University;Warwick Electrochemical Engineering Group, Energy Innovation Centre, WMG, University of Warwick;

关键词: Conductive binder;    PEDOT:PSS;    Cross-link;    XPS depth analysis;    Stable SEI;    Lithium-ion batteries;   

DOI  :  10.1007/s40820-020-00564-5

来源: DOAJ

【 摘 要 】

Abstract Huge volume changes of Si during lithiation/delithiation lead to regeneration of solid-electrolyte interphase (SEI) and consume electrolyte. In this article, γ-glycidoxypropyl trimethoxysilane (GOPS) was incorporated in Si/PEDOT:PSS electrodes to construct a flexible and conductive artificial SEI, effectively suppressing the consumption of electrolyte. The optimized electrode can maintain 1000 mAh g−1 for nearly 800 cycles under limited electrolyte compared with 40 cycles of the electrodes without GOPS. Also, the optimized electrode exhibits excellent rate capability. The use of GOPS greatly improves the interface compatibility between Si and PEDOT:PSS. XPS Ar+ etching depth analysis proved that the addition of GOPS is conducive to forming a more stable SEI. A full battery assembled with NCM 523 cathode delivers a high energy density of 520 Wh kg−1, offering good stability.

【 授权许可】

Unknown