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Vol. 13 (2021)

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

https://doi.org/10.1007/s40820-020-00564-5
Xuejiao Liu
School of Chemistry and Chemical Engineering and State Key Laboratory of Metal Matrix Composites, Shanghai Electrochemical Energy Devices Research Center, Shanghai Jiao Tong University, Shanghai 200240, P. R. China
Zhixin Xu
School of Chemistry and Chemical Engineering and State Key Laboratory of Metal Matrix Composites, Shanghai Electrochemical Energy Devices Research Center, Shanghai Jiao Tong University, Shanghai 200240, P. R. China
Asma Iqbal
School of Chemistry and Chemical Engineering and State Key Laboratory of Metal Matrix Composites, Shanghai Electrochemical Energy Devices Research Center, Shanghai Jiao Tong University, Shanghai 200240, P. R. China
Ming Chen
School of Chemistry and Chemical Engineering and State Key Laboratory of Metal Matrix Composites, Shanghai Electrochemical Energy Devices Research Center, Shanghai Jiao Tong University, Shanghai 200240, P. R. China
Nazakat Ali
School of Chemistry and Chemical Engineering and State Key Laboratory of Metal Matrix Composites, Shanghai Electrochemical Energy Devices Research Center, Shanghai Jiao Tong University, Shanghai 200240, P. R. China
CheeTongJohn Low
Warwick Electrochemical Engineering Group, Energy Innovation Centre, WMG, University of Warwick, Coventry CV4 7AL, UK
Rongrong Qi
School of Chemistry and Chemical Engineering and State Key Laboratory of Metal Matrix Composites, Shanghai Electrochemical Energy Devices Research Center, Shanghai Jiao Tong University, Shanghai 200240, P. R. China
Jiantao Zai
School of Chemistry and Chemical Engineering and State Key Laboratory of Metal Matrix Composites, Shanghai Electrochemical Energy Devices Research Center, Shanghai Jiao Tong University, Shanghai 200240, P. R. China
Xuefeng Qian
School of Chemistry and Chemical Engineering and State Key Laboratory of Metal Matrix Composites, Shanghai Electrochemical Energy Devices Research Center, Shanghai Jiao Tong University, Shanghai 200240, P. R. China

Corresponding Author: Xuefeng Qian

xfqian@sjtu.edu.cn

Nano-Micro Letters, Vol. 13 (2021), Article Number: 54

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.


Highlights:


1 γ-Glycidoxypropyl trimethoxysilane (GOPS) was incorporated in Si/PEDOT:PSS electrodes to construct a flexible and conductive artificial solid-electrolyte interphase (SEI).
2 XPS Ar+ etching depth analysis proved that the addition of GOPS is conducive to forming a more stable SEI.
3 A full battery assembled with NCM 523 cathode delivers a high energy density of 520 Wh kg-1, offering good stability.

Keywords

Conductive binder PEDOT:PSS Cross-link XPS depth analysis Stable SEI Lithium-ion batteries
Liu, Xuejiao, Zhixin Xu, Asma Iqbal, Ming Chen, Nazakat Ali, CheeTongJohn Low, Rongrong Qi, Jiantao Zai, and Xuefeng Qian. 2021. “Chemical Coupled PEDOT:PSS/Si Electrode: Suppressed Electrolyte Consumption Enables Long-Term Stability”. Nano-Micro Letters 13 (January):54. https://doi.org/10.1007/s40820-020-00564-5.
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