材料科学
佩多:嘘
阳极
硅
电解质
复合数
磺酸
电导率
电化学
化学工程
复合材料
高分子化学
光电子学
聚合物
电极
工程类
物理化学
化学
作者
Benqiang Chen,Dongmin Xu,Simin Chai,Zhi Chang,Anqiang Pan
标识
DOI:10.1002/adfm.202401794
摘要
Abstract The application of silicon (Si) anode is limited by the drastic volume change of silicon in the lithiation/delithiation process, the repeated formation of the solid electrolyte interface (SEI), and the low intrinsic conductivity. In this work, a small amount of poly (3,4‐ethylenedioxythiophene):poly (styrene sulfonic acid) (PEDOT:PSS) (PP), citric acid (CA), isopropyl alcohol (IPA), and silicon nanoparticles (SiNPs) are mixed and vacuum treated at a specific temperature to obtain silicon‐based anode electrode composite Si@PP@CA. The interphase forms a robust elastic network with hydrogen and chemical bonds, which have good mechanical properties and self‐repairing characteristics. The modified PEDOT:PSS as the conductive medium significantly improves the charge transfer rate. Moreover, the rapid formation of SEI by CA on the surface of SiNPs enhances the structural stability of the material. The electrochemical results show that the capacity of Si@PP@CA composite electrode canretain more than 2200 mAh g −1 after 200 cycles at 0.2 A g −1 . It still shows a high capacity retention of 89% even at the current density of 1.0 A g −1 after 2000 cycles. More importantly, such excellent performance can be obtained using an electrode with an active material content of up to 90 wt%, which is essential for practical applications.
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