Liu Xuejiao, Xu Zhixin, Iqbal Asma, Chen Ming, Ali Nazakat, Low CheeTongJohn, Qi Rongrong, Zai Jiantao, Qian Xuefeng
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.
Warwick Electrochemical Engineering Group, Energy Innovation Centre, WMG, University of Warwick, Coventry, CV4 7AL, UK.
Nanomicro Lett. 2021 Jan 8;13(1):54. doi: 10.1007/s40820-020-00564-5.
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 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, offering good stability.
硅在锂化/脱锂过程中的巨大体积变化会导致固体电解质界面（SEI）的再生并消耗电解质。在本文中，将γ-缩水甘油氧基丙基三甲氧基硅烷（GOPS）引入硅/聚（3,4-乙撑二氧噻吩）：聚苯乙烯磺酸盐（Si/PEDOT:PSS）电极中，以构建柔性导电人工SEI，有效抑制电解质的消耗。与不含GOPS的电极的40个循环相比，优化后的电极在有限电解质条件下可在近800个循环中保持1000 mAh g的容量。此外，优化后的电极表现出优异的倍率性能。GOPS的使用大大改善了硅与PEDOT:PSS之间的界面相容性。X射线光电子能谱（XPS）氩蚀刻深度分析证明，添加GOPS有利于形成更稳定的SEI。采用NCM 523正极组装的全电池具有520 Wh kg的高能量密度，稳定性良好。
