阳极
复合数
动力学
电池(电)
锂(药物)
材料科学
化学工程
多孔性
多孔硅
硅
离子
碳纤维
锂离子电池
无机化学
电极
化学
复合材料
物理化学
光电子学
有机化学
医学
功率(物理)
物理
量子力学
工程类
内分泌学
作者
Haofeng Shi,Chengdeng Wang,Jiashuai Wang,Donghua Wang,Zhihao Xiong,Zhaokun Wang,Zhi Wang,Zhiming Bai,Yan Gao,Xiaoqin Cheng
标识
DOI:10.1016/j.jcis.2024.04.174
摘要
Developing high-performance composites with fast charging and superior cycle life is paramount for lithium-ion batteries (LIBs). Herein, we synthesized a double-shell carbon-coated porous structure composite with a compact surface (P-Si@rGO@C) using low-cost commercial micron-sized silicon (Si) instead of nanoscale silicon. Results reveal that the unique P-Si@rGO@C features high adaptability to volume expansion, accelerates electron/ion transmission rate, and forms a stable solid electrolyte interphase (SEI) film. This phenomenon arises from the synergistic effect of abundant internal voids and an external double-layer carbon shell with a dense surface. Specifically, the P-Si@rGO@C anode exhibits a high initial coulombic efficiency (ICE) (88.0 %), impressive rate-capability (612.1 mAh/g at 2C), and exceptional long-term cyclability (972.2 mAh/g over 500 cycles at 0.5C). Further kinetic studies elucidate the diffusion-capacitance hybrid energy storage mechanism and reveal an improved Li
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