材料科学
阳极
硅
铜
集电器
多孔硅
锂(药物)
化学工程
多孔性
电极
纳米技术
复合数
电流密度
储能
电化学
复合材料
光电子学
冶金
电解质
化学
量子力学
医学
功率(物理)
物理化学
内分泌学
工程类
物理
作者
WangJiamin,ZhangZhijia,SunShihao,YuanShen,LiWeijie,QiaoZhijun,YuZhenyang,KangJianli
出处
期刊:Surface Innovations
日期:2021-08-01
卷期号:9 (4): 207-213
被引量:9
标识
DOI:10.1680/jsuin.20.00055
摘要
Silicon (Si) possesses high theoretical lithium-ion (Li + )-storage capability but is still limited to a huge volume change in the charging–discharging process and has poor conductivity, which hinders its application. Here, the authors report a novel three-dimensional (3D) continuous porous silicon/copper (Cu) composite film through non-solvent-induced phase separation and heat treatment. The composite film inherits the developed 3D channels of copper with a proper pore size (1–5 μm), while the silicon particles can evenly adhere onto the 3D copper current collector tightly by heat treatment. It provides a reversible capacity of up to 2054.9 mAh/g after 150 cycles under a current of 0.05 C and exhibits a good rate capability (609.9 mAh/g at a high rate of 1 C) when used as an electrode. Naturally, the 3D porous architecture could not only shorten the electron/ion transmission path but also induce space-confined silicon, which provides a stable space for the volume expansion/contraction of silicon to restrict pulverization. This strategy provides ideas for the development of high-energy-density electrodes for next-generation energy-storage systems.
科研通智能强力驱动
Strongly Powered by AbleSci AI