阳极
材料科学
千分尺
复合数
硅
多孔性
锂(药物)
碳纤维
电化学
电极
电池(电)
化学工程
锂离子电池
多孔硅
纳米技术
电导率
复合材料
光电子学
化学
内分泌学
物理化学
功率(物理)
工程类
物理
光学
医学
量子力学
作者
Haiping Su,Xinrui Li,Changwei Liu,Yazhuo Shang,Honglai Liu
标识
DOI:10.1016/j.cej.2022.138394
摘要
Although silicon is considered as one of the most promising anode materials, challenges related to the huge volume expansion, low conductivity, as well as tedious synthesis process hinder the practical applications. Herein, a micrometer-sized porous silicon/carbon composite (M-pSi@C) is synthesized via a spray drying process and magnesiothermic reduction method. The spherical M-pSi@C composite exhibits high porosity with rich interconnected channels under the protecting carbon shell, which can not only alleviate the volume expansion but also improve the electrode conductivity. The M-pSi@C electrode has demonstrated excellent electrochemical stability and rate performance, delivering a reversible capacity of 1702 mAh g−1 after 250 cycles at 1 A/g, and a high capacity of 1002 mAh g−1 after 500 cycles at 2 A/g with a capacity retention of 95%. This scalable preparation of micrometer-sized Si/C anode offers great potentials for next-generation lithium ion batteries.
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