材料科学
硅
阳极
锂(药物)
煅烧
无定形固体
碳纤维
多孔性
化学工程
非晶硅
电流密度
纳米技术
离子
复合材料
光电子学
晶体硅
化学
复合数
电极
催化作用
结晶学
内分泌学
物理化学
工程类
物理
有机化学
医学
量子力学
生物化学
作者
Huimin Wu,Peibo Gao,Jinglin Mu,Zhichao Miao,Pengfei Zhou,Tong Zhou,Jin Zhou
标识
DOI:10.1016/j.cclet.2021.10.039
摘要
Silicon (Si) is regarded as the potential anode for lithium-ion batteries (LIBs), due to the remarkable theoretical specific capacity and low voltage plateau. However, the rapid capacity decay resulting from volume variation and slow electron/ion transportation of Si limit its practical application. Here, matryoshka-type carbon-stabilized hollow silicon spheres (Si/C/Si/C) are synthesized by an aluminothermic reduction and calcination process. The Si/C/Si/C anode materials prepared at 500 °C (Si/C/Si/C-500) exhibit unique structures, in which amorphous region and porous structure are preserved in the Si layers. The anode based on Si/C/Si/C-500 displays an initial specific capacity of 2792 mAh/g at a current density of 100 mA/g. At 1000 mA/g, this anode retains a reversible capacity of 1673 mAh/g, 86.9% of the initial capacity after 200 cycles. Such synthetic strategy can be employed to fabricate other high-capacity anode materials with large volume variation during charge/discharge process
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