材料科学
法拉第效率
一氧化硅
阳极
锂(药物)
化学工程
硅
复合数
离子
涂层
碳纤维
纳米技术
复合材料
电极
冶金
内分泌学
物理化学
化学
工程类
物理
医学
量子力学
作者
Cancan Bian,Rusheng Fu,Zhepu Shi,Jingjing Ji,Jun Zhang,Wen Chen,Xufeng Zhou,Siqi Shi,Zhaoping Liu
标识
DOI:10.1021/acsami.2c02466
摘要
Silicon monoxide (SiO) is considered as one of the most promising anode material candidates for next-generation high-energy-density lithium ion batteries (LIBs) due to its high specific capacity and relatively lower volume expansion than that of Si. However, a large number of irreversible products are formed during the first charging and discharging process, resulting in a low initial Coulombic efficiency (ICE) of SiO. Herein, we report an economical and convenient method to increase the ICE of SiO without sacrificing its specific capacity by a solid reaction between magnesium silicide (Mg2Si) and micron-sized SiO. The reaction product (named MSO) exhibits a unique core-shell structure with uniformly distributed Mg2SiO4 and Si as the shell and disproportionated SiO as the core. MSO exhibits a superior ICE and a high reversible capacity of 81.7% and 1306.1 mAh g-1, respectively, which can be further increased to 88.7% and 1446.4 mAh g-1 after carbon coating, and improved cyclic stability compared to bare SiO. This work provides a simple yet effective strategy to address the low ICE issue of SiO anode materials to promote the practical application of SiO.
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