材料科学
碳化
阳极
化学工程
锂(药物)
电化学
硅
纳米颗粒
复合数
碳纤维
试剂
纳米技术
电极
复合材料
化学
有机化学
冶金
物理化学
内分泌学
工程类
医学
扫描电子显微镜
作者
Zhuoya Ren,Shuai Liu,Jianqiang Chen,Yang Yu,Qianqian Shang,Sandile Fakudze,Chengguo Liu,Peiguo Zhou,Qiulu Chu
标识
DOI:10.1016/j.electacta.2021.139556
摘要
As the world transitions towards an electric vehicle-driven future, demand for energy storage materials has continued to grow. Silicon-carbon composites are considered one of the most promising anode materials for lithium-ion batteries owing to their superior electrochemical performance. However, their commercialization is seriously limited due to the use of chemical reagents as carbon source, unstable coating structures and the complexity of the synthesis process. Herein, a facile one-step carbonization method at 800 °C was used to prepare [email protected]X@C-800 composite by using rice husks, 1‑butyl‑3-methylimidazolium acetate (BMIMAcO) and silicon nanoparticles (Si-NPs). When the optimized [email protected]@C-800 was applied to the anode of lithium-ion batteries, it exhibited prominent reversible capacity (694 mAh g−1 at 0.1 A g−1), with remarkable rate performance (220 mAh g−1 at 2 A g−1), and excellent cyclic stability (460 mAh g−1 with a capacity retention of 105.7% at 1 A g−1 after 1000 cycles). The coupling of interfaces by Si-N bonds led to the formation of a double-layered structure which enhanced Li+ diffusion coefficients and electrochemical kinetics, while tremendously limiting the volume variation of Si nanoparticles (Si NPs). The double-shell-structured [email protected]X@C-800 composite material which was facilely synthesized using an eco-friendly approach presented superior electrochemical performance.
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