A series of Si-Mn/C core–shell composites as anode materials is synthesized via a hydrothermal method combined with heating treatment. X-ray diffraction, Raman spectroscopy, x-ray photoelectron spectroscopy, scanning electron microscopy and transmission electron microscopy analysis are used to investigate the crystal structures and chemical compositions of all as-prepared composites. With the increase of Mn4Si7 alloy content in the Si-Mn/C composites, their cycle properties and rate capabilities increase first and then decrease. As a result, the obtained Si-Mn/C (9:1) displays the largest specific capacity of approximately 960 mAh/g after 100 cycles among all composites, and it can be sustained at 1 A/g with a reversible specific capacity of 460 mAh/g, demonstrating good electrochemical performance for Si-based anodes. Our study presents an ideal candidate to improve the mechanical integrity and electrochemical property of a Si-based anode for potential application in lithium-ion batteries.

中文翻译：

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锂离子电池用Si-Mn/C核壳复合材料的结构和电化学性能

通过水热法结合热处理合成了一系列作为负极材料的Si-Mn/C核壳复合材料。X 射线衍射、拉曼光谱、X 射线光电子能谱、扫描电子显微镜和透射电子显微镜分析用于研究所有制备的复合材料的晶体结构和化学成分。随着Si-Mn/C复合材料中Mn4Si7合金含量的增加，其循环性能和倍率性能先升高后降低。结果，获得的 Si-Mn/C (9:1) 在所有复合材料中在 100 次循环后显示出约 960 mAh/g 的最大比容量，并且它可以在 1 A/g 下保持，可逆比容量为460 mAh/g，证明了硅基负极良好的电化学性能。