School of Chemistry & Chemical Engineering, Shanghai Jiao Tong University, Shanghai 200240, China.
Phys Chem Chem Phys. 2013 Sep 14;15(34):14420-6. doi: 10.1039/c3cp51799c. Epub 2013 Jul 29.
The m-SiO(x)/Si composite for lithium ion battery anode was prepared via a partial reduction reaction between ball-milled silicon monoxide and magnesium by high-energy mechanical milling. The m-SiO(x)/Si is composed of Si-suboxide and embedded Si nano-crystallites. The particles were further covered by a uniform carbon layer on the surface via a chemical vapor deposition process. The m-SiO(x)/Si/C composite shows a stable reversible capacity of ca. 1250 mA h g(-1) and excellent cycling stability with 90.9% capacity retention on the 100th cycle versus the 6th one (compared at the same current rate). In contrast, SiO pre-milled for 25 h presents a reversible capacity of only ca. 900 mA h g(-1) under the same carbon coating condition.
锂离子电池用 m-SiO(x)/Si 复合负极材料通过高能机械球磨法使二氧化硅和镁之间发生部分还原反应制备得到。m-SiO(x)/Si 由亚氧化硅和嵌入的硅纳米晶组成。通过化学气相沉积过程，颗粒表面进一步覆盖了一层均匀的碳层。m-SiO(x)/Si/C 复合材料在 100 次循环中表现出约 1250 mA h g(-1) 的稳定可逆容量和出色的循环稳定性，与第 6 次循环相比，容量保持率为 90.9%（在相同电流速率下进行比较）。相比之下，在相同的碳涂层条件下，预磨 25 小时的 SiO 仅表现出约 900 mA h g(-1) 的可逆容量。
