光沉积制备pSi@CoO_(x)高性能锂离子电池负极材料  

Photodeposition for Preparing Porous Si@CoO_(x) Composites as High-Performance Anode Material for Lithium-Ion Batteries

作　　者：龚俊捷 王建明[1] GONG Jun‑Jie;WANG Jian‑Ming(Department of Chemistry,Zhejiang University,Hangzhou 310027,China)

机构地区：[1]浙江大学化学系,杭州310027

出　　处：《无机化学学报》2021年第10期1773-1781,共9页Chinese Journal of Inorganic Chemistry

基　　金：国家自然科学基金(No.21373182)资助。

摘　　要：选用微米级商业硅铝合金粉末作为原料,采用酸刻蚀、光沉积和后续的还原过程制备了 CoOx纳米片原位包覆的多孔硅复合材料。探究了不同光沉积时间对pSi@CoO_(x)材料形貌及其储锂性能的影响。CoOx纳米片的引入有效改善了材料的导电性并提高了材料的结构稳定性,即使在1 A·g^(-1)的电流密度下循环200圈后,pSi@CoO_(x)-5的比容量仍能保持774.2 mAh·g^(-1)。In this work,micron-sized commercial Si-Al alloy powders were used as raw material to in-situ prepare porous silicon/CoOx composites by acid etching,photochemical deposition and subsequently reduction process.The effects of different photodeposition times on the morphologies and lithium storage properties of pSi@CoO_(x) materials were explored.The introduction of CoO_(x) nanosheets improves the electronic conductivity and structural stability of the composites.Even at the current density of 1 A·g^(-1),pSi@CoO_(x)-5 delivered a specific capacity of 774.2 mAh·g^(-1)after 200 cycles.

关 键 词：Si-Al合金 多孔硅 光沉积 CoOx纳米片 锂离子电池 

分 类 号：O646.21[理学—物理化学] O613.72[理学—化学]