Key Laboratory of Colloid and Interface Chemistry Ministry of Education, School of Chemistry and Chemical Engineering, Shandong University, Jinan, 250100, P. R. China.
Angew Chem Int Ed Engl. 2016 Nov 2;55(45):14063-14066. doi: 10.1002/anie.201608146. Epub 2016 Oct 6.
Amorphous Si (a-Si) shows potential advantages over crystalline Si (c-Si) in lithium-ion batteries, owing to its high lithiation potential and good tolerance to intrinsic strain/stress. Herein, porous a-Si has been synthesized by a simple process, without the uses of dangerous or expensive reagents, sophisticated equipment, and strong acids that potential cause environment risks. These porous a-Si particles exhibit excellent electrochemical performances, owing to their porous structure, amorphous nature, and surface modification. They deliver a capacity of 1025 mAh g at 3 A g after 700 cycles. Moreover, the reversible capacity after electrochemical activation, is quite stable throughout the cycling, resulting in a capacity retention about around 88 %. The direct comparison between a-Si and c-Si anodes clearly supports the advantages of a-Si in lithium-ion batteries.
非晶硅（a-Si）在锂离子电池中显示出优于晶体硅（c-Si）的潜在优势，因为它具有较高的嵌锂电位和对固有应变/应力的良好耐受性。在此，通过一种简单的工艺合成了多孔 a-Si，而不使用危险或昂贵的试剂、复杂的设备以及可能造成环境风险的强酸。这些多孔 a-Si 颗粒由于其多孔结构、非晶态性质和表面修饰而表现出优异的电化学性能。它们在 3 A g 的电流密度下循环 700 次后，可提供 1025 mAh g 的容量。此外，电化学激活后的可逆容量在整个循环过程中非常稳定，容量保持率约为 88%。a-Si 和 c-Si 阳极之间的直接比较清楚地支持了 a-Si 在锂离子电池中的优势。
