Article ID | Journal | Published Year | Pages | File Type |
---|---|---|---|---|
5488758 | Current Applied Physics | 2017 | 22 Pages |
Abstract
We prepared single-crystal Si nanoparticles (Si NPs) â¼50Â nm in diameter using a laser photopyrolysis technique and formed a nitrogen-doped carbon layer on them using pyrrole and FeCl3 to increase the cycle stability of the Si anodes during volume expansion and contraction. The surface chemical bonding states of the nitrogen-doped carbon-coated Si NPs were investigated. The specific capacity and capacity retention of the sample with 1Â g of FeCl3 were the highest at approximately 967.1Â mAh gâ1 and 87.3% after 300 cycles at 1Â C, respectively. The diffusion coefficient of Li ions after 1000 test cycles was 9.64Â ÃÂ 10â8Â cm2Â s-1. The higher cycling stability of the Si@NC NPs could be attributed to the nitrogen-doped carbon layers, which provided an efficient transport pathway for the electrons.
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Authors
Hun Seok Choi, Su Jae Kim, Hyun Woo Choi, Cheul-Eon Park, Ying Jun Gao, Yang Hang, Se-Young Jeong, Jong-Pil Kim, Jong-Seong Bae, Chae-Ryong Cho,