文献类型：期刊文献

英文题名：Encapsulating Nanoscale Silicon inside Carbon Fiber as Flexible Self-Supporting Anode Material for Lithium-Ion Battery

作者：Li, Wangwu[1];Peng, Jiao[1];Li, Hui[1];Wu, Zhenyu[1];Huang, Yuehua[1];Chang, Baobao[2];Guo, Xiaowei[3];Chen, Gairong[3];Wang, Xianyou[1]

第一作者：Li, Wangwu

通讯作者：Wang, XY[1]

机构：[1]Xiangtan Univ, Natl Base Int Sci & Technol Cooperat, Natl Local Joint Engn Lab Key Mat New Energy Stor, Sch Chem,Hunan Prov Key Lab Electrochem Energy St, Xiangtan 411105, Hunan, Peoples R China;[2]Zhengzhou Univ, Minist Educ, Key Lab Mat Proc & Mold, Zhengzhou 450001, Henan, Peoples R China;[3]Xinxiang Univ, Sch Chem & Mat Engn, Xinxiang 453003, Henan, Peoples R China

第一机构：Xiangtan Univ, Natl Base Int Sci & Technol Cooperat, Natl Local Joint Engn Lab Key Mat New Energy Stor, Sch Chem,Hunan Prov Key Lab Electrochem Energy St, Xiangtan 411105, Hunan, Peoples R China

通讯机构：[1]corresponding author), Xiangtan Univ, Natl Base Int Sci & Technol Cooperat, Natl Local Joint Engn Lab Key Mat New Energy Stor, Sch Chem,Hunan Prov Key Lab Electrochem Energy St, Xiangtan 411105, Hunan, Peoples R China.

年份：2021

卷号：4

期号：8

起止页码：8529-8537

外文期刊名：ACS APPLIED ENERGY MATERIALS

收录：;EI(收录号：20213410807721);Scopus(收录号：2-s2.0-85113664206);WOS:【SCI-EXPANDED(收录号:WOS:000688250200114)】；

基金：This work was supported financially by the Key Project of Strategic New Industry of Hunan Province (No. 2019GK2032) and the National Natural Science Foundation of China (No. U19A2018). The authors would like to thank Shiyanjia Lab (www.shiyanjia.com) for the XPS test.

语种：英文

外文关键词：lithium-ion battery; core-shell nanofibers; electrospinning; self-supporting; Si/C anodes

摘要：At present, the main limitations for the practical application of silicon (Si) as an anode material of a lithium-ion battery are huge volume variation and low electrical conductivity. Core-shell silicon/carbon (Si/C) composites can greatly relieve the Si large volume change and accelerate the low Li+ conductivity; however, cracking of carbon shell and the failure of the electrode structure still limit the lithium storage capability and cyclic life. Herein, a flexible freestanding N-doped core-shell Si/C nanofiber (SC-NF) anode is prepared by the double-nozzle electrospinning technique. It has been found that in such fibers, Si particles are encapsulated by the carbon shell of fibers, which can settle the shortcomings of pulverization and volume variation of Si. Furthermore, the highly conductive N-C shell derived from carbonized PAN can accelerate the diffusion of Li+ and charge transport. As a result, the as-prepared core-shell SC-NF-0.24 electrode exhibits an initial specific discharge capacity of 1441 mAh g(-1) with a high capacity retention of 76.9% at 0.5 A g(-1), and the capacity decay rate of per cycle is only 0.1% (starting on the third cycle), showing a good cycle property. Therefore, the as-prepared freestanding core-shell SC-NF material is a prospective anode material for high-performance lithium-ion batteries.