Mechanistic insight into the role of N-doped carbon matrix in electrospun binder-free Si@C composite anode for lithium-ion batteries
作者:Shen, KX (Shen, Kaixiang)[ 1 ] ; Chen, HD (Chen, Hedong)[ 1 ] ; Hou, XH (Hou, Xianhua)[ 1 ] ; Wang, SF (Wang, Shaofeng)[ 1 ] ; Qin, HQ (Qin, Haiqing)[ 2 ] ; Gao, YM (Gao, Yumei)[ 3 ] ; Shen, JD (Shen, Jiadong)[ 4,5 ]
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IONICS
DOI: 10.1007/s11581-020-03484-x
Early access icon在线发表日期: FEB 2020
文献类型:Article; Early Access
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摘要
To improve the long cyclic stability and rate capability of Si-based anode, we demonstrate a core-shell structural Si@NC composite decorates with N-doped carbon network using a low-cost, a simple process of electrospinning and low-temperature pyrolysis. Si@PVP/Urea fabric composite spun on the copper foil was directly carbonized and then was cut into wafers used as the electrode plates without extra conductive agent and binder. The enhanced rate capability and cyclic stability of special structural Si@NC is mainly ascribable to N-doped carbon matrix providing numerous active sites, which attract Li to those points in an efficient way, and the core-shell structures supply high mechanical strength for Si@NC composite. Importantly, almost 3-fold improvement in the capacity retention rate of the Si@NC has been observed at high current densities of 1.6 and 3.2 A g(-1). Meanwhile, DFT calculations confirm that Li will be easily adsorbed by N-active sites in N-doped carbon model to strengthen chemical absorption ability, which could have more chance to grab the quickly moving Li in a brief period. It is significant for theoretical guidance of subsequent studies. The findings should make an important contribution providing a great possibility for the mass production and application to the field of lithium-ion battery.
关键词
作者关键词:Anode; Electrospinning; Core-shell; Binder-free; Rate capability
KeyWords Plus:HIGH-PERFORMANCE; ENHANCED PERFORMANCE; GRAPHENE OXIDE; NANOFIBERS; LAYER; NANOPARTICLES
作者信息
通讯作者地址: Hou, XH (通讯作者)
显示更多South China Normal Univ, Guangdong Prov Key Lab Quantum Engn & Quantum Mat, Sch Phys & Telecommtmicat Engn, Engn Res Ctr MTEES,Minist Educ,Guangdong Engn Tec, Guangzhou 510006, Peoples R China.
地址:
显示更多[ 1 ] South China Normal Univ, Guangdong Prov Key Lab Quantum Engn & Quantum Mat, Sch Phys & Telecommtmicat Engn, Engn Res Ctr MTEES,Minist Educ,Guangdong Engn Tec, Guangzhou 510006, Peoples R China
[ 2 ] China Nonferrous Met Guilin Geol & Min Co Ltd, Guangxi Key Lab Super Hard Mat, Guilin 541004, Peoples R China
显示更多[ 3 ] Univ Elect Sci & Technol, Zhongshan Inst, Zhongshan 528402, Peoples R China
显示更多[ 4 ] South China Univ Technol, Sch Mat Sci & Engn, Guangzhou 510641, Peoples R China
显示更多[ 5 ] South China Univ Technol, Guangdong Prov Key Lab Adv Energy Storage Mat, Guangzhou 510641, Peoples R China
电子邮件地址:houxianhua@m.scnu.edu.cn
基金资助致谢
基金资助机构显示详情授权号
National Natural Science Foundation of China
U1601214
National Natural Science Foundation of Guangdong Province
U1601214
Scientific and Technological Plan of Guangdong Province
2018B050502010
018A050506078
2017B090901027
National Natural Science Foundation of Guangdong Province
2017A030310166
Project of Blue Fire Plan
CXZJHZ201708
CXZJHZ201709
Science and Technology Project Foundation of Zhongshan City of Guangdong Province of China
2018B1127
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出版商
SPRINGER HEIDELBERG, TIERGARTENSTRASSE 17, D-69121 HEIDELBERG, GERMANY
期刊信息
Impact Factor (影响因子): Journal Citation Reports
类别 / 分类
研究方向:Chemistry; Electrochemistry; Physics
Web of Science 类别:Chemistry, Physical; Electrochemistry; Physics, Condensed Matter