Mechanistic insight into the role of N-doped carbon matrix in electrospun binder-free Si@C composite anode for lithium-ion batteries

时间:2020-07-07作者:浏览量:52


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