Tailoring the Polymer-Derived Carbon Encapsulated Silicon Nanoparticles for High-Performance Lithium-Ion Battery Anodes

被引:50
作者
Ma, Qiang [1 ]
Xie, Hongwei [1 ]
Qu, Jiakang [1 ]
Zhao, Zhuqing [1 ]
Zhang, Beilei [1 ]
Song, Qiushi [1 ]
Xing, Pengfei [1 ]
Yin, Huayi [1 ,2 ]
机构
[1] Northeastern Univ, Sch Met, Shenyang 110819, Peoples R China
[2] Northeastern Univ, Minist Educ, Key Lab Data Analyt & Optimizat Smart Ind, Shenyang 110819, Peoples R China
关键词
Si@polymer; Si@C; anode; lithium-ion battery; melamine resin; carbonization; SI-C NANOCOMPOSITES; POROUS SILICON; AT-CARBON; HIGH-CAPACITY; DOPED GRAPHENE; ACTIVE-SITES; COMPOSITE; NITROGEN; HETEROSTRUCTURES; ELECTRODES;
D O I
10.1021/acsaem.9b01463
中图分类号
O64 [物理化学(理论化学)、化学物理学];
学科分类号
070304 ; 081704 ;
摘要
The structure, dopants, and surface area of carbon determine the performance of the core-shell structured silicon and carbon composite (Si@C) anode for Li-ion batteries (LIBs). Herein, we report the synthesis of Si@C composite from poly(vinyl alcohol) (PVA)/melamine resin (MR) dual layer polymer derived carbon encapsulated Si nanoparticles using a polymerization-carbonization approach. The dual polymer layer derived carbon coating has adequate void spaces and dopants, possesses a disordered structure, and seals the Si core sufficiently. Hence, the obtained Si@C-MR anode delivers a superior specific capacity of 1279.3 mA h/g at a current density of 2 A/g and with a retention rate of 88.9% after 500 cycles. A full cell with a Li(Ni0.6Co0.2Mn0.2)O-2 cathode and a prelithiated Si@C-MR anode exhibits a high energy density above 518 Wh/kg and capacity retention of 90.1% after 100 cycles. In parallel, the other three polymer-derived Si@C composites were prepared to study the effect of carbon on the performance of the composite anodes. Overall, constructing a dual-polymer layer holds the promise for rationally designing Si@C anodes for high-performance LIBs through the polymerization-carbonization approach.
引用
收藏
页码:268 / 278
页数:21
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