Citation: WANG Jinying, QU Jiangying, LI Jielan, TANG Zhanlei, ZANG Yunhao, WANG Tao, GU Jianfeng, ZHOU Gang, GAO Feng. Two-Step Coating Synthesis of Silicon/Carbon Composite Based on Coal Tar Pitch and Its Lithium Battery Performance[J]. Chinese Journal of Applied Chemistry, ;2020, 37(5): 562-569. doi: 10.11944/j.issn.1000-0518.2020.05.190306 shu

Two-Step Coating Synthesis of Silicon/Carbon Composite Based on Coal Tar Pitch and Its Lithium Battery Performance

WANG Jinying ^a,b ,
QU Jiangying ^b ,
LI Jielan ^a ,
TANG Zhanlei ^c ,
ZANG Yunhao ^b ,
WANG Tao ^b ,
GU Jianfeng ^b ,
ZHOU Gang ^b ,
GAO Feng ^b,,

a.
Faculty of Chemistry and Chemical Engineering, Liaoning Normal University, Dalian, Liaoning 116029, China
b.
School of Environment and Civil Engineering, Dongguan University of Technology, Dongguan, Guangdong 523808, China
c.
Guangdong Kaijin New Energy Technology Corp, Ltd. Dongguan, Guangdong 523808, China

Corresponding author: GAO Feng, fenggao2003@163.com
Received Date: 15 November 2019
Revised Date: 3 January 2020
Accepted Date: 20 February 2020

Fund Project: the NSFC U1610114Supported by the NSFC(No.U1610114), the Natural Science Fund of Liaoning Province(No.201602458), and the Research Platform Project of Liaoning Province Department of Education(No.L201683657)the Research Platform Project of Liaoning Province Department of Education L201683657the Natural Science Fund of Liaoning Province 201602458

Figures(3)

Silicon/carbon (Si/C/C) composites based on the coal pitch was successfully prepared by a two-step method. Commercially available nano-silicon and coal pitch with low softening point, high carbon ratio and low price were used as the silicon and carbon sources, respectively. The electrochemical properties of the as-obtained composites as the negative electrode of the lithium ion batteries were systematically investigated. The results show that the obtained composite has a particle size in the range of 300 to 350 nm. The Si nanoparticles coated with C are bonded to each other to form a C-Si-C network structure, in which the silicon(27% mass fraction)/carbon composite (Si/C/C-27%) exhibits good lithium storage performance as a lithium battery electrode material. In addition, the Si/C/C-27% composite has a specific discharge capacity of 1281 mA·h/g at a current density of 0.1 A/g; at a current density of 3 A/g, the composite has a specific discharge capacity of 582 mA·h/g, showing good rate performance. The cycle efficiency retention of the product is 76.61% after 100 cycling times at the current density of 2 A/g, which also demonstrates its high stability. Compared with the one-step carbon-coated silicon(Si/C) material, Si/C/C material not only effectively improves the conductivity but inhibits the volume expansion of Si particles during lithiation and de-lithiation. This new proposed method provides a new research idea for preparing lithium ion battery anode materials with excellent electrochemical performance.
- coal pitch-based carbon,
- silicon carbon composite,
- lithium ion battery,
- anode material
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