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

doi:10.11944/j.issn.1000-0518.2020.05.190306

Chinese Journal of Applied Chemistry ›› 2020, Vol. 37 ›› Issue (5): 562-569.DOI: 10.11944/j.issn.1000-0518.2020.05.190306

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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^*()

^aFaculty of Chemistry and Chemical Engineering,Liaoning Normal University,Dalian,Liaoning 116029,China
^bSchool of Environment and Civil Engineering,Dongguan University of Technology, Dongguan,Guangdong 523808,China
^cGuangdong Kaijin New Energy Technology Corp,Ltd. Dongguan,Guangdong 523808,China

Received:2019-11-15 Accepted:2020-02-20 Published:2020-05-01 Online:2020-04-29
Contact: GAO Feng
Supported by:
Supported 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)

Abstract

Abstract:

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.

Key words: coal pitch-based carbon, silicon carbon composite, lithium ion battery, anode material

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.

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

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