华东师范大学学报（自然科学版） >

2022 , Vol. 2022 >Issue 1: 52 - 61

DOI: https://doi.org/10.3969/j.issn.1000-5641.2022.01.007

物理学与电子学

硅碳复合结构对锂离子电池负极电化学性能的影响

  • 田晓华 ,
  • 余晨露 ,
  • 郑瀚 ,
  • 孙卓 ,
  • 张哲娟 ,
  • 朴贤卿
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  • 华东师范大学 物理与电子科学学院 纳光电集成与先进装备教育部工程研究中心, 上海　200241

收稿日期: 2021-04-23

  网络出版日期: 2022-01-18

基金资助

上海市科委项目(19DZ1205102, 20DZ1202106)

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Effect of silicon/carbon composite structure on its electrochemical performance as a lithium-ion battery anode

  • Xiaohua TIAN ,
  • Chenlu YU ,
  • Han ZHENG ,
  • Zhuo SUN ,
  • Zhejuan ZHANG ,
  • Xianqing PIAO
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  • Engineering Research Center for Nanophotonics and Advanced Instrument (Ministry of Education), School of Physics and Electronic Science, East China Normal University, Shanghai　200241, China

Received date: 2021-04-23

  Online published: 2022-01-18

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摘要

以晶硅太阳能电池生产过程中的晶硅切削废料为原料、以壳聚糖(Chitosan, CTS)为碳源, 通过液相包裹和低温热解工艺制备了具有较大孔隙的硅/硬碳复合材料(Si@CTS). 对比研究了Si@CTS及Si@CTS混合石墨后(Si@CTS/G)分别作为锂离子电池负极的电化学性能. 结果表明, 具有孔隙和互联结构的Si@CTS负极首次放电比容量可达到1672.8 mAh/g, 首次库伦效率达到了84.45%; 在循环100圈之后Si@CTS放电比容量保持在626.4 mAh/g. 进一步, 将Si@CTS作为高容量活性物质添加至石墨中, 研磨混合后制得的Si@CTS/G复合负极表现出良好的稳定性, 在循环100圈之后放电比容量为698.1 mAh/g, 对高容量高稳定性硅碳负极批量化生产和应用具有重要意义.

关键词： 亚微米硅; 硅废料; 硅碳负极材料; 锂离子电池; 联结结构

本文引用格式

田晓华 , 余晨露 , 郑瀚 , 孙卓 , 张哲娟 , 朴贤卿 . 硅碳复合结构对锂离子电池负极电化学性能的影响[J]. 华东师范大学学报（自然科学版）, 2022 , 2022(1) : 52 -61 . DOI: 10.3969/j.issn.1000-5641.2022.01.007

Abstract

Porous silicon/hard carbon composite (Si@CTS) was successfully fabricated using liquidphase encapsulation and a low-temperature pyrolysis process, in which silicon particles from cutting waste in the manufacturing of crystalline silicon solar cells was used as a raw material and chitosan as carbon source. In this paper, the electrochemical performance of Si@CTS and a mixture of Si@CTS and graphite (Si@CTS/G) as anode materials of a lithium-ion battery was studied. The Si@CTS electrode showed a high discharge specific capacity of 1672.8 mAh/g and a high initial coulombic efficiency of 84.45%. After 100 cycles, the Si@CTS retained a reversible capacity of 626.4 mAh/g. The discharge specific capacity of the Si@CTS/G composite was 698.1 mAh/g; hence, the discharge specific capacity of the Si@CTS/G composite was higher than that of Si@CTS and offered better stability. The findings are critical for mass manufacture and deployment of silicon/carbon anodes with high capacity and stability in lithium-ion batteries.

Key words： sub-micron silicon; silicon waste; silicon/carbon composite; lithium-ion battery; interconnected structure

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