高等学校化学学报 ›› 2018, Vol. 39 ›› Issue (12): 2725.doi: 10.7503/cjcu20180436

• 物理化学 • 上一篇    下一篇

二氧化硅/木质素多孔碳复合材料的制备及作为锂离子电池负极材料的性能

李常青1,4, 杨东杰1,4, 席跃宾1,4, 秦延林3, 邱学青1,2,4()   

  1. 1. 华南理工大学化学与化工学院
    2. 制浆造纸工程国家重点实验室, 广州 510640
    3. 广东工业大学轻工化工学院, 广州 510640
    4. 华南理工大学广东省绿色精细化学产品工程技术研究开发中心, 广州 510640
  • 收稿日期:2018-06-13 出版日期:2018-12-03 发布日期:2018-08-31
  • 作者简介:

    联系人简介: 邱学青, 男, 博士, 教授, 博士生导师, 主要从事木质素资源化利用的应用基础研究. E-mail: cexqqiu@scut.edu.cn

  • 基金资助:
    国家自然科学基金(批准号: 21878114, 21436004)和广东省科技计划项目(批准号: 2017B090903003, 2017A030308012)资助.

Synthesis and Electrochemical Performance of Silica/Porous Lignin Carbon Composites as Anode Materials for Lithium-ion Batteries

LI Changqing1,4, YANG Dongjie1,4, XI Yuebin1,4, QIN Yanlin3, QIU Xueqing1,2,4,*()   

  1. 1. School of Chemistry and Chemical Engineering
    2. State Key Lab of Pulp and Paper Engineering, South China University of Technology, Guangzhou 510640, China
    3. School of Chemical Engineering and Light Industry, Guangdong University of Technology, Guangzhou 510640, China
    4. Guangdong Province Key Lab of Green Chemical Product Technology,South China University of Technology, Guangzhou 510640, China
  • Received:2018-06-13 Online:2018-12-03 Published:2018-08-31
  • Contact: QIU Xueqing E-mail:cexqqiu@scut.edu.cn
  • Supported by:
    † Supported by the National Natural Science Foundation of China(Nos.21878114, 21436004) and the Science and Technology Program of Guangdong Province, China(Nos.2017B090903003, 2017A030308012).

摘要:

将来源于造纸黑液中的碱木质素(AL)通过水热反应与纳米二氧化硅(SiO2)复合, 制备了二氧化硅/季铵化碱木质素复合物(SiO2/QAL), 再经过碳化和酸洗后得到二氧化硅/木质素多孔碳复合材料(SiO2/PLC). 形貌与结构表征结果表明, SiO2/PLC的比表面积达到1069 m2/g, 具有平均孔径约20 nm的介孔结构. 二氧化硅纳米颗粒均匀分散在三维网络结构的木质素多孔碳内部. 电化学性能测试结果表明, SiO2/PLC作为锂离子电池负极材料具有良好的倍率性能和循环性能, 在100 mA/g电流密度下经过100周循环后放电比容量为820 mA·h/g, 在5 A/g大电流密度下嵌锂容量达到235 mA·h/g.

关键词: 锂离子电池, 负极材料, 二氧化硅, 木质素多孔碳

Abstract:

The alkali lignin(AL) derived from pulping liquor was used as raw materials to prepare the silica/quaternized alkali lignin composite(SiO2/QAL) by hydrothermal reaction, and then the silica/porous lignin carbon composite(SiO2/PLC) was obtained after carbonization and etching. SiO2/PLC exhibited a specific surface area of 1069 m2/g and mesoporous pore size of 20 nm on average. As anode materials for lithium-ion batteries, silica nanoparticles were dispersed uniformly in the porous lignin carbon with a three dimensional network, leading to better cycle performance and rate capability. The electrochemical measurement showed that SiO2/PLC displayed a high capacity of 820 mA·h/g after 100 cycles at a current density of 100 mA/g and 235 mA·h/g at a large current density of 5 A/g.

Key words: Lithium-ion battery, Anode material, Silica, Porous lignin carbon

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