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天然石墨表面自组装SnO2-FeO(OH)高容量锂离子电池负极

杨稳稳 周玉林 王梦月 张利亚 雷建飞

杨稳稳, 周玉林, 王梦月, 张利亚, 雷建飞. 天然石墨表面自组装SnO2-FeO(OH)高容量锂离子电池负极[J]. 华南师范大学学报(自然科学版), 2021, 53(2): 29-34. doi: 10.6054/j.jscnun.2021023
引用本文: 杨稳稳, 周玉林, 王梦月, 张利亚, 雷建飞. 天然石墨表面自组装SnO2-FeO(OH)高容量锂离子电池负极[J]. 华南师范大学学报(自然科学版), 2021, 53(2): 29-34. doi: 10.6054/j.jscnun.2021023
YANG Wenwen, ZHOU Yulin, WANG Mengyue, ZHANG Liya, LEI Jianfei. The Self-assembled SnO2-FeO(OH) on Natural Graphite Surface as A High-capacity Anode for Lithium Ion Batteries[J]. Journal of South China normal University (Natural Science Edition), 2021, 53(2): 29-34. doi: 10.6054/j.jscnun.2021023
Citation: YANG Wenwen, ZHOU Yulin, WANG Mengyue, ZHANG Liya, LEI Jianfei. The Self-assembled SnO2-FeO(OH) on Natural Graphite Surface as A High-capacity Anode for Lithium Ion Batteries[J]. Journal of South China normal University (Natural Science Edition), 2021, 53(2): 29-34. doi: 10.6054/j.jscnun.2021023

天然石墨表面自组装SnO2-FeO(OH)高容量锂离子电池负极

doi: 10.6054/j.jscnun.2021023
基金项目: 

河南省自然科学基金项目 162300410093

河南省科技攻关项目 212102210580

详细信息
    通讯作者:

    雷建飞, Email: leijianfei9966@163.com

  • 中图分类号: TM911;O646.21

The Self-assembled SnO2-FeO(OH) on Natural Graphite Surface as A High-capacity Anode for Lithium Ion Batteries

  • 摘要: 利用双水解反应制备含稳定胶束H2SnO3@Fe(OH)3的胶体溶液,并在静电吸附作用下将其自组装到天然石墨表面,经水热反应构建了表面具有SnO2-FeO(OH)精细结构的石墨负极体系. 结构表征结果显示:水热反应后天然石墨表面存在致密的纳米结构包覆层,该包覆层是由超细SnO2纳米晶颗粒(粒径 < 6 nm)弥散的非晶态FeO(OH)组成. 电化学测试结果表明:在石墨表面构建SnO2-FeO(OH)精细纳米结构不仅能提升其充电/放电容量,而且还可改善其循环稳定性. 在0.1C充放电流密度下,经表面修饰的天然石墨首次充放电效率达到77.5%,循环100次后放电容量仍能维持在384.4 mAh/g,放电容量较商用天然石墨提高了23%.
  • 图  1  材料的表征结果

    Figure  1.  The characterization of samples

    图  2  不同材料的循环稳定性对比

    Figure  2.  The stability comparison of different materials

    图  3  材料的倍率性能对比

    Figure  3.  The comparison of C-rate performance of the two samples

    图  4  2 mA/s扫描速率下C@SnO2-FeO(OH)的循环伏安曲线

    Figure  4.  The CV curves of C@SnO2-FeO(OH) at 2 mA/s

    图  5  天然石墨与C@SnO2-FeO(OH)的交流阻抗图

    Figure  5.  The electrochemical impedance spectroscopy of the graphite and C@SnO2-FeO(OH)

    图  6  Li+在天然石墨和C@SnO2-FeO(OH)中的嵌入示意图

    Figure  6.  The schematic diagram for lithium ions insertion into the graphite and the C@SnO2-FeO(OH)

    表  1  天然石墨与C@SnO2-FeO(OH)的交流阻抗拟合值

    Table  1.   The fitting values of the graphite and C@SnO2-FeO(OH) based on the AC impedance experiments

    循环次数 天然石墨 C@SnO2-FeO(OH)
    Ro Rct Zw DLi+/(×10-19 cm2·s-1) Ro Rct Zw DLi+/(×10-19 cm2·s-1)
    0 2.9 815.5 1 116.1 0.23 2.1 796.6 794.9 0.29
    1 2.1 246.5 670.7 1.74 2.1 154.2 492.7 3.79
    3 2.3 242.9 640.9 1.98 2.3 202.5 419.1 2.86
    5 2.6 264.5 640.7 1.87 2.5 231.8 393.9 2.54
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  • 收稿日期:  2021-01-04
  • 刊出日期:  2021-04-25

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