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硅酸盐通报 ›› 2021, Vol. 40 ›› Issue (11): 3740-3749.

• 陶瓷 • 上一篇    下一篇

多孔竹炭负载SnO2的制备及其电化学性能研究

吴洪, 陈前林, 李翠芹   

  1. 贵州大学化学与化工学院,贵阳 550025
  • 收稿日期:2021-05-14 修回日期:2021-06-10 出版日期:2021-11-15 发布日期:2021-12-08
  • 通讯作者: 陈前林,博士,教授。E-mail:cql1018@163.com
  • 作者简介:吴洪(1994—),男,硕士研究生。主要从事锂离子电池电极材料方面的研究。E-mail:2378518385@qq.com
  • 基金资助:
    贵州省高层次人才培养计划(QKHPTRC[2016]5658)

Preparation and Electrochemical Performance of SnO2 Supported on Porous Bamboo Charcoal

WU Hong, CHEN Qianlin, LI Cuiqin   

  1. College of Chemistry and Chemical Engineering, Guizhou University, Guiyang 550025, China
  • Received:2021-05-14 Revised:2021-06-10 Online:2021-11-15 Published:2021-12-08

摘要: 多孔竹炭为无定形碳,具有丰富的孔结构,孔径分布在1~6 nm之间,且具有较大的孔体积(1.21 cm3/g)。本文以多孔竹炭为载体,采用溶胶-凝胶法制得B2O3-SnO2/C复合材料。SEM和TEM结果显示SnO2和B2O3均匀分布在多孔竹炭表面。多孔竹炭和B2O3有效缓冲SnO2可逆反应的体积变化,提高SnO2的循环稳定性。将B2O3-SnO2/C复合材料作为负极组装成锂离子半电池,进行电化学性能测试,在1 C(1 C=372 mA/g)倍率下充放电循环200次结束后仍然保留649.9 mAh/g的放电比容量,放电比容量保留率为58.6%。B2O3-SnO2/C复合材料充放电过程受扩散和电容两种行为控制,电容控制的贡献率随着扫描速率的增大而增大。

关键词: B2O3-SnO2/C复合材料, 循环稳定性, 锂离子电池, 负极材料, 多孔竹炭, 溶胶-凝胶法

Abstract: Porous bamboo charcoal is amorphous carbon with abundant pore structure, and the pore size ranges from 1 nm to 6 nm, with a large pore volume (1.21 cm3/g). Using porous bamboo charcoal as the carrier, the B2O3-SnO2/C composite material was prepared by the sol-gel method. SEM and TEM results show that SnO2 and B2O3 are uniformly distributed on the surface of the porous bamboo charcoal. The porous bamboo charcoal and B2O3 effectively accommodate the volume change of the reversible reaction of SnO2 and improve the cycling stability of SnO2. The lithium-ion batteries were assembled by B2O3-SnO2/C composite materials as anode, and the electrochemical performance was tested. After 200 cycles, the discharge specific capacity still reaches 649.9 mAh/g at 1 C (1 C=372 mA/g) rate, and the discharge specific capacity retention rate is as high as 58.6%. The charge-discharge process of B2O3-SnO2/C porous composites is controlled by diffusion and capacitance behavior, and the contribution rate of capacitance control increases with the increase of scan rate.

Key words: B2O3-SnO2/C composite, cycling stability, lithium-ion battery, anode material, porous bamboo charcoal, sol-gel method

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