储能科学与技术 ›› 2021, Vol. 10 ›› Issue (1): 104-110.doi: 10.19799/j.cnki.2095-4239.2020.0233

• 储能材料与器件 • 上一篇    下一篇

/活性炭复合材料的制备及其电化学性能

王瑨1(), 王建全2(), 阮殿波3, 谢皎1, 杨斌3   

  1. 1.四川佰思格新能源有限公司
    2.四川经科企业管理服务有限公司,四川 遂宁 629000
    3.宁波大学机械工程与力学学院,浙江 宁波 315000
  • 收稿日期:2020-07-22 修回日期:2020-08-20 出版日期:2021-01-05 发布日期:2021-01-08
  • 作者简介:王瑨(1983—),男,博士研究生,高级工程师,主要研究方向为新能源储能技术、锂电池以及材料技术,E-mail:105918999@qq.com|王建全,工程师,主要研究方向为新能源材料,E-mail:416801470@qq.com

Preparation and electrochemical performances of Si/activated carbon composites

Jin WANG1(), Jianquan WANG2(), Dianbo RUAN3, Jiao XIE1, Bin YANG3   

  1. 1.Sichuan Best Graphite New Energy Co. Ltd.
    2.Sichuan Jingke Eterprise Management Service Co. Ltd. , Suining 629000, Sichuan, China
    3.Faculty of Mechanical Engineering & Mechanics, Ningbo University, Ningbo 315000, Zhejiang, China
  • Received:2020-07-22 Revised:2020-08-20 Online:2021-01-05 Published:2021-01-08

摘要:

以纳米硅作为硅源,苯胺作为碳源,通过原位聚合结合炭化合成硅/炭复合材料,接着通过水蒸气物理活化得到硅/活性炭复合物。使用XRD、N2吸附法、透射电镜以及半电池充放电测试等方法对硅/活性炭复合材料的结构和锂电池性能进行分析。实验数据表明:水蒸气活化温度与活化时间分别为750 °C和 20 min时,得到的硅/活性炭复合材料表现出比硅/炭复合材料更好的倍率和循环性能,该样品在100、200、300和500 mA/g电流密度下的克容量分别为2860、2482、2212和1933 mA·h/g,当电流密度达到1000 mA/g时,克容量仍有1505 mA·h/g,而当电流密度降低为100 mA/g时,材料的克容量恢复到2554 mA·h/g,保持率为89.3%,反映了良好的倍率性能。

关键词: 硅/活性炭复合物, 电化学性能, 锂离子电池

Abstract:

Silicon/carbon (Si/C) composites were prepared from nano silicon and aniline by in-situ polymerization and carbonization. After further H2O steam activation, the Si/AC composites were obtained. The microstructure and electrochemical performances of the as-prepared Si/AC composites were characterized by X-ray diffraction, N2 isotherm adsorption, transmission electron microscopy, and galvanostatic chargedischarge measurement. The results show that when the activation temperature was 750°C and the activation time was 20 min, the obtained Si/AC composites showed a better high-rate and cycling performance than the Si/C composites. The specific capacities of the Si/AC 20 composites are 2860, 2482, 2212, and 1933 mA·h/g at the current densities of 100, 200, 300 and 500 mA/g. Moreover, the specific capacity is still as high as 1505 mA·h/g at the current density of 1000 mA/g. When the current density returns to 100 mA/g, the discharge specific capacity recovers to 2554 mA·h/g, with a capacity retention ratio of 89.3%.

Key words: Si/activated carbon composites, electrochemical performances, lithium-ion batteries

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