储能科学与技术 ›› 2020, Vol. 9 ›› Issue (3): 826-830.doi: 10.19799/j.cnki.2095-4239.2020.0086

• 储能材料与器件 • 上一篇    下一篇

高首效长寿命硅碳复合材料的制备及其电化学性能

张刚1(), 刘兴稳1, 张帆1, 陈至炜2   

  1. 1.中天超容科技有限公司,江苏 南通 226009
    2.中天储能科技有限公司,江苏 南通 226009
  • 收稿日期:2020-02-28 修回日期:2020-03-30 出版日期:2020-05-05 发布日期:2020-05-11
  • 作者简介:张刚(1978—),男,高级工程师,研究方向为锂离子电池材料、超级电容器材料及储能器件,E-mail: zhangg@chinaztt.com

Preparation and electrochemical performance of high initial coulombic efficiency and long life Si/C composite material

ZHANG Gang1(), LIU Xingwen1, ZHANG Fan1, CHEN Zhiwei2   

  1. 1.Zhongtian Supercapacitor Technology Co. Ltd. , Nangtong 226009, Jiangsu, China
    2.Zhongtian Energy Storage Technology Co. Ltd. , Nangtong 226009, Jiangsu, China
  • Received:2020-02-28 Revised:2020-03-30 Online:2020-05-05 Published:2020-05-11

摘要:

本工作以氧化亚硅(SiO)、沥青、硝酸铝和氢化锂为主要原料,通过层-层包覆和一系列化学反应,制备了SiO@C@Al2O3和Li-Si-O@C@LiAlO2的三明治结构的硅碳复合材料。采用SEM、TEM、XRD和激光粒度分析仪等对制备样品进行了微观形貌表征和物相结构分析,采用CR2032扣电评估不同材料的可逆比容量、首效和循环性能,结果表明,相比于普通SiO@C,改性后的SiO@C@Al2O3和Li-Si-O@C@LiAlO2复合材料在首效和循环性能上提升明显,呈现出优异的电化学性能。本工作制备方法操作简单、成本低,适合工业化生产。

关键词: 硅碳, Al2O3包覆, LiAlO2, 预锂化, 锂离子电池

Abstract:

Through layer-layer coating and series chemical reaction, the sandwich structure of SiO@C@Al2O3 and Li-Si-O@C@LiAlO2 was prepared by using SiO, pitch, aluminum nitrate and LiH as the main raw materials. The morphology and the phase structure of the samples were characterized by SEM, TEM, XRD and laser particle size analyzer. It was adopted by CR2032 cell to evaluate the reversible capacity, initial coulombic efficiency and capacity retention of different products. The results showed that compared with the common SiO@C, the modified SiO@C@Al2O3 and Li-Si-O@C@LiAlO2 composites had excellent electrochemical performance in initial Coulombic efficiency and capacity retention. This preparation was simple operation, low cost and suitable for industrial production.

Key words: SiO@C, Al2O3 coating, LiAlO2, pre-lithiated, lithium ion battery