物理化学学报 >> 2010, Vol. 26 >> Issue (02): 283-290.doi: 10.3866/PKU.WHXB20100205

电化学 上一篇    下一篇

高性能锂-硫电池用复合正极的构造与粘结剂

伍英蕾, 杨军, 王久林, 尹利超, 努丽燕娜   

  1. 上海交通大学化学工程系, 上海 200240
  • 收稿日期:2009-07-27 修回日期:2009-10-12 发布日期:2010-01-26
  • 通讯作者: 杨军 E-mail:yangj723@sjtu.edu.cn

Composite Cathode Structure and Binder for High Performance Lithium-Sulfur Battery

WU Ying-Lei, YANG Jun, WANG Jiu-Lin, YIN Li-Chao, NULI Yan-Na   

  1. Department of Chemical Engineering, Shanghai Jiaotong University, Shanghai 200240, P. R. China
  • Received:2009-07-27 Revised:2009-10-12 Published:2010-01-26
  • Contact: YANG Jun E-mail:yangj723@sjtu.edu.cn

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摘要：

采用球磨混合及热处理方法制备了含有多壁碳纳米管(MCNTs)的硫基复合正极材料, 利用X射线衍射(XRD)和扫描电子显微镜(SEM)测定材料的结构和形貌, 较系统地研究了MCNTs含量和粘结剂种类对硫基复合正极容量、循环稳定性和自放电行为等的影响. 结果表明: MCNTs的合适含量为5%-8%(w, 质量分数), 以水性粘结剂环糊精制备的硫基复合正极电化学性能最佳. 锂-硫电池在常温和半充电状态下放置30天几乎没有自放电; 当电流倍率为0.1C时, β-环糊精为粘结剂的正极初始充电容量为687.7 mAh·g-1, 100次循环以后可逆容量为623.8 mAh·g-1, 容量保持率达90.7%.

关键词: 锂-硫电池, 硫基正极, 多壁碳纳米管, 水性粘结剂, 环糊精

Abstract:

Ball milling in combination with heat treatment was used to prepare sulfur-based composite cathode materials incorporating multi-walled carbon nanotubes (MCNTs) for Li-S battery. The structure and morphology of the as-prepared cathode materials were characterized by X-ray diffraction (XRD) and scanning electron microscopy (SEM). The effect of MCNT content and binder type on the capacity, cyclability and self-discharge behavior of a sulfur-based cathode were systematically investigated. Results show that the appropriate amount of MCNTs is 5%-8% (w, mass fraction) and the use of β-cyclodextrin as a water-soluble binder to fabricate the cathode results in the best electrochemical performance. When the Li-S battery was half charged at room temperature, there was almost no self-discharge during storage for 30 d. The charging capacity was 687.7 mAh·g-1 during the 1st cycle and 623.8 mAh·g-1 during the 100th cycle for the cathode at a current rate of 0.1C. Therefore, 90.7%of the capacity was retained.

Key words: Li-S battery, Sulfur-based cathode, MCNTs, Water-soluble binder, Cyclodextrin