Chem. J. Chinese Universities ›› 2019, Vol. 40 ›› Issue (11): 2375.doi: 10.7503/cjcu20190258

• Physical Chemistry • Previous Articles     Next Articles

Suppression of Shuttle Effect of Lithium-sulfur Batteries by Tris(2-carboxyethyl)phosphine Interlayer

HUANG Yapan,SUN Xiaogang(),LI Rui,LIANG Guodong,WEI Chengcheng,HU Hao   

  1. School of Mechantronics Engineering, Nanchang University, Nanchang 330031, China
  • Received:2019-05-06 Online:2019-11-10 Published:2019-07-15
  • Contact: SUN Xiaogang E-mail:xiaogangsun@163.com
  • Supported by:
    ? Supported by the Fund of Science & Technology Transformation Program for Universities in Jiangxi Province, China(KJLD3006)

Abstract:

In order to prevent the thermodynamics shuttle effect, improve the electrochemical performance of lithium sulfur batteries, the tris(2-carboxyethyl)phosphine-aramid paper(TCEP-AP) interlayer was sandwiched between cathode and separator. The morphology and structure of materials were observed by transmission electron microscopy(TEM), scanning electron microscopy(SEM), infrared spectroscopy and energy dispersive spectroscopy(EDS). Electrochemical tests show that TCEP can be an especially effective agent to cut polysulfides, and the initial discharge capacity reached 1544 mA·h·g -1 for S-TCEP-AP Li-S battery at 0.1C. The S-TCEP-AP Li-S battery specific discharge capacity remains at 609 mA·h·g -1, and a negligible fading rate of 0.029% per cycle at 1C was obtained after 400 cycles. The S-TCEP-AP Li-S battery shows good multipliability and cyclic performance.

Key words: Lithium-sulfur battery, Redox reaction, Phosphophilic ester, Interlayer, Shuttle effect, Lithium polysulfides

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