Energy Storage Science and Technology ›› 2022, Vol. 11 ›› Issue (11): 3447-3454.doi: 10.19799/j.cnki.2095-4239.2022.0340

• Energy Storage Materials and Devices • Previous Articles     Next Articles

High-performance lithium-sulfur batteries enabled by a separator modified by lithium-doped zeolite

Xiaofei WANG(), Dawei LAN, Daoming ZHANG, Haoliang XUE, Sifei ZHOU, Chuang LIU, Jun LI(), Zhendong WANG   

  1. State Key Laboratory of Green Chemical Engineering and Industrial Catalysis, SINOPEC Shanghai Research Institute of Petrochemical Technology, Shanghai 201208, China
  • Received:2022-06-20 Revised:2022-07-25 Online:2022-11-05 Published:2022-11-09
  • Contact: Jun LI E-mail:wangxf.sshy@sinopec.com;lijun.sshy@sinopec.com

Abstract:

Although lithium-sulfur batteries are attractive for next-generation high-energy-density rechargeable batteries, their practical uses are limited by the severe shuttle effect of polysulfides. In this study, a lithium-doped zeolite (Li@CHA) was effectively prepared using an ion-exchange technique and combined with graphene oxide (GO) to alter the conventional polypropylene separator to alleviate the shuttling problem of lithium-sulfur batteries. The morphology, structure, and electrochemical performance of Li@CHA were thoroughly studied using a scanning electron microscope, energy-dispersive X-ray spectroscopy, X-ray powder diffraction, and nitrogen adsorption-desorption technique and electrochemical measurements. The results revealed that the Li@CHA could act as an "ionic sieve" of the separator, efficiently hindering the free shuttle of polysulfide anions and enhancing the transport performance of Li+. Additionally, GO could suppress the shuttle effect through chemisorption, and improve the conductivity of the altered layer, thereby reducing the impedance of the battery. Hence, the lithium-sulfur battery employing the modified separator demonstrated enhanced reaction kinetics, excellent rate capability, and stable cycling performance, achieving a high rate capacity of 638 mAh/g at 3 C and a high capacity retention rate of 71.0% after 500 cycles at 0.5 C. This work provides a novel idea for suppressing the shuttle effect of polysulfides, which is anticipated to further promote the practical application of lithium-sulfur batteries.

Key words: zeolite, lithium-doped, separator, shuttle effect, lithium-sulfur batteries

CLC Number: