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1T′‐ReS 2 Nanosheets In Situ Grown on Carbon Nanotubes as a Highly Efficient Polysulfide Electrocatalyst for Stable Li–S Batteries

Journal Article · · Advanced Energy Materials
 [1];  [2];  [2];  [3];  [2]
  1. State Key Laboratory of Electronic Thin Films and Integrated Devices University of Electronic Science and Technology of China Chengdu 610054 P. R. China, Materials Science and Engineering Program &, Texas Materials Institute The University of Texas at Austin Austin TX 78712 USA
  2. Materials Science and Engineering Program &, Texas Materials Institute The University of Texas at Austin Austin TX 78712 USA
  3. State Key Laboratory of Electronic Thin Films and Integrated Devices University of Electronic Science and Technology of China Chengdu 610054 P. R. China
Abstract

The practical viability of Li–S cells depends on achieving high electrochemical utilization of sulfur under realistic conditions, such as high sulfur loading and low electrolyte/sulfur (E/S) ratio. Here, metallic 2D 1T′‐ReS 2 nanosheets in situ grown on 1D carbon nanotubes (ReS 2 @CNT) via a facile hydrothermal reaction are presented to efficiently suppress the “polysulfide shuttle” and promote lithium polysulfide (LiPS) redox reactions. The designed ReS 2 @CNT nanoarchitecture with high conductivity and rich nanoporosity not only facilitates electron transfer and ion diffusion, but also possesses abundant active sites providing high catalytic activity for efficient LiPS conversion. Li–S cells fabricated with ReS 2 @CNT exhibit high capacity with superior long‐term cyclability with a capacity retention of 71.7% over 1000 cycles even at a high current density of 1C (1675 mA g −1 ). Also, pouch cells fabricated with the ReS 2 @CNT/S cathode maintain a low capacity fade rate of 0.22% per cycle. Furthermore, the electrocatalysis mechanism is revealed based on electrochemical studies, theoretical calculations, and in situ Raman spectroscopy.

Sponsoring Organization:
USDOE
OSTI ID:
1617524
Alternate ID(s):
OSTI ID: 1801674
Journal Information:
Advanced Energy Materials, Journal Name: Advanced Energy Materials Journal Issue: 23 Vol. 10; ISSN 1614-6832
Publisher:
Wiley Blackwell (John Wiley & Sons)Copyright Statement
Country of Publication:
Germany
Language:
English

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