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Vol. 11 (2019)

Battery Separators Functionalized with Edge-Rich MoS2/C Hollow Microspheres for the Uniform Deposition of Li2S in High-Performance Lithium–Sulfur Batteries

https://doi.org/10.1007/s40820-019-0275-z
Nan Zheng
Lab of Low‑Dimensional Materials Chemistry, Key Laboratory for Ultrafine Materials of Ministry of Education, Shanghai Engineering Research Center of Hierarchical Nanomaterials, School of Materials Science and Engineering, East China University of Science and Technology, Shanghai 200237, People’s Republic of China
Guangyu Jiang
Lab of Low‑Dimensional Materials Chemistry, Key Laboratory for Ultrafine Materials of Ministry of Education, Shanghai Engineering Research Center of Hierarchical Nanomaterials, School of Materials Science and Engineering, East China University of Science and Technology, Shanghai 200237, People’s Republic of China
Xiao Chen
Lab of Low‑Dimensional Materials Chemistry, Key Laboratory for Ultrafine Materials of Ministry of Education, Shanghai Engineering Research Center of Hierarchical Nanomaterials, School of Materials Science and Engineering, East China University of Science and Technology, Shanghai 200237, People’s Republic of China
Jiayi Mao
Lab of Low‑Dimensional Materials Chemistry, Key Laboratory for Ultrafine Materials of Ministry of Education, Shanghai Engineering Research Center of Hierarchical Nanomaterials, School of Materials Science and Engineering, East China University of Science and Technology, Shanghai 200237, People’s Republic of China
Nan Jiang
Lab of Low‑Dimensional Materials Chemistry, Key Laboratory for Ultrafine Materials of Ministry of Education, Shanghai Engineering Research Center of Hierarchical Nanomaterials, School of Materials Science and Engineering, East China University of Science and Technology, Shanghai 200237, People’s Republic of China
Yongsheng Li
Lab of Low‑Dimensional Materials Chemistry, Key Laboratory for Ultrafine Materials of Ministry of Education, Shanghai Engineering Research Center of Hierarchical Nanomaterials, School of Materials Science and Engineering, East China University of Science and Technology, Shanghai 200237, People’s Republic of China

Corresponding Author: Yongsheng Li

ysli@ecust.edu.cn

Nano-Micro Letters, Vol. 11 (2019), Article Number: 43

Abstract

As promising energy storage systems, lithium–sulfur (Li–S) batteries have attracted significant attention because of their ultra-high energy densities. However, Li–S battery suffers problems related to the complex phase conversion that occurs during the charge–discharge process, particularly the deposition of solid Li2S from the liquid-phase polysulfides, which greatly limits its practical application. In this paper, edge-rich MoS2/C hollow microspheres (Edg-MoS2/C HMs) were designed and used to functionalize separator for Li–S battery, resulting in the uniform deposition of Li2S. The microspheres were fabricated through the facile hydrothermal treatment of MoO3–aniline nanowires and a subsequent carbonization process. The obtained Edg-MoS2/C HMs have a strong chemical absorption capability and high density of Li2S binding sites, and exhibit excellent electrocatalytic performance and can effectively hinder the polysulfide shuttle effect and guide the uniform nucleation and growth of Li2S. Furthermore, we demonstrate that the Edg-MoS2/C HMs can effectively regulate the deposition of Li2S and significantly improve the reversibility of the phase conversion of the active sulfur species, especially at high sulfur loadings and high C-rates. As a result, a cell containing a separator functionalized with Edg-MoS2/C HMs exhibited an initial discharge capacity of 935 mAh g−1 at 1.0 C and maintained a capacity of 494 mAh g−1 after 1000 cycles with a sulfur loading of 1.7 mg cm−2. Impressively, at a high sulfur loading of 6.1 mg cm−2 and high rate of 0.5 C, the cell still delivered a high reversible discharge capacity of 478 mAh g−1 after 300 cycles. This work provides fresh insights into energy storage systems related to complex phase conversions.


Highlights:


1 Edge-rich MoS2/C hollow microspheres (Edg-MoS2/C HMs) were fabricated through the simple hydrothermal treatment of MoO3–aniline nanowires and a subsequent carbonization process.
2 The Edg-MoS2/C HMs ensure the uniform deposition of Li2S on the matrix and the enhanced utilization of active edge sites.
3 The cell with an Edg-MoS2/C HM-functionalized separator displayed excellent electrochemical performance, with a high reversible discharge capacity of 478 mAh g−1 after 300 cycles at a high sulfur loading of 6.1 mg cm−2 and high rate of 0.5 C.

Keywords

Edge-rich MoS2/C Hollow microspheres Li2S Lithium–sulfur batteries
Zheng, Nan, Guangyu Jiang, Xiao Chen, Jiayi Mao, Nan Jiang, and Yongsheng Li. 2019. “Battery Separators Functionalized With Edge-Rich MoS2/C Hollow Microspheres for the Uniform Deposition of Li2S in High-Performance Lithium–Sulfur Batteries”. Nano-Micro Letters 11 (May):43. https://doi.org/10.1007/s40820-019-0275-z.
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