journal article·2022-07-04

Ether-Induced Phase Transition toward Stabilized Layered Structure of MoS2 with Extraordinary Sodium Storage Performance

Dongmei Lin, Xiuling Shi, Kaikai Li, Man Wang, Sheng Sun, Junwei Wu, Limin Zhou, Guohua Chen, Tong-Yi Zhang

ACS Materials Letters· Volume 4· Issue 7
Publisher page

Abstract

Ether-based electrolytes have long been proven to be advantageous over ether-based electrolytes in sodium ion batteries (SIBs), but the understanding of their effect on the phase transition of electrode materials during electrochemical cycling is very limited. In this work, we study the phase transition and electrochemical performance of 2H-MoS2 in ether- and ester-based electrolytes. Interestingly, we find that the MoS2 anode develops MoS2/diglyme-Na+ superlattices induced by cointercalation of Na+ and an ether solvent in an ether-based electrolyte, rather than the conversion reaction observed in ester-based electrolytes. The superlattices consist of mixed semiconductive 2H and metallic 1T phases, and are structurally stable and kinetically favorable for the repeated sodiation, which greatly enhances the capacity, cycling, and rate performance of MoS2. Specifically, the three-dimensional MoS2 nanoflowers deliver an ultrahigh capacity of 446.5 mAh g(-1) at 5 A g(-1) with no capacity fading after more than 3700 cycles in an ether-based electrolyte.
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Research context

OpenAlex topics: Advancements in Battery Materials · MXene and MAX Phase Materials · Advanced Battery Materials and Technologies

SciVX discovery tags are terminology-based. OpenAlex topics are source-provided classifications.

Affiliations

School of Materials Science and Engineering, Harbin Institute of Technology, Shenzhen 518055, China

Department of Mechanical Engineering, Research Institute for Smart Energy, The Hong Kong Polytechnic University, Kowloon, Hong Kong SAR, China

School of Chemical Engineering, Xi’an Jiaotong University, Xi’an Shaanxi 710049, China

Materials Genome Institute, Shanghai University, 333 Nanchen Road, Shanghai 200444, China

School of System Design and Intelligent Manufacturing, Southern University of Science and Technology, Shenzhen 518055, China

The Hong Kong University of Science and Technology (Guangzhou), Advanced Materials Thrust and Sustainable Energy and Environment Thrust, Nansha, Guangzhou 511400, Guangdong, China

Funding

Guangdong Basic and Applied Basic Research Foundation · Shenzhen Science and Technology Program · GDSTC-Guangdong-HK-Macao Joint Laboratory for Photonic-Thermal-Electrical Energy Materials and Devices

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