Promoting superior K-ion storage of Bi2S3 nanorod anode via graphene physicochemical protection and electrolyte stabilization effect

Lingling Yuan, Qianwen Zhou, Ting Li, Yikun Wang, Zhengqing Liu and Shaokun Chong

Applied Energy, 2022, vol. 322, issue C, No S0306261922007978

Abstract: Potassium-ion batteries (PIBs) have been considered as next generation energy storage device due to abundant and inexpensive resources, and exploring suitable anode materials based on conversion-alloying dual mechanism will promote the fast development of high energy density PIBs. In this work, Bi2S3 nano-rods wrapped by reduced graphene oxide (Bi2S3@rGO) are regarded as anodes for K-ion storage. The physical encapsulation of graphene and chemical bonding of Bi-O can boost the composite to provide outstanding electrochemical kinetics and structure stability. Furthermore, the electrolyte stabilization effect plays an important role in generating a more robust solid electrolyte interface film and maintaining effectiveness of chemical bonding. It is demonstrated by ex situ TEM that Bi2S3 electrode undergoes a dual electrochemical mechanism of conversion-alloying relied on 12 K-ion diffusion per formula unit (Bi2S3 + 6 K ↔ 2Bi + 3K2S, 2Bi + 6 K ↔ 2K3Bi). The above desirable features are integrated into the conductive composite for great cycling stability with high-capacity retention of 148.3 mAh·g−1 after 100 cycles at 50 mA·g−1. This work will guide the way for the construction of dual mechanism anode and the understanding of K-ion storage principle.

Keywords: Potassium-ion batteries; Anode material; Bismuth sulfide; Conversion-alloying mechanism; Electrolyte (search for similar items in EconPapers)
Date: 2022
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DOI: 10.1016/j.apenergy.2022.119471

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