Journal
APPLIED ENERGY
Volume 322, Issue -, Pages -Publisher
ELSEVIER SCI LTD
DOI: 10.1016/j.apenergy.2022.119471
Keywords
Potassium-ion batteries; Anode material; Bismuth sulfide; Conversion-alloying mechanism; Electrolyte
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Funding
- Natural Science Basic Research Program of Shaanxi [2022JQ-113]
- China Postdoctoral Science Foundation [2021TQ0266]
- Guangdong Basic and Applied Basic Research Foundation [2021A1515110164, 2022A1515010208]
- Fundamental Research Funds for the Central Universities [G2020KY0534]
- State Key Laboratory for Mechanical Behavior of Materials [20212315]
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In this study, Bi2S3 nano-rods wrapped by reduced graphene oxide were developed as anode materials for potassium-ion batteries. The composite exhibited excellent electrochemical kinetics and structure stability, and stored potassium ions through a dual mechanism of conversion-alloying. The composite also showed high cycling stability and capacity retention.
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 3K(2)S, 2Bi + 6 K <-> 2K(3)Bi). 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.
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