Boosting potassium-ion batteries by few-layered composite anodes prepared via solution-triggered one-step shear exfoliation

Yajie Liu, Zhixin Tai, Jian Zhang, Wei Kong Pang, Qing Zhang, Haifeng Feng, Konstantin Konstantinov, Zaiping Guo () and Hua Kun Liu
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Yajie Liu: University of Wollongong, Innovation Campus
Zhixin Tai: University of Wollongong, Innovation Campus
Jian Zhang: Changsha University of Science and Technology
Wei Kong Pang: University of Wollongong, Innovation Campus
Qing Zhang: University of Wollongong, Innovation Campus
Haifeng Feng: University of Wollongong, Innovation Campus
Konstantin Konstantinov: University of Wollongong, Innovation Campus
Zaiping Guo: University of Wollongong, Innovation Campus
Hua Kun Liu: University of Wollongong, Innovation Campus

Nature Communications, 2018, vol. 9, issue 1, 1-10

Abstract: Abstract Earth-abundant potassium is a promising alternative to lithium in rechargeable batteries, but a pivotal limitation of potassium-ion batteries is their relatively low capacity and poor cycling stability. Here, a high-performance potassium-ion battery is achieved by employing few-layered antimony sulfide/carbon sheet composite anode fabricated via one-step high-shear exfoliation in ethanol/water solvent. Antimony sulfide with few-layered structure minimizes the volume expansion during potassiation and shortens the ion transport pathways, thus enhancing the rate capability; while carbon sheets in the composite provide electrical conductivity and maintain the electrode cycling stability by trapping the inevitable by-product, elemental sulfur. Meanwhile, the effect of the exfoliation solvent on the fabrication of two-dimensional antimony sulfide/carbon is also investigated. It is found that water facilitates the exfoliation by lower diffusion barrier along the [010] direction of antimony sulfide, while ethanol in the solvent acts as the carbon source for in situ carbonization.

Date: 2018
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DOI: 10.1038/s41467-018-05786-1

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