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

• DOI: 10.1038/s41467-018-05786-1
• Publication Date: 2018-09-03T14:01:32Z
• Authors: Yajie Liu; Zhixin Tai; Jian Zhang; Wei Kong Pang; Qing Zhang; Haifeng Feng; Konstantin Konsta...; Zaiping Guo; Hua Kun Liu
• Keywords: Boosting; Exfoliation joint

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