High-volumetric-capacity WSe2 Anode for Potassium-ion Batteries

• 作者: CHEN Ming ZHAO Jun-Mei SUN Chuan-Fu
• 来源期刊: 结构化学
• 年，卷（期）: 2021,（7）
• 所属期刊栏目: materials structural chemistry
• 页码范围: 926-932
• 页数: 7页
• 语种: 英文
• DOI: 10.14102/j.cnki.0254-5861.2011-3106

摘要

Exploring high-capacity electrode materials is critical for the development of K-ion batteries.In this work,we report a layered-structured tungsten selenide(WSe2)anode,which not only delivers an ultrahigh volumetric capacity of 1772.8 Ah/L(or 188.4 mAh/g)at a current density of 5 mA/g but also exhibits good rate capability(72 mAh/g at 200 mA/g)and cycling stability(83.14％capacity retention over 100 cycles at 100 mA/g).We have also revealed the underlying reaction mechanism through ex situ X-ray powder diffraction.Furthermore,proof-of-concept full-cell batteries comprising of WSe2 anodes and Prussian Blue cathodes are capable of delivering an energy density of 135.2 Wh/kgcathode+anode.This work highlights the potential of WSe2 as a promising high-volumetric-capacity anode material for rechargeable potassium-ion batteries.