标题：Safe all-solid-state potassium batteries with three dimentional, flexible and binder-free metal sulfide array electrode
作者：Fei, Huifang; Liu, Yining; An, Yongling; Xu, Xiaoyan; Zhang, Jinyang; Xi, Baojuan; Xiong, Shenglin; Feng, Jinkui
作者机构：[Fei, Huifang; Liu, Yining; An, Yongling; Xu, Xiaoyan; Zhang, Jinyang; Feng, Jinkui] Shandong Univ, Sch Mat Sci & Engn, Minist Educ, SDU & Rice Joint 更多
通讯作者：Feng, Jinkui;Feng, JK
通讯作者地址：[Feng, JK]Shandong Univ, Sch Mat Sci & Engn, Minist Educ, SDU & Rice Joint Ctr Carbon Nanomat,Key Lab Liqui, Jinan 250061, Shandong, Peoples R China.
来源：JOURNAL OF POWER SOURCES
关键词：Potassium-ion batteries; Solid polymer electrolyte; Ni3S2 electrode;; Binder-free; All-solid-state
摘要：Potassium ion batteries attract great attentions on account of their inherent advantages, such as high working voltage, low cost and abundant resources. However, safety issues and low energy density hinder their practical application. Herein, we successfully demonstrate a highly safe all-solid-state potassium-ion battery with a poly (ethylene oxide)-bis(flourosulfonyl)imide potassium based solid polymer electrolyte and a binder-free, three-dimensional, array-structured Ni3S2 electrode. It is found that the PEO-based SPE can not only address the safety issues but also enhance the cycling performance of the Ni3S2 by restricting the diffusion of polysulfides. The all solid-state Ni3S2-K batteries show a high reversible capacity and a good cycling performance at 55 degrees C. Moreover, the Ni3S2 electrode could be used not only as the cathode for potassium batteries with potassium metal as anode but also the anode for potassium-ion batteries.