Fluorinated soft carbon as an ultra-high energy density potassium-ion battery cathode enabled by a ternary phase K_(x)FC  

作　　者：Pengyu Chen Bojun Wang Zhenrui Wu Xiaobin Niu Chuying Ouyang Hong Li Liping Wang 

机构地区：[1]School of Materials and Energy,University of Electronic Science and Technology of China,Chengdu 611731,Sichuan,China [2]School of Engineering,The University of British Columbia,Kelowna V1V 1V7,Canada [3]C Innovation Laboratory,Contemporary Amperex Technology Ltd.(21C LAB),Ningde 352100,Fujian,China [4]Key Laboratory for Renewable Energy,Institute of Physics,Chinese Academy of Sciences,Beijing 100190,China

出　　处：《Journal of Energy Chemistry》2023年第2期38-44,I0002,共8页能源化学（英文版）

基　　金：supported by the National Natural Science Foundation of China(52072061);21C Innovation Laboratory,Contemporary Amperex Technology Ltd.by project No.21C–OP–202103。

摘　　要：Fluorinated carbons(CFx)have been widely applied as lithium primary batteries due to their ultra-high energy density.It will be a great promise if CFx can be rechargeable.In this study,we rationally tune the C-F bond strength for the alkaline intercalated CFx via importing an electronegative weaker element K instead of Li.It forms a ternary phase K_(x)FC instead of two phases(LiF+C)in lithium-ion batteries.Meanwhile,we choose a large layer distance and more defects CFx,namely fluorinated soft carbon,to accommodate K.Thus,we enable CFx rechargeable as a potassium-ion battery cathode.In detail fluorinated soft carbon CF_(1.01) presents a reversible specific capacity of 339 mA h g^(-1)(797 Wh kg^(-1))in the 2nd cycle and maintains 330 mA h g^(-1)(726 Wh kg^(-1))in the 15th cycle.This study reveals the importance of tuning chemical bond stability using different alkaline ions to endow batteries with rechargeability.This work provides good references for focusing on developing reversible electrode materials from popular primary cell configurations.

关 键 词：Fluorinated carbon High energy density battery Potassium-ion battery Conversion reaction K-free cathode 

分 类 号：TM912[电气工程—电力电子与电力传动] TQ127.1[化学工程—无机化工]