Advanced Potassium-Ion Batteries with High Areal Capacity  

作　　者：Song Chen Jiang Zhong Hongli Deng Qiliang Wei Xiaohua Shen Xinxin Jia Shengyang Li Qiusheng Zhang Jian Zhu Bingan Lu Weiyou Yang 

机构地区：[1]State Key Laboratory for Chemo/Biosensing and Chemometrics,College of Chemistry and Chemical Engineering,College of Materials Science and Engineering,College of Physics and Electronics,Hunan Key Laboratory of Two-Dimensional Materials,Engineering Research Center of Advanced Catalysis of the Ministry of Education,Hunan University,Changsha 410082 [2]Institute of Micro/Nano Materials and Devices,Ningbo University of Technology,Ningbo 315211

出　　处：《CCS Chemistry》2024年第4期1011-1023,共13页中国化学会会刊（英文）

基　　金：supported by the National Natural Science Foundation of China(grant nos.52074113,22005091,and 22005092);the Hunan University Outstanding Youth Science Foundation(grant no.531118040319).

摘　　要：High areal capacity is one of the critically important points for potassium-ion batteries(PIBs)for practical applications,which relies on high areal-massloading electrodes operating at high reversible capacity.However,it is remarkably restricted by the mechanical instability and sluggish charge transfer induced by the increased mass loading.To overcome such challenge,we report the rationally designed bimetallic selenides CoSe2/SnSe2 heterostructures confined in hierarchical carbon nanofibers(CSSe@CNFs),which enables the electrodes robust mechanical stability,enhanced electron transport,and reduced ion-diffusion energy barrier for facilitating reaction kinetics.Accordingly,an impressive areal mass loading up to 25.3 mg cm^(−2)was achieved,which endowed a high areal capacity of 7.58 mAh cm^(−2)for such a free-standing electrode.This is stateof-the-art among the PIBs,exceeding that of today’s industry standard(∼3 mAh cm^(−2)for LIBs).Furthermore,it delivered long-term stability over 3700 cycles at high current density(∼2 mA cm^(−2),vs 1 mA cm^(−2)in LIBs).Moreover,the as-constructed full battery achieved a high energy density of 172.8 Wh kg-1 at 0.05 A g^(−1)with a satisfied cycle stability over 2000 cycles at 2 A g^(−1)and high reversibility with Coulombic efficiency of 100%;thus,signifying its bright future toward commercial application for advanced PIBs.

关 键 词：bimetal selenides HETEROSTRUCTURE mass loading areal capacity potassium-ion battery 

分 类 号：O62[理学—有机化学]