Boosting lifespan of conversion-reaction anodes for full/half potassium-ion batteries via multi-dimensional carbon nano-architectures confinement effect  

作　　者：Weifang Zhao Xinyue Xu Lin Wang Ying Liu Tengfei Zhou Shilin Zhang Juncheng Hu Qingqing Jiang 

机构地区：[1]Key Laboratory of Catalysis and Energy Materials Chemistry of Ministry of Education,South-Central Minzu University,Wuhan 430074,Hubei,China [2]Institutes of Physical Science and Information Technology,Anhui University,Hefei 230601,Anhui,China [3]School of Chemical Engineering&Advanced Materials,University of Adelaide,Adelaide,SA 5005,Australia

出　　处：《Journal of Energy Chemistry》2022年第12期55-65,I0003,共12页能源化学（英文版）

基　　金：supported by the National Natural Science Foundation of China(21806187,51802357)。

摘　　要：Transition metal selenides are regarded as prospective conversion-reaction anodes for potassium-ion batteries(PIBs)because of their relatively high electrical conductivity,large theoretical specific capacity,abundant resources and low cost.The challenge of the metal selenides originates from a serious volume change during cycling,which induces serious structural collapse and fast capacity degradation.In the present work,the multi-dimensional carbon nano-architectures confined bimetallic selenides(ZnSe/CoSe_(2)@N-CNTs/rGO)were constructed by a facile MOF-assisted strategy.In such special nanoarchitectures,N-doped CNTs protect the metal selenides centers from serious volume expansion/electrode pulverization,as well as improve the sluggish kinetics.ZnSe/CoSe_(2)@N-CNTs/rGO electrode boosts the lifespan of half PIBs with a large discharge specific capacity of 200 m Ah g^(-1)at 2 A g^(-1)after 3800 cycles.The full PIBs battery with ZnSe/CoSe_(2)@N-CNTs/rGO electrode as anode and Prussian blue as cathode exhibits well electrochemical performance(151 m Ah g^(-1)at 100 m A g^(-1)after 100 cycles).DFT calculation suggests that the CNTs could change the K+adsorption energy and decrease K+diffusion energy barrier,which dramatically enhances K+storage kinetics.This work offers an effective material engineering approach for designing hierarchical“all-in-one”electrodes with high excellent cycling stability for PIBs.

关 键 词：Conversion-reaction anodes Metal selenides Multi-dimensional carbon Potassium-ion battery 

分 类 号：TQ127.11[化学工程—无机化工] TB383.1[一般工业技术—材料科学与工程] TM912[电气工程—电力电子与电力传动]