Construction and electrochemical mechanism investigation of hierarchical core-shell like composite as high performance anode for potassium ion batteries  

作　　者：Nadeem Hussain Suyuan Zeng Zhenyu Feng Yanjun Zhai Chunsheng Wang Mingwen Zhao Yitai Qian Liqiang Xu 

机构地区：[1]Key Laboratory of Colloid&Interface Chemistry,Ministry of Education and School of Chemistry and Chemical Engineering,Shandong University,Jinan 250100,China [2]Shandong Provincial Key Laboratory/Collaborative Innovation Center of Chemical Energy Storage&Novel Cell Technology,Liaocheng University,Liaocheng 252059,China [3]International Collaborative Laboratory of 2D Materials for Optoelectronics Science and Technology(Ministry of Education),Institute of Microscale Optoelectronics,Shenzhen University,Shenzhen 518060,China [4]School of Physics,Shandong University,Jinan 250100,China

出　　处：《Nano Research》2021年第10期3552-3561,共10页纳米研究（英文版）

基　　金：This work was supported by Academy of Sciences large apparatus United Fund(No.U1832187);the National Nature Science Foundation of China(No.22071135);the Nature Science Foundation of Shandong Province(No.ZR2019MEM030).

摘　　要：Potassium-ion batteries(PIBs)are promising candidates for next-generation energy storage devices due to the earth abundance of potassium,low cost,and stable redox potentials.However,the lack of promising high-performance electrode materials for the intercalation/deintercalation of large potassium ions is a major challenge up to date.Herein,we report a novel uniform nickel selenide nanoparticles encapsulated in nitrogen-doped carbon(defined as“NiSe@NC”)as an anode for PIBs,which exhibits superior rate performance and cyclic stability.Benefiting from the unique hierarchical core-shell like nanostructure,the intrinsic properties of metal-selenium bonds,synergetic effect of different components,and a remarkable pseudocapacitance effect,the anode exhibits a very high reversible capacity of 438 mA·h·g^(-1)at 50 mA·g^(-1),an excellent rate capability,and remarkable cycling performance over 2,000 cycles.The electrochemical mechanism were investigated by the in-situ X-ray diffraction,ex-situ high-resolution transmission electron microscopy,selected area electron diffraction,and first principle calculations.In addition,NiSe@NC anode also shows high reversible capacity of 512 mA·h·g^(-1)at 100 mA·g^(-1)with 84%initial Coulombic efficiency,remarkable rate performance,and excellent cycling life for sodium ion batteries.We believe the proposed simple approach will pave a new way to synthesize suitable anode materials for secondary ion batteries.

关 键 词：CORE-SHELL PSEUDOCAPACITANCE in-situ X-ray diffraction(XRD) first principle calculations potassium-ion batteries 

分 类 号：TM912[电气工程—电力电子与电力传动]