Unraveling the reaction reversibility and structure stability of nickel sulfide anodes for lithium ion batteries  

作　　者：Yu Huang Chunyuan Liang Yueling Cai Yi Zhou Bingkun Guo Jipeng Cheng Heguang Liu Peng Wang Qianqian Li Anmin Nie Hongtao Wang Jinsong Wu Tongyi Zhang 

机构地区：[1]Materials Genome Institute,Shanghai University,Shanghai 200444,China [2]Center for X-mechanics,Zhejiang University,Hangzhou 310027,Zhejiang,China [3]School of Materials Science and Engineering,Zhejiang University,Hangzhou 310027,Zhejiang,China [4]School of Materials Science and Engineering,Xi'an University of Technology,Xi'an 048,Shaanx,Chin [5]Shanghai Key Laboratory of Mechanics in Energy Engineering,Shanghai Institute of Applied Mathematics and Mechanics,School of Mechanics and Engineering Science,Shanghai University,Shanghai 200444,China [6]Center for High Pressure Science,State Key Laboratory of Metastable Materials Science and Technology,Yanshan University,Qinhuangdao 066004,Hebei,China [7]State Key Laboratory of Advanced Technology for Materials Synthesis and Processing,Nanostructure Research Center,Wuhan University of Technology,Wuhan 430070,Hubei,China

出　　处：《Journal of Energy Chemistry》2023年第5期392-401,I0010,共11页能源化学（英文版）

基　　金：the support by the National Natural Science Foundation of China(11972219 and 11902185);the support of Shanghai Sailing Program(19YF1415100);the Young Elite Scientist Sponsorship Program by CAST(2019QNRC001);the support of the National Natural Science Foundation of China(52090022);the Natural Science Foundation for Distinguished Young Scholars of Hebei Province(E2020203085)。

摘　　要：The electrochemical performance of lithium-ion batteries,i.e.specific capacity and cyclability,is primarily determined by chemical reversibility and structural stability of the electrodes in cycling.Here we have investigated the fundamental reaction behaviors of nickel sulfide(NixSy)as lithium-ion battery anodes by in-situ TEM.We find that Ni_(3)S_(2)is the electrochemically stable phase,which appears in the first cycle of the NixSyanode.From the second cycle,conversion between Ni_(3)S_(2)and Li_(2)S/Ni is the dominant electrochemical reaction.In lithiation,the NixSynanoparticles evolve into a mixture of Ni nanocrystals embedded in Li_(2)S matrix,which form a porous structure upon full lithiation,and with the recrystallization of the Ni_(3)S_(2)phase in delithiation,a compact and interconnected network is built.Structural stability in cycles is susceptible to particle size and substrate restraint.Carbon substrate can certainly improve the tolerance for size-dependent pulverization of NixSynanoparticles.When NixSynanoparticle exceeds the critical size value,the morphology of the particle is no longer well maintained even under the constraints of the carbon substrate.This work deepens the understanding of electrochemical reaction behavior of conversiontype materials and helps to rational design of high-energy density battery anodes.

关 键 词：Nickel sulfide anodes Reaction reversility Structure rebuilding In-situ TEM Lithium-ion battery 

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