Surface deterioration dependent on the crystal facets of spinel LiNi_(0.5)Mn_(1.5)O_(4) cathode active material  

作　　者：Qian Li Yan Zhao Jifu Zhu Wujiu Zhang Yi Liu Yaru Cui Chao Shen Keyu Xie 

机构地区：[1]School of Metallurgical Engineering,Xi'an University of Architecture and Technology,Xi'an 710055,Shaanxi,China [2]State Key Laboratory of Solidification Processing,Center for Nano Energy Materials,Northwestern Polytechnical University and Shaanx joint Laboratory of Graphene(NPU),Xi'an 710072,Shaanxi,China [3]Shaanxi Union Research Center of University and Enterprise for Cathode Materials of LIBs,Xi'an 710072,Shaanxi,China [4]CRRC Zhu Zhou Institute Co.,Ltd.,Zhuzhou 412000,Hunan,China

出　　处：《Journal of Energy Chemistry》2024年第10期757-766,I0016,共11页能源化学（英文版）

基　　金：supported by the National Natural Science Foundation of China (52374311);the National Natural Science Foundation of Shaanxi (2022KXJ-146);the Fundamental Research Funds for the Central Universities (D5000230091);Open project of Shaanxi Laboratory of Aerospace Power (2022ZY2-JCYJ-01-09);full-depth-sea battery project (No.2020-XXXX-XX-246-00);the Youth Innovation Team of Shaanxi Universities。

摘　　要：The spinel LiNi_(0.5)Mn_(1.5)O_(4)(LNMO)cathode active materials(CAMs)are considered a promising alternative to commercially available cathodes such as layered and polyanion oxide cathodes,primarily due to their notable safety and high energy density,particularly in their single-crystal type.Nevertheless,the industrial application of the LNMO CAMs is severely inhibited due to the interfacial deterioration and corrosion under proton-rich and high-voltage conditions.This study successfully designed and synthesized two typical types of crystal facets-exposed single-crystal LNMO CAMs.By tracking the electrochemical deterioration and chemical corrosion evolution,this study elucidates the surface degradation mechanisms and intrinsic instability of the LNMO,contingent upon their crystal facets.The(111)facet,due to its elevated surface energy,is found to be more susceptible to external attack compared to the(100)and(110)facets.Our study highlights the electrochemical corrosion stability of crystal plane engineering for spinel LNMO CAMs.

关 键 词：LiNi_(0.5)Mn_(1.5)O_(4) Crystal facets Electrochemical degradation Chemical corrosion Surface energy 

分 类 号：TB34[一般工业技术—材料科学与工程]