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Y_(2)O_(3)modification on nickel-rich LiNi_(0.8)Co_(0.1)Mn_(0.1)O_(2)with improved electrochemical performance in lithium-ion batteries

查看全文 作　　者：Rui [1,2]He;Xue [1,2]Bai;Aijia [1,2]Wei;Lihui [1,2]Zhang;Peng [3]Liu;Zhenfa [1,2]Liu 高影响力作者 机构地区：[1]Institute of Energy Resources,Hebei Academy of Science,Shijiazhuang 050081,China;[2]Hebei Engineer Research Center for Water Saving in Industry,Shijiazhuang 050081,China;[3]Shijiazhuang Suntec-Chem Co.,Ltd,Shijiazhuang 050000,China高影响力机构 出　　处：《Journal of Rare Earths》索引2022年第40卷第2期,共10页高影响力期刊 基　　金：Project supported by Hebei Province Major Scientific and Technological Achievements Transformation Project(20284401Z)。 摘　　要：Doping and coating are frequently employed for the improvement of the properties of Ni-rich NCM materials.In this work,we prepared stable LiNi_(0.8)Co_(0.1)Mn_(0.1)O_(2)(NCM811)materials modified withY_(2)O_(3)via a wet chemical method.In order to investigate the action mechanism ofY_(2)O_(3)on NCM811,we analyzed the micro structures using X-ray diffraction(XRD),X-ray photoelectron spectroscopy(XPS),scanning electron microscopy(SEM),and transmission electron microscopy(TEM).Also,to study the electrochemical performances,we conducted a charge/discharge test and cyclic voltammetry.Our results show thatY_(2)O_(3)modified NCM811 materials have good thermal stability,and proper content ofY_(2)O_(3)can effectively prevent the materials from damaging and significantly improve the electrochemical properties of the materials.Particularly,1%Y2 O3 modified NCM811 material show much better cycling performance than other samples.During cycling at 1.0 C the 1%Y2 O3 modified NCM811 shows capacity retention of 90.1%after 100 cycles,which is higher than 69.4%for pristine NMC811.We examined the microstructures of the materials before and after circulation.Using the SEM results,we conclude that structural changes are among the key factors that lead to the degradation of the electrochemical properties of materials. 关 键 词：LiNi_(0.8)Co_(0.1)Mn_(0.1)O_(2) Y_(2)O_(3)modification Lithium-ion batteries Rare earths
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