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Synthesis and Electrochemical Investigation of O3-Type High-nickel NCM Cathodes for Sodium-ion Batteries

查看全文 作　　者：CHEN [1]Yawei;WANG [1]Shiyang;JIE [1]Yulin;LEI [1]Zhanwu;CAO [1]Ruiguo;JIAO [1]Shuhong 高影响力作者 机构地区：[1]Hefei National Laboratory for Physical Science at the Microscale,CAS Key Laboratory of Materials for Energy Conversion,Department of Materials Science and Engineering,University of Science and Technology of China,Hefei,230026,P.R.China高影响力机构 出　　处：《Chemical Research in Chinese Universities》索引2021年第37卷第2期,共6页高影响力期刊 基　　金：This work is supported by the National Key Research and Development Program of China(Nos.2017YFA0402802,2017YFA0206700);the National Natural Science Foundation of China(Nos.21776265,51902304,2190030094);the Anhui Provincial Natural Science Foundation,China(No.1908085ME122);the Fundamental Research Funds for the Central Universities of China(No.Wk2060140026). 摘　　要：Sodium ion batteries(SIBs)are promising energy storage devices for smart grid applications due to their low cost and the high abundance of sodium,but few cathode materials of SIBs with high energy density are available for practical applications.Herein,a series of NaNCM ternary materials(NCM=nickel-cobalt-manganese)is obtained by solid-phase reaction with well-regulated temperature and other reaction conditions.XRD results show that impure NiO phase is more likely to occur under high nickel content.The cross-section SEM indicates that the primary particles in the electrode materials are radially distributed along the radial direction,and the internal porous structure is conducive to the infiltration of electrolyte.The initial specific capacities of Na[Ni0.68Co0.10Mn0.22]O2(NaNCM712),Na[Ni0.6Co0.2Mn0.2]O2(NaNCM622)and Na[Ni0.4Co0.3Mn0.3]O2(NaNCM433)at 0.2 C are 165.5,153.1 and 146.8 mA·h/g,and the corresponding capacity retention rates are 63.2%,78.5%and 71.7%after 100 cycles.NaNCM712 possesses the highest initial specific capacity,and NaNCM433 delivers the best rate capability.The rate capabilities of high-nickel and low-cobalt NaNCM cathodes need to be further improved.Moreover,ex-situ XRD pattern reveals the structure evolution(from O3 type to P2 type)during a long cycling charge and discharge process. 关 键 词：Sodium-ion battery CATHODE Nickel-cobalt-manganese High-nickel Structure evolution
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