LiAlO_2包覆LiNi_(0.8)Co_(0.1)Mn_(0.1)O_2的电化学性能

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英文篇名：Electrochemical performance of LiNi_(0.8)Co_(0.1)Mn_(0.1)O_2 coated with LiAlO_2 作者：赵振江 ; 吴诗德 ; 张林森 ; 闫莉 英文作者：ZHAO Zhen-jiang;WU Shi-de;ZHANG Lin-sen;YAN Li;School of Material and Chemical Engineering,Zhengzhou University of Light Industry;School of Applied Technology,Huanghe Science and Technology College; 关键词：LiNi_(0.8)Co_(0.1)Mn_(0.1)O_2 ; LiAlO_2 ; 包覆 ; 循环稳定性 ; 电化学性能 英文关键词：LiNi_(0.8)Co_(0.1)Mn_(0.1)O_2;;α-LiAlO_2;;coating;;cycle stability;;electrochemical performance 中文刊名：DACI 英文刊名：Battery Bimonthly 机构：郑州轻工业学院材料与化学工程学院;黄河科技学院应用技术学院; 出版日期：2019-02-25 出版单位：电池 年：2019 期：v.49;No.255 基金：河南省自然科学基金(162300410315);; 河南省科技攻关项目(182102210163);; 郑州市科技发展计划(20150441);; 郑州轻工业学院大学生科技活动项目 语种：中文; 页：DACI201901008 页数：4 CN：01 ISSN：43-1129/TM 分类号：32-35

摘要

采用高温固相法在LiNi_(0.8)Co_(0.1)Mn_(0.1)O_2表面包覆一层LiAlO_2。XRD和SEM分析结果表明:包覆前后的材料均为具有R-3m空间群的α-Na FeO_2层状结构;包覆量为1%的样品颗粒表面形成了一层均匀的絮状包覆物LiAlO_2。电化学性能测试结果表明:包覆量为1%的样品性能较好,以20 mA/g的电流在2. 5～4. 3 V充放电,首次放电比容量为165. 47 mAh/g,较未包覆材料低17. 33 mAh/g,但循环稳定性得到提高,循环30次的容量保持率达90. 88%,高于未包覆材料的59. 71%。
        A layer of LiAlO_2 was coated on the surface of LiNi_(0. 8) Co_(0. 1) Mn_(0. 1) O_2 by high temperature solid phase method. XRD and SEM analysis showed that the materials before and after coating were α-Na FeO_2 layered structures with R-3 m space group. A uniform floc-like coating of LiAlO_2 was formed on the surface of the sample particles with 1% coating amount. The electrochemical performance test showed that the sample with a coating amount of 1% had better performance,the first discharge specific capacity at a voltage range of 2. 5 to 4. 3 V and at a current 20 mA/g was 148. 29 mAh/g,which was 17. 33 mAh/g lower than the uncoated material,but the cycle stability was improved. The capacity retention rate after the 30 cycles of 2. 5 to 4. 3 V at a current 20 mA/g was 90. 88%,which was higher than 59. 71% of the uncoated material.

引文

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