球形LiNi06Co02Mn02O2的制备及其电化学性能

PDF全文下载：  201803014.pdf

文章编号： 16726987（2018）03008306； DOI： 10.16351/j.16726987.2018.03.014

李丹， 卞彦新， 彭红瑞*， 李桂村*

（青岛科技大学 材料科学与工程学院，山东 青岛 266042)

摘要： 通过共沉淀法合成的球形Ni06Co02Mn02(OH)2前驱体与LiOH·H2O均匀混合，经高温固相反应合成了层状结构球形LiNi06Co02Mn02O2。利用扫描电子显微镜(SEM)对不同形成时间的球形前驱体形貌观察，结果表明：Ni06Co02Mn02(OH)2前驱体是由无数微小的纳米片由内而外竖向聚集而形成的二次颗粒，其形成经历了由疏松逐渐变致密的过程。经过高温锂化之后，一次结构由纳米层片转变为纳米颗粒，球状二次颗粒形貌未发生明显改变。X射线衍射(XRD)测试结果表明：与普通溶胶凝胶法的LiNi06Co02Mn02O2样品相比，球形LiNi06Co02Mn02O2具有更加完整的层状结构。充放电测试结果表明:球形LiNi06Co02Mn02O2具有更高的比容量、更好的循环稳定性、更好的倍率性能。球形LiNi06Co02Mn02O2在02 C(1 C=160 mA·g-1)时的放电容量达到1862 mA·h·g-1，05 C时达到1589 mA·h·g-1，1 C时达到1290 mA·h·g-1，100次循环后仍然可以保留889%的容量。

关键词： 锂离子电池； 正极材料； 电化学性能； LiNi06Co02Mn02O2

中图分类号：  TQ 325.1+2文献标志码： A

引用格式：李丹， 卞彦新， 彭红瑞, 等. 球形LiNi06Co02Mn02O2的制备及其电化学性能\[J\]. 青岛科技大学学报（自然科学版）， 2018， 39（3）： 8388.

LI Dan, BIAN Yanxin, PENG Hongrui, et al. Preparation and electrochemical properties of spherical LiNi06Co02Mn02O2\[J\]. Journal of Qingdao University of Science and Technology（Natural Science Edition), 2018, 39(3)： 8388.

Preparation and Electrochemical Properties of Spherical LiNi06Co02Mn02O2

LI Dan, BIAN Yanxin, PENG Hongrui, LI Guicun

(College of Materials Science and Engineering，Qingdao University of Science and technology，Qingdao 266042，China)

Abstract: Spherical LiNi06Co02Mn02O2 with layered structures have been synthesized via hightemperature solid state reaction between spherical Ni06Co02Mn02(OH)2 precursor obtained by coprecipitation method and LiOH·H2O. Scanning electron microscopy（SEM） images of spherical Ni06Co02Mn02(OH)2 precursor formed at different reaction time indicate that spherical Ni06Co02Mn02(OH)2 precursor tends to be formed by the agglomeration of innumerable small nanosheet with radial distribution. The formation of the spherical Ni06Co02Mn02(OH)2 precursor went through a process from loose to tight. After lithiation at high temperature, the primary structure of LiNi06Co02Mn02O2changed from nanosheet to nanoparticle, but the spherical morphology of the secondary LiNi06Co02Mn02O2particles were maintained. Xray diffraction (XRD) test results indicate that the spherical LiNi06Co02Mn02O2 possess the more integrated layer structure than the common LiNi06Co02Mn02O2 synthesized by the solgel method. When used as cathode material for lithiumion batteries, the assynthesized spherical LiNi06Co02Mn02O2 exhibit remarkably enhanced electrochemical performances with higher capacity, excellent cycling stability, and better rate capability, compared with the common LiNi06Co02Mn02O2. Spherical LiNi06Co02Mn02O2 achieves a high discharge capacity of 1862 mA·h·g-1 at 02 C(1 C=160 mA·g-1),1589 mA·h·g-1 at 05 C and 1290 mA·h·g-1 at 1 C with 889% capacity retention after 100 cycles.

Key words: Liion batteries; cathode materials; electrochemical performance; LiNi06Co02Mn02O2

收稿日期：    20170227

基金项目： 国家自然科学基金项目（51272113，51672146）.

作者简介： 李丹(1992—)，女，硕士研究生.* 通信联系人.