Al_(2)O_(3)包覆LiNi_(0.5)Mn_(1.5)O_(4)材料的制备及性能  

Preparation and performance of Al_(2)O_(3)coated LiNi_(0.5)Mn_(1.5)O_(4)material

作　　者：常丽娟 詹彬鑫 殷志刚 徐川 CHANG Lijuan;ZHAN Binxin;YIN Zhigang;XU Chuan(Tianqi Xinlong Technology(Chengdu)Co.,Ltd.,Chengdu 610000,Sichuan,China;Tianqi Lithium Corporation,Chengdu 610213,Sichuan,China;Key Laboratory of Lithium Resources and Materials of Sichuan Province,Chengdu 610213,Sichuan,China)

机构地区：[1]天齐鑫隆科技(成都)有限公司,四川成都610000 [2]天齐锂业股份有限公司,四川成都610213 [3]锂资源与锂材料四川省重点实验室,四川成都610213

出　　处：《电池》2025年第2期279-284,共6页Battery Bimonthly

基　　金：四川省自然科学基金面上项目(2024NSFSC0212)。

摘　　要：为得到性能优良的Al_(2)O_(3)包覆LiNi_(0.5)Mn_(1.5)O_(4)材料,采用共沉淀法制备LiNi_(0.5)Mn_(1.5)O_(4),再用液相表面包覆工艺包覆Al_(2)O_(3)。利用SEM、XRD、动态光散射(DLS)和BET比表面积测试等对材料的微观形貌、结构、粒度分布和比表面积进行分析,利用恒流充放电测试研究电化学性能。Al_(2)O_(3)包覆可提升LiNi_(0.5)Mn_(1.5)O_(4)材料在集流体表面的附着力、缓解充放电过程中因体积变化造成的活性物质损失,提高电子导电性、增加电极稳定性。在2.5~5.0 V充放电,Al_(2)O_(3)包覆LiNi_(0.5)Mn_(1.5)O_(4)材料的5.00 C放电比容量为121.11 mAh/g,1.00 C循环1500次的容量保持率为88.75%。In order to obtain Al_(2)O_(3)coated LiNi_(0.5)Mn_(1.5)O_(4)materials with better performance,LiNi_(0.5)Mn_(1.5)O_(4)is prepared by co-precipitation method and then coating Al_(2)O_(3)through liquid-phase surface coating process.The morphology,structure,particle size distribution and specific surface area of the samples are analyzed by SEM,XRD,dynamic laser scattering(DLS)and BET specific surface area tests.The electrochemical performance is investigated using the galvanostatic charge-discharge test.Coating Al_(2)O_(3)improves the adhesion of LiNi_(0.5)Mn_(1.5)O_(4)material on current collector surface,relieves the loss of active material due to volume change during the charge-discharge process,enhances electronic conductivity,increases electrode stability.When charged-discharged in 2.5-5.0 V,Al_(2)O_(3)coated LiNi_(0.5)Mn_(1.5)O_(4)material demonstrates a specific discharge capacity of 121.11 mAh/g at 5.00 C and a capacity retention rate of 88.75%after 1500 cycles at 1.00 C.

关 键 词：正极材料 LiNi_(0.5)Mn_(1.5)O_(4) Al_(2)O_(3)包覆 锂离子电池 共沉淀 液相表面包覆 

分 类 号：TM912.9[电气工程—电力电子与电力传动] TD98[矿业工程—选矿]