沉淀剂对LiNi_(0.5)Mn_(1.5)O_(4)材料结构及电性能的影响  

Effect of precipitant on structure and electrical properties of LiNi_(0.5)Mn_(1.5)O_(4)materials

作　　者：周国江 樊军花 周扬 刘光 张秀阳 Zhou Guojiang;Fan Junhua;Zhou Yang;Liu Guang;Zhang Xiuyang(School of Environmental&Chemical Engineering,Heilongjiang University of Science&Technology,Harbin 150022,China;School of Materials Science&Engineering,Heilongjiang University of Science&Technology,Harbin 150022,China)

机构地区：[1]黑龙江科技大学环境与化工学院,哈尔滨150022 [2]黑龙江科技大学材料科学与工程学院,哈尔滨150022

出　　处：《黑龙江科技大学学报》2024年第3期374-379,共6页Journal of Heilongjiang University of Science And Technology

基　　金：黑龙江省教育厅省属高科技成果研发、培育项目(TSTAU-C2018004)。

摘　　要：为研究沉淀剂对锂离子电池正极材料镍锰酸锂性能的影响,选用Na_(2)CO_(3)、CO(NH_(2))_(2)、NaHCO_(3)和NH_(4)HCO_(3)为沉淀剂,通过水热-熔盐法制备镍锰酸锂材料。采用X射线衍射、傅里叶变换红外光谱、扫描电子显微镜和X射线光电子能谱对材料进行物理表征,测试材料的电化学性能。结果表明,以Na_(2)CO_(3)为沉淀剂制备的镍锰酸锂材料Mn^(3+)含量少、结晶度高、颗粒分布均匀且尺寸小,结构最为稳定。Na_(2)CO_(3)-LNMO样品在1 C下放电比容量为122.87 mAh/g,循环200次后容量保持率为93.17%,具有最佳的电化学性能。This paper aims to study the effect of precipitant on the performance of LiNi_(0.5)Mn_(1.5)O_(4)cathode materials of lithium ion batteries by taking Na_(2)CO_(3),CO(NH_(2))2,NaHCO_(3)and NH_(4)HCO_(3)as precipitants to prepare LiNi_(0.5)Mn_(1.5)O_(4)materials with hydrothermal-molten salt method.The study is accomplished by characterizing the materials with X-ray diffraction,Fourier transform infrared spectroscopy,scanning electron microscopy and X-ray photoelectron spectroscopy;and testing the electrochemical properties of the materials.The results show that the lithium nickel manganese oxide material prepared with Na_(2)CO_(3)as precipitant has less Mn^(3+)content,high crystallinity,uniform particle distribution and small size,and exhibits the most stable structure.The Na_(2)CO_(3)-LNMO sample has a discharge specific capacity of 122.87 mAh/g at 1 C and a capacity retention rate of 93.17%after 200 cycles,which has the best electrochemical performance.

关 键 词：锂离子电池 正极材料 镍锰酸锂 水热-熔盐法 

分 类 号：TQ152[化学工程—电化学工业]