沉淀剂对LiNi0.5Mn1.5O4材料结构及电性能的影响
Effect of precipitant on structure and electrical properties of LiNi0.5 Mn1.5 O4 materials
周国江 1樊军花 1周扬 2刘光 1张秀阳1
作者信息
- 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
- 折叠
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Na2CO3、CO(NH2)2、NaHCO3和NH4HCO3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Na2CO3为沉淀剂制备的镍锰酸锂材料Mn3+含量少、结晶度高、颗粒分布均匀且尺寸小,结构最为稳定.Na2CO3-LNMO样品在1C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.
Abstract
This paper aims to study the effect of precipitant on the performance of LiNi0.5Mn1.5O4 cathode materials of lithium ion batteries by taking Na2CO3,CO(NH2)2,NaHCO3 and NH4HCO3 as pre-cipitants to prepare LiNi0.5Mn1.5 O4 materials with hydrothermal-molten salt method.The study is accom-plished by characterizing the materials with X-ray diffraction,Fourier transform infrared spectroscopy,scanning electron microscopy and X-ray photoelectron spectroscopy;and testing the electrochemical prop-erties of the materials.The results show that the lithium nickel manganese oxide material prepared with Na2 CO3 as precipitant has less Mn3+content,high crystallinity,uniform particle distribution and small size,and exhibits the most stable structure.The Na2CO3-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Key words
lithium-ion battery/cathode material/LiNi0.5Mn1.5O4/hydrothermal-molten salt method引用本文复制引用
基金项目
黑龙江省教育厅省属高科技成果研发培育项目(TSTAU-C2018004)
出版年
2024
国家科技期刊平台
NSTL
万方数据