Comparison of LiNi0.5Mn1.5O4 cathode materials prepared by different coprecipitation methods

摘要：

LiNi0.5Mn1.5O4 was synthesized by two different coprecipitation methods: composite carbonate process and composite hydroxide method.The effects of calcination temperature of precursors on the physical properties and electrochemical performance of the samples were investigated.The results of scanning electron microscopy(SEM) show that as calcination temperature increases,the crystallinity of the samples is improved,and their grain sizes are obviously increased.X-Ray diffraction(XRD) data show that the LiNi0.5Mn1.5O4 compounds obtained by two coprecipitation methods both exhibit a pure cubic spinel structure without any impurities.Furthermore,it is found that the samples prepared with relatively high temperature precursors present large initial discharge capacity (＞125 mA·h/g) and excellent cycling stability with a capacity retention rate larger than 91％ after 30 cycles at current density of 1 C.This probably derives from their higher crystallinity and larger grain sizes.However,the initial discharge capacity of LiNi0.5Mn1.5O4 synthesized by composite carbonate process is smaller than that prepared by composite carbonate process,but it shows better capacity retention ability.

关键词： lithium ion battery LiNi0.5Mn1.5O4 coprecipitation method precursor spinel

作者: SUN Qiang WANG Zhi-xing LI Xin-hai GUO Hua-jun PENG Wen-jie

作者单位: School of Metallurgical Science and Engineering,Central South University,Changsha 410083,China

会议类型: 国际会议

会议名称: 2007年国际有色金属大会(International Conference of Nonfereous Materials 2007)(ICNFM)

会议地点: 长沙

会议语种:英文

在线出版日期: 2007-11-28（万方平台首次上网日期，不代表论文的发表时间）