摘要
用高温固相法二次烧结制备了锂离子电池正极材料尖晶石LiMn2O4。利用XRD、EDS和SEM等方法及激光粒度分析仪,研究了LiMn2O4的晶体结构、粒径及形貌与电化学性能的关系。与一次烧结的样品比较,二次烧结的样品粒径分布更集中于25～35μm,结晶更完全,电化学性能及循环稳定性更好。二次烧结后掺杂Zn(Ac)2的样品,在常温和高温(55℃)下的首次放电比容量分别为112.8mAh/g和113.5mAh/g,经过50次循环后,容量保持率分别为99.7%(常温)和94.5%(高温,55℃)。
Li-ion battery used cathode material spinel LiMn2O4 was prepared by high temperature solid-state method with twostep sintering. The relations between crystal structure,particle size, morphology and electrochemical performance of LiMn2O4 were studied by XRD, EDS and SEM methods and laser granular distribution analyzer. Comparing with the one-step sintering sample, the two-step sintering sample had narrower particle size distribution in 25 - 35 μm, more perfected crystallinity, better electrochemical performance and cycle stability. The initial specific discharge capacities of the two-step sintering sample doped Zn（Ac）2 at normal temperature and high temperature （55 ℃ ） were 112.8 mAh/g and 113.5 mAh/g, respectively, the capacity retention was 99.7 % （ normal temperature） and 94.5 % （high temperature, 55 ℃ ） after 50 cycles.
出处
《电池》
CAS
CSCD
北大核心
2007年第6期425-427,共3页
Battery Bimonthly
关键词
LIMN2O4
二次烧结
晶体结构
电化学性能
LiMn2O4
two-step sintering
crystal structure
electrochemical performance
