5 V正极材料LiNi0.5Mn1.5O4的草酸共沉淀法合成及性能

Oxalate Coprecipitation Process Synthesis of 5 V Cathode Material LiNi0.5Mn1.5O4 and Its Performance

摘要:

通过草酸共沉淀法成功合成了5 V正极材料LiNi0.5Mn1.5O4，采用XRD、SEM、充放电试验和循环伏安法对合成产物进行表征。XRD和SEM分析结果表明，所合成的正极材料LiNi0.5Mn1.5O4具有立方尖晶石结构（空间群为Fdˉ3 m），结晶度高，粒度适中且比较均匀。电化学测试结果表明，合成产物具有优良的电化学性能，它仅在4.7 V附近有一个放电平台，0.1 C的放电容量高达133 mAh/g，50次循环后放电容量仍保持在128 mAh/g以上，1和3 C的放电容量在30次循环后也分别保持在122和101 mAh/g以上

Abstract:

5 V cathode material LiNi0.5Mn1.5O4 was synthesized via an oxalate co-precipitation process. The synthesized product was characterized by XRD, SEM, charge/discharge test and cyclic voltammetry. XRD and SEM results indicate that the synthesized product LiNi0.5Mn1.5O4 has cubic spinel structure with space group of Fdˉ3 m, high crystallinity, moderate and uniform particle size. The electrochemical experiment results show that the LiNi0.5Mn1.5O4 has excellent performances. It has only one discharge plateau at around 4.7 V. 0.1 C discharge capacity is up to 133 mAh/g and retains above 128 mAh/g after 50 cycles, 1 C and 3 C discharge capacities after 30 cycles also retain above 122 mAh/g and 101 mAh/g, respectively