尖晶石型Li_4Mn_5O_(12)正极材料的合成  

Synthesis of Spinel Li_4Mn_5O_(12) Cathode Materials

作　　者：周惠[1] 王浪[1] 姜祥祥[1] 蔡斌[1] 童庆松[1] 

机构地区：[1]福建师范大学化学与化工学院,福建福州350007

出　　处：《吉林化工学院学报》2014年第1期84-88,共5页Journal of Jilin Institute of Chemical Technology

基　　金：福建省科技厅重点项目(2010I0005);科技部科技人员服务企业项目(2009GJC40003)

摘　　要：以LiOH·H2O和MnCO3为原料,采用两段固相法制备了亚微米级大小的尖晶石型Li4Mn5O12正极材料.通过充放电测试、X射线衍射、扫描电镜等现代实验方法研究了合成温度对材料的电化学性能的影响.研究表明:500℃烧结制备的样品表现出最佳的电化学性能.在0.2 C倍率电流条件下,第1循环和第30循环的放电容量分别为143.5 mAh·g-1和143.9 mAh·g-1;在2 C倍率电流下,样品的第1循环和第50循环的放电容量分别为109.2 mAh·g-1和126.1 mAh·g-1.Spinel Li4Mn5O12 cathode material with submicron size was prepared with the two-phase solid state sintering method by using LiOH · H2O and MnCO3 as the starting materials. Several modem advanced techniques ,such as charge-discharge test, X-ray diffraction, scanning electron microscopy were employed to investigate the effects of sintering temperature on the electrochemical performance of the as-prepared samples. The results showed that the sample prepared at 500 ℃ delivered the best electrochemical performance. It exhibited the capacity of 143.5 mAh ·g^-1 in the 1st cycle and the capacity of 143.9 mAh·g^-1 in the 30th cycle while discharged at the 0.2 C rate,and the capacity of 109.2 mAh ·g^-1 in the 1st cycle and 126.1 mAh ·g^-1 in the 50th cycle while discharged at the 2 C rate.

关 键 词：两段固相法 Li4Mn5O12 尖晶石 烧结温度 

分 类 号：TM912[电气工程—电力电子与电力传动] O614.711[理学—无机化学]