通过氧化还原法在室温下制备出球形MnO2前驱体,以LiOH·H2O为锂源,按照一定锂锰摩尔比混合,在750℃下焙烧8h,得到球形尖晶石LiMn2O4.采用X射线衍射和扫描电镜对MnO2和LiMn2O4进行了表征,并对LiMn2O4样品在室温和高温下作了充放电性能测试.结果表明:合成的样品以球形颗粒存在,粒度大小均匀,分散性和流动性好;室温和高温条件下首次放电比容量分别为128.2和125.0mAh/g,50次循环后容量保持率分别为90%和68%,球形LiMn2O4在室温和高温下均具有较高的比容量和优良的循环性能.
参考文献
| [1] | Motoharu Saitoh;Mitsuru Sano;Miho Fujita .Studies of Capacity Losses in Cycles and Storages for a Li_(1.1)Mn_(1.9)O_4 Positive Electrode[J].Journal of the Electrochemical Society,2004(1):A17-A22. |
| [2] | Hon Y M;Chung H Y;Fung K Z et al.[J].Journal of Solid State Chemistry,2001,160:368-376. |
| [3] | Calvin J. Curtis;Jiaxiong Wang;Douglas L. Schulz .Preparation and Characterization of LiMn_2O_4 Spinel Nanoparticles as Cathode Materials in Secondary Li Batteries[J].Journal of the Electrochemical Society,2004(4):A590-A598. |
| [4] | 应皆荣,高剑,姜长印,万春荣,何向明.控制结晶法制备球形锂离子电池正极材料的研究进展[J].无机材料学报,2006(02):291-297. |
| [5] | Ying J R;Jiang C Y;Wan C R .[J].Journal of Power Sources,2004,129:264-269. |
| [6] | He XM;Li JJ;Cai Y;Jiang CY;Wan CR .Preparation of spherical spinel LiMn2O4 cathode material for Li-ion batteries[J].Materials Chemistry and Physics,2006(1):105-108. |
| [7] | 李嵩,程杰锋,季世军,孙俊才.溶胶凝胶法合成尖晶石型Li1+xMn2-xO4的工艺优化[J].中国有色金属学报,2002(04):729-732. |
| [8] | He X M;Li J J;Cai Y et al.[J].Journal of Power Sources,2005,150:216-222. |
上一张
下一张
上一张
下一张
计量
- 下载量()
- 访问量()
文章评分
- 您的评分：
-
10%
-
20%
-
30%
-
40%
-
50%