低温熔盐燃烧法制备LiMn_2O

稀有金属材料与工程, 2009, 38(z2): 22-25.

低温熔盐燃烧法制备LiMn_2O_4

刘贵阳 ^1, , 刘杰 ^2, , 何英 ^3, , 王宝森 ^4, , 翟风瑞 ^5, , 郭俊明 ^6, , 陈克新 ^7,

1.红河学院,云南,蒙自,661100

2.红河学院,云南,蒙自,661100

3.红河学院,云南,蒙自,661100

4.红河学院,云南,蒙自,661100

5.红河学院,云南,蒙自,661100

6.红河学院,云南,蒙自,661100;云南民族大学,云南,昆明,650031

7.清华大学,北京,100084

基金项目: 国家自然科学基金重大研究计划面上项目(90610011) 云南省自然科学基金(2006E0091M)

关键词：低温熔盐燃烧法 , 尖晶石型LiMn_2O_4 , 锂离子电池 , 正极材料 , 燃料

Preparation of LiMn_2O_4 by Low Temperature Molten-Combustion Method

Liu Guiyang ^1, , Liu Jie ^2, , He Ying ^3, , Wang Baosen ^4, , Zhai Fengrui ^5, , Guo Junming ^6, , Chen Kexin ^7,

1.红河学院,云南,蒙自,661100

2.红河学院,云南,蒙自,661100

3.红河学院,云南,蒙自,661100

4.红河学院,云南,蒙自,661100

5.红河学院,云南,蒙自,661100

6.红河学院,云南,蒙自,661100;云南民族大学,云南,昆明,650031

7.清华大学,北京,100084

Keywords： low temperature molten-combustion method , spinel LiMn_2O_4 , lithium-ion batteries , cathode materials , fuel

采用一种新的低温熔盐燃烧法制备尖晶石型LiMn_2O_4物质.研究了在550℃时草酸和柠檬酸为燃料对燃烧产物物相组成及其电性能的影响.结果表明,燃烧产物的主晶相为LiMn_2O_4,含有Mn_2O_3杂质.在Li:Mn:草酸=1:2:0～1.5(摩尔比)时,草酸对燃烧产物纯度影响不大,Li:Mn:草酸=1:2:2.0时,产物纯度降低,柠檬酸对产物纯度影响较大,燃烧产物随柠檬酸用量增加先升高后降低;在Li:Mn:柠檬酸=1:2:0.5时所得产物纯度最高,其放电容量达到121 mAh/g,但循环性能不是很理想.

A new low temperature molten-combustion method was introduced to prepare spinel LiMn_2O_4. The effects of oxalic acid and citric acid as fuels on the phase composition and electrochemical performance of products were studied. The results indicated that the main phase of products was LiMn_2O_4, and the impurity phase was Mn_2O_3. The effect of oxalic acid as fuel on the products was not obvious at the molar ratio of Li:Mn:oxalic acid=1:2:0～1.5(molar ratio), but at Li:Mn:oxalic acid=1:2:2.0, the purity of the product decreased. However the effect of citric acid on the products was obvious. The purity of products increased when using small amount of citric acid, but decreased with increasing citric acid content. The purest product was obtained at Li:Mn:Citric acid=1:2:0.5, which had the capacity of 121mAh/g, but the cyclic performance was not good.

参考文献

[1]	Chung H T;Myung S T;Cho T H et al.[J].Journal of Power Sources,2004,97-98:454.
[2]	Liu W;Kowal K;Farrington G C .[J].Journal of the Electrochemical Society,1998,145(02):459.
[3]	Kalyani P;Kalaiselvi N;Muniyandi N .[J].Journal of Power Sources,2002,111:232.
[4]	Rao M M;Liebenow C;Jayalakshmi M.[J].Journal of Solid State Electrochemistry,2001(05):348.
[5]	Han Y S;Kim H G .[J].Journal of Power Sources,2000,88:161.
[6]	刘贵阳,郭俊明,戴志福,张黎黎,陈克新,周和平.柠檬酸对液相燃烧合成尖晶石型LiMn2O4的影响[J].稀有金属材料与工程,2007(z1):115-117.
[7]	Han C H;Hong Y S;Park C M et al.[J].Journal of Power Sources,2001,92(1-2):95.
[8]	Kovacheva D;Gadjov H;Petrov K et al.[J].Journal of Materials Chemistry,2002,12:1184.
[9]	戴志福,刘贵阳,王宝森,郭德伟,黄兆龙,郭俊明.醋酸盐-葡萄糖体系溶液燃烧合成尖晶石型LiMn2O4研究[J].功能材料,2008(02):254-256,260.
[10]	印永嘉.大学化学手册[M].济南:山东科学技术出版社,1985:781.
[11]	Choi S;Manthiram A .[J].Journal of the Electrochemical Society,2000,147(05):1623.
[12]	Fey G T;Cho D U;Kumar T P .[J].Materials Chemistry and Physics,2006,99:451.

上一张下一张

计量

下载量()
访问量()

作者相关

文章评分

您的评分：
1

0%
2

0%
3

0%
4

0%
5

0%

材料期刊网