用LiMn2O4和碳酸锂制备了锂改性的锰酸锂产物,循环性能和比容量测试结果表明随着碳酸锂加入量的增加,循环稳定性逐渐增强,而比容量有逐渐下降的趋势.循环伏安测试结果表明,LiMn2O4及其改性产物具有两对氧化还原峰.随着碳酸锂加入量的增加,两对氧化峰和还原峰峰电位差呈逐渐下降趋势,说明了锂脱嵌的可逆性越来越好;氧化(或还原)峰之间的分形变得不明显,峰形逐渐宽化,说明锂离子两步脱嵌过程变得越来越不明显.研究表明锂离子脱出和嵌入的总量随着碳酸锂量的增加而减少.XRD结果显示,随着碳酸锂加入量的增大,晶格常数逐渐降低,晶格逐渐收缩,结构稳定性增强.
参考文献
| [1] | 黄松涛,曹松,阚素荣,储茂友,卢世刚,沈剑韵.掺Co3+和Li+的LiMn2O4晶体结构和电化学性能研究[J].稀有金属,2006(02):129-133. |
| [2] | 尖晶石锰酸锂的组成对其结构和性能的影响[J].材料研究学报,2005(04):349-353. |
| [3] | Yang S T;Jia J H;Ding L et al.Studies of structure and cycleability of LiMn2O4 and LiNd0 01Mn1 99O4 as cathode for Li-ion batteries[J].Electrochimica Acta,2003,48:569. |
| [4] | Hwang B J;Santhanam R;Hu S G .Synthesis and characterization of multidoped lithium manganese oxide spinel,Li1.02Co0.1Ni0.1Mn1.8O4,for rechargeable mithium batteries[J].Journal of Power Sources,2002,108:250. |
| [5] | Nieto S;Majumder S B;Katiyar R S .Improvement of the cycleability of nano-crystalline lithium manganate cathodes by cation co-doping[J].Journal of Power Sources,2004,136(01):88. |
| [6] | 余丹梅,陈昌国,朱伟,张苏红.掺钒尖晶石型LiVxMn2-xO4的合成和性能[J].重庆大学学报(自然科学版),2004(05):51-53. |
| [7] | Kock A De;Ferg E;Gummow R J .The effect of multivalent cation dopants on lithium manganese spinel cathodes[J].Journal of Power Sources,1998,70:247. |
| [8] | Googenough J B;Thackeray M M;David W I F et al.Lithium insertion/extraction reactions with manganese oxides[J].Revue de Chimie Minerale,1984,21:435. |
| [9] | Mosbah A;Verbaere A;Tournoux M .Phases LixMnO2 rattachees au type spinelle[J].Materials Research Bulletin,1983,18:1375. |
| [10] | 郭炳焜;徐微;王先友;肖立新.锂离子电池[M].长沙:中南大学出版社,2002 |
| [11] | 藤(山乌)昭.电化学测定方法[M].北京:北京大学出版社,1995 |
| [12] | Ma S;Hoguchi H;Yoshio M .Cyclic voltammtric study on stoichiometric spinel LiMn2O4 electrode at elevated temperature[J].Journal of Power Sources,2001,97-98:285. |
| [13] | 唐爱东,黄可龙,赵家昌.尖晶石型LiMn2O4电极循环伏安研究[J].电源技术,2003(06):502-504. |
| [14] | Hosoya M.;Wakihara M.;Ikuta H. .Single phase region of cation substituted spinel LiMyMn2-yO4-delta (M = Cr, Co and Ni) and cathode property for lithium secondary battery[J].Solid state ionics,1998(1/2):153-159. |
| [15] | Seung-Taek Myung;Shinichi Komaba;Naoaki Kumagai .Enhanced Structural Stability and Cyclability of Al-Doped LiMn_2O_4 Spinel Synthesized by the Emulsion Drying Method[J].Journal of the Electrochemical Society,2001(5):A482-A489. |
| [16] | Robertson A D;Lu S H;Howard W F et al.M3+-modified LiMn2O4 spinel intercalation cathodes Ⅱ electrochemical stabilization by M3+[J].Journal of the Electrochemical Society,1997,10:3503. |
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%