用液相合成法合成出掺锂、镍的锂锰氧化物,用FT-IR、XRD、XPS对材料的结构及表面物质状态进行了表征,并研究了其在有机电解液中的电化学性能,实验结果表明:所合成出的样品具有典型的尖晶石的各衍射峰,但也是Ni-O杂晶相存在,样品表面中锰呈+4价,镍为+2和+3价的混合价,锰化合价的提高有利于晶胞收缩,稳定尖晶石的结构以及材料在深度放电时抑制Jahn-Teller效应的发生.样品的主要放电平台在4.5V以上,循环性能很好,适合做5V锂离子电池的正极材料.
参考文献
| [1] | 卫敏,路艳罗,杨文胜,段雪.锂离子二次电池锰系正极材料[J].化学通报,2002(08):516-526. |
| [2] | Hong K J;Sun Y K .Synthesis and electrochemical characteristics of LiCrxNi0.5-xMn1.5O4 spinel as 5V cathode materials for lithium secondary batteries[J].Journal of Power Sources,2002,109(02):427-430. |
| [3] | Amine K;Tukamoto H;Yasuda H et al.Preparation and electrochemical investigation of LiMn2-xMexO4(Me: Ni, Fe, and x=0.5,1) cathode materials for secondary lithium batteries[J].Journal of Power Sources,1997,68(02):604-608. |
| [4] | Ohzuku T;Takeda S;Iwanaga M .Solid redox potentials for Li O4 (Me:3d-transition metal) having spinelframework structures:a series of 5 volt materials for advanced lithium-ion batteries[J].Journal of Power Sources,1999,81(01):90-94. |
| [5] | Sigala C.;Verbaere A.;Piffard Y.;Tournoux M.;Guyomard D. .POSITIVE ELECTRODE MATERIALS WITH HIGH OPERATING VOLTAGE FOR LITHIUM BATTERIES - LICRYMN2-YO4 (0-LESS-THAN-OR-EQUAL-TO-Y-LESS-THAN-OR-EQUAL-TO-1)[J].Solid state ionics,1995(3/4):167-170. |
| [6] | 赖琼鈺;卢集政;郑宗和 .嵌入化合物LixMn2O4的水热合成研究[J].无机化学学报,1998,14(03):347-350. |
| [7] | Wu C.;Wu F.;Chen LQ.;Huang XJ.;Wang ZX. .Spectroscopic studies on cation-doped spinel LiMn2O4 for lithium ion batteries[J].Solid state ionics,2001(3/4):277-285. |
| [8] | 陈前火,童庆松,连锦明.5 V锂离子电池正极材料的制备和电化学性能研究[J].吉林化工学院学报,2003(03):5-9. |
| [9] | Kiyoshi Kanamura;Wataru Hoshikawa;Takao Umegaki .Electrochemical Characteristics of LiNi_(0.5)Mn_(1.5)O_4 Cathodes with Ti or Al Current Collectors[J].Journal of the Electrochemical Society,2002(3):A339-A345. |
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%