稀土镧掺杂层状锰酸锂正极材料的制备与性能

稀有金属材料与工程, 2008, 37(4): 709-712.

稀土镧掺杂层状锰酸锂正极材料的制备与性能

赵桂网 ^1, , 何建平 ^2, , 张传香 ^3, , 潘科亮 ^4, , 周建华 ^5,

1.南京航空航天大学,江苏,南京,210016

2.南京航空航天大学,江苏,南京,210016

3.南京航空航天大学,江苏,南京,210016

4.南京航空航天大学,江苏,南京,210016

5.南京航空航天大学,江苏,南京,210016

基金项目: 江苏省高新技术项目(BG2005009)

关键词：层状LiMnO2 , 溶胶凝胶法 , 稀土掺杂

Synthesis and Performances of Layered Lithium Manganese Oxides of Rare Earth Doped Cathode Materials

采用溶胶凝胶法制备层状LiMnO2,并掺杂不同比例的稀土元素进行改性.XRD分析结果表明,掺杂镧元素的层状锰酸锂呈斜方晶系,纯度较高.SEM照片显示这种产物为层状结构,且粒度大小分布较为均匀.用循环充放电测试考察了产物的电化学性能,结果显示掺杂6%La的层状锰酸锂正极材料的初次放电比容量为128 mAh/g,但循环稳定性较差;而掺杂了4%La的层状锰酸锂则表现了良好的循环稳定性,首次放电比容量达到了102 mAh/g,多次充放电之后容量基本没有衰减,仍然能保持较高的比容量.从交流阻抗数据分析,掺镧量为4%的样品扩散阻抗较小,充放电可逆性较好.

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材料期刊网

稀土镧掺杂层状锰酸锂正极材料的制备与性能

Synthesis and Performances of Layered Lithium Manganese Oxides of Rare Earth Doped Cathode Materials

参考文献