| O2结构LixMn0.7Co0.3O2正极材料的可控制备及其电化学性能研究 |
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| 引用本文： | 陈冬梅,杨钰,张朝平. O2结构LixMn0.7Co0.3O2正极材料的可控制备及其电化学性能研究[J]. 材料导报, 2010, 24(10) |
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| 作者姓名： | 陈冬梅 杨钰 张朝平 |
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| 作者单位： | 贵州大学化学与化工学院,贵阳,550025;贵州大学化学与化工学院,贵阳,550025;贵州大学化学与化工学院,贵阳,550025 |
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| 基金项目： | 贵州大学自然科学青年科研基金 |
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| 摘 要： | 采用溶胶-凝胶法,通过控制Na/(Mn+Co)投料比,合成了层状P2结构的Nax Mn0.7Co0.3O2;以NaxMn0.7Co0.3O2 为前驱体,经离子交换反应得到层状O2结构LixMn0.7Co0.3O2,锂含量x达到0.9.电化学性能测试表明,随着锂含量的增加,可逆比容量逐渐增大,首次充电不可逆容量也明显增大,其中以Li0.9Mn0.7Co0.3O2的可逆比容量及首次不可逆比容量最高,且保持了良好的电化学循环稳定性.
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| 关 键 词： | 溶胶-凝胶法 离子交换 层状O2-LixMn0.7Co0.3O2 |
Controllable Synthesis and Electrochemical Characteristics of O2-Li_xMn_(0.7)Co_(0.3)O_2 Cathode Materials |
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| CHEN Dongmei,YANG Yu,ZHANG Chaoping. Controllable Synthesis and Electrochemical Characteristics of O2-Li_xMn_(0.7)Co_(0.3)O_2 Cathode Materials[J]. Materials Review, 2010, 24(10) |
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| Authors: | CHEN Dongmei YANG Yu ZHANG Chaoping |
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| Affiliation: | CHEN Dongmei,YANG Yu,ZHANG Chaoping(School of Chemistry , Chemical Engineering,Guizhou University,Guiyang 550025) |
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| Abstract: | Layered sodium manganese bronzes NaxMn0.7Co0.3O2 with the P2 structure are synthesized by the citric acid sol-gel method through controlling the atomic ratio Na/(Mn+Co). Bronzes NaxMn0.7Co0.3O2 precursors are used to prepare layered O2-LixMn0.7Co0.3O2 by molten salt ion exchange method,with a maximum Li content reachs 0.9. Electrochemical performance test shows that the reversible specific capacity of the layered LixMn0.7Co0.3O2 increases with Li content increasing,so does the irreversible capacity during t... |
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| Keywords: | sol-gel method ion exchange layered O2-LixMn0.7Co0.3O2 |
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