引用本文:
王洪, 祝纶宇, 陈鸣才. 锂离子电池正极材料LiCoO2的包覆改性[J]. 应用化学,
2007, 24(5): 556-560.
Citation: WANG Hong, ZHU Lun-Yu, CHEN Ming-Cai. Modification of LiCoO2 Cathode Material by Surface Coating[J]. Chinese Journal of Applied Chemistry, 2007, 24(5): 556-560.
Citation: WANG Hong, ZHU Lun-Yu, CHEN Ming-Cai. Modification of LiCoO2 Cathode Material by Surface Coating[J]. Chinese Journal of Applied Chemistry, 2007, 24(5): 556-560.
锂离子电池正极材料LiCoO2的包覆改性
摘要:
以Mg-PAA为原料,采用溶液法在LiCoO2表面包覆一层均匀稳定的MgO层。用X射线衍射、扫描电子显微镜和俄歇能谱等测试技术对包覆前后的LiCoO2的结构和性能进行了表征。结果表明,处理后在LiCoO2的表面形成了LiCo1-xMgxO2固溶液,此固溶液保护层减少了LiCoO2和电解液直接接触,有效地抑制了LiCoO2与电解液的相互作用。经表面修饰处理后,LiCoO2正极材料的结构有序度、稳定性及材料的电化学性能均得到明显提高。处理LiCoO2所制电池在1C电流、4.3和4.4 V经100次循环,容量衰减只有5%和6.5%。
English
Modification of LiCoO2 Cathode Material by Surface Coating
Abstract:
A stable and uniform MgO layer was coated on the surface of LiCoO2 cathode material by solution method with Mg-PAA.A layer of LiCo1-xMgxO2 solid solution was formed at the interface between LiCoO2 and the MgO layer.The structure and performance of the MgO coated and uncoated LiCoO2 were characterized by means of XRD,SEM,AES.The results show that a solid electrolyte layer was formed on the surface of LiCoO2,which can reduce the direct contact between LiCoO2 and electrolyte,and thus effectively suppress the interaction between them.The structure stability,lattice distortion and cycle-reversibility at a high voltage for LiCoO2 can be improved obviously by the surface coating.There was only 5% or 6% capacity fading after 100 cycles for the battery with coated-LiCoO2 cathode.
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Key words:
- LiCoO2
- / coating
- / lithium ion battery
- / cathode material
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