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| 1 | Modification of LiCo_(1/3)Ni_(1/3)Mn_(1/3)O_2 cathode material by CeO_2-coating显示文摘LiCo1/3Ni1/3Mn1/3O2 was coated by a layer of 1.0 wt% CeO2 via sol-gel method. The bared and coated LiMn1/3Co1/3Ni1/3O2 was characterized by X-ray diffraction (XRD),scanning electron microscopy (SEM),cyclic voltammogram (CV) and galvanotactic charge-discharge test. The results show that the coating layer has no effect on the crystal structure,only coating on the surface; the 1.0 wt% CeO2-coated LiCo1/3Ni1/3Mn1/3O2 exhibits better discharge capacity and cycling performance than the bared LiCo1/3Ni1/3Mn1/3O2. The discharge capacity of 1.0 wt% CeO2-coated cathode is 182.5 mAh.g-1 at a current density of 20 mA.g-1,in contrast to 165.8 mAh.g-1of the bared sample. The discharge capacity retention of 1.0 wt% CeO2-coated sample after 12 cycles reaches 93.2%,in comparison with 86.6% of the bared sample. CV results show that the CeO2 coating could suppress phase transitions and prevent the surface of cathode material from direct contact with the electrolyte,thus enhance the electro-chemical performance of the coated material. | WANG Meng,WU Feng,SU YueFeng & CHEN Shi Beijing Key Laboratory of Environment,School of Chemical Engineering and Environment,Beijing Institute of Technology National Development Center of High Technology Green Materials,Beijing 100081,China | 2009 | Science China(Technological Sciences)2009，52，9： | 7 |
| 2 | CeO_2对锂离子电池正极材料LiMn_(1/3)Co_(1/3)Ni_(1/3)O_2的包覆改性显示文摘采用溶胶凝胶法对LiMn1/3Co1/3Ni1/3O2表面包覆了1.0wt%的CeO2.采用X射线衍射(XRD),扫描电镜(SEM),循环伏安(CV)和恒流充放电对包覆和未包覆的LiMn1/3Co1/3Ni1/3O2进行了结构表征与性能测试分析.研究显示,CeO2并没有改变电极材料的晶体结构,仅在电极材料表面形成均匀的包覆层.包覆1.0wt%CeO2后的材料的放电容量和循环性能均明显优于未包覆的材料.在20mA·g-1的电流密度下,包覆1.0wt%CeO2后的材料的放电容量为182.5mAh·g-1而未包覆的材料仅为165.8mAh·g-1.包覆1.0wt%CeO2后的材料在3.0C下循环12周后的容量保持率达93.2%,而未包覆的材料的容量保持率仅为86.6%.CV测试表明,CeO2包覆层可以有效的防止正极材料与电解液的直接接触,抑制了材料结构的转变或抑制了与电解液的副反应,从而提高了材料的电化学性能. | 王萌 吴锋 苏岳锋 陈实 | 2009 | 中国科学(E辑)2009，39，4： | 7 |
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