A modified Al2O3 coating process to enhance the electrochemical performance of Li(Ni1/3Co1/3Mn1/3)O-2 and its comparison with traditional Al2O3 coating process

作者：Huang Youyuan; Chen Jitao; Cheng Fuquan; Wan Wang; Liu Wen; Zhou Henghui^*; Zhang Xinxiang

来源：Journal of Power Sources, 2010, 195(24): 8267-8274.

DOI：10.1016/j.jpowsour.2010.07.021

• Lithium-ion batteries
• Lithium nickel cobalt manganese oxide
• Alumina coating
• Modification

Al2O3-modified Li(Ni1/3Co1/3Mn1/3)O-2 is synthesized by a modified Al2O3 coating process. The Al2O3 coating is carried out on an intermediate, (Ni1/3Co1/3Mn1/3)(OH)(2), rather than on Li(Ni1/3Co1/3Mn1/3)O-2. As a comparison, Al2O3-coated Li(Ni1/3Co1/3Mn1/3)O-2 also is prepared by traditional Al2O3 coating process. The effects of Al2O3 coating and Al2O3 modification on structure and electrochemical performance are investigated and compared. Electrochemical tests indicate that cycle performance and rate capability of Li(Ni1/3Co1/3Mn1/3)O-2 are enhanced by Al2O3 modification without capacity loss. Al2O3 coating can also enhance the cycle performance but cause evident capacity loss and decline of rate capability. The effect of Al2O3 coating and Al2O3 modification on kinetics of lithium-ion transfer reaction at the interface of electrode/electrolyte is investigated via electrochemical impedance spectra (EIS). The result support that the Al2O3 modification increase Li+ diffused coefficient and decrease the activation energy of Li+ transfer reaction but the traditional Al2O3 coating lead to depression of Li+ diffused coefficient and increase of activation energy.

• 出版日期2010-12-15
• 单位北京大学