Investigation on the enhanced electrochemical performances of Li1.2Ni0.13Co0.13Mn0.54O2 by surface modification with ZnO

作者：Yu, Ruibing; Lin, Yingbin^*; Huang, Zhigao

来源：Electrochimica Acta, 2015, 173: 515-522.

DOI：10.1016/j.electacta.2015.05.084

• Lithium-ion batteries
• Lithium-rich cathode material
• Zinc oxide
• Surface modification

Li-rich Li1.2Ni0.13Co0.13Mn0.54O2 cathode material is synthesized via a sol-gel method and subsequently surface-modified with ZnO layer by a wet chemical process. The effect of ZnO-coating on the electrochemical performances of Li1.2Ni0.13Co0.13Mn0.54O2@ZnO cells is investigated systematically by the charge/discharge testing, cyclic voltammograms and AC impedance spectroscopy, respectively. In comparison with the bare Li1.2Ni0.13Co0.13Mn0.54O2, Li1.2Ni0.13Co0.13Mn0.54O2@ZnO demonstrates higher rate capability and better cyclability. Analysis from the electrochemical measurements reveals that the remarkably improved performances of the surface-modified composites is mainly ascribed to the smaller charge-transfer resistances, higher lithium diffusion rate and the stable electrolyte/ electrode interfacial structure due to the suppression of the electrolyte decomposition. Furthermore, it is interesting that the electrochemical performances of Li1.2Ni0.13Co0.13Mn0.54O2@ZnO might be related with the conductivity and oxygen vacancies of ZnO, which could be modulated via changing defects in ZnO by thermal annealing.

• 单位
  福建师范大学