Abstract: In view of the application of lithium-ion batteries in electrical energy storage systems, three kinds of main cathode materials of lithium-ion batteries, i.e. rock-salt LiCoO₂, spinel-type LiMn₂O₄ and olivine-type LiFePO₄ are studied in the aspects of their electrochemical and security performance as well as their costs. The existing problems and application prospects of different types of lithium-ion batteries in electrical energy storage systems are revealed, which concludes that LiMn₂O₄ and LiFePO₄ are right choices for power-type and energy-type applications, respectively.

Key words: lithium-ion battery, cathode material, energy storage