EXCELLENT ELECTROCHEMICAL BEHAVIOR OF LiMn2O4 IN AQUEOUS ELECTROLYTE

LiMn2O4 was prepared by a solid-state reaction, and for the first time its electrochemical behavior in the organic and aqueous electrolytes were compared. Since the host structure is the same, the intercalation and deintercalation behavior does not change, and the diffusion coefficient of Li+ ions are in the same range. However, due to much higher ionic conductivity of the aqueous electrolyte, its reversible redox behavior at high scan rate is much better than in the organic electrolyte. The reversible capacity in the aqueous electrolyte is 85mAh.g(-1) at the current density of 50mA.g(-1), and 22mAh.g(-1) (26% of the normal capacity) when the current density is up to 10,000mA.g(-1) (118 C). This shows that aqueous rechargeable lithium battery (ARLB) have very high-power density or excellent rate capability, and good cycling behavior.