锂离子电池正极钴酸锂研究进展

钴酸锂由于其高压实密度,高能量密度、优异的的循环寿命和安全可靠性,仍然是便携式电子用锂离子电池正极主要材料.随着消费类电子产品对锂离子电池续航能力的要求不断提高,钴酸锂的充电截止电压不断提高,以实现更高的能量密度.然而,随着充电截止电压不断提高,钴酸锂正极的缺陷也不断暴露,例如颗粒表界面稳定性下降、不可逆相变以及在高电...

Research progress of Lithium cobalt oxide cathode for Lithium ion battery

Lithium cobalt oxide is still the cathode material for Portable electronic equipment due to high pressure density,high energy density,excellent cycle life and safety.With the increasing requirements of lithium-ion battery in portable electronic products,the charging cut-off voltage of Lithium cobalt oxide is increasing to achieve higher energy density.However,with the continuous increase of the charging cut-off voltage,the defects of Lithium cobalt oxide are constantly exposed,such as the decrease of surface stability,irreversible phase transition and uneven reaction at high voltage,which will affect the capacity,coulombic efficiency and cycle life.Therefore,this paper reviews the effective mechanism and improvement methods of Lithium cobalt oxide under high voltage.