锂离子电池正极材料LiNixCo1-2xMnxO2的制备及电化学性能

Synthesis and Electrochemical Performances of Cathode Material LiNixCo1-2xMnxO2 for Lithium-Ion Battery

摘要:

采用改进的高温固相法合成锂离子电池正极材料LiNixCo1-2xMnxO2。考察不同x值、不同Li/(Ni+Co+Mn)摩尔比、不同焙烧温度、不同煅烧时间对其电化学性能的影响并通过XRD对其结构进行表征。结果表明，提高Co含量可以改善材料的循环性能；当n(Li)/n(M)(M=Ni, Co, Mn)=1.10，在950~1000 ℃煅烧20 h时，可得到电化学性能优良的正极材料

Abstract:

The LiNixCo1-2xMnxO2 cathode materials for lithium-ion batteries were synthesized by an improved high temperature solid-state method. The effects of x values（x=0.20, 0.33, 0.40, 0.45, Li/（Ni+Co+Mn）molar ratios n(Li)/n(M)=(1.00, 1.05, 1.10, 1.15)，sintering temperatures（800, 900, 950, 1000 ℃）and sintering times (8, 12, 16, 20 h) on the performances of LiNixCo1-2xMnxO2 were studied and the structures of products were characterized by X-ray diffraction (XRD). The results showed that the cycling performance was improved for higher Co content. The cathode material with excellent electrochemical performance was obtained by sintering the mixed raw materials with n(Li)/n(M)=1.10 at 950~1000 ℃ for 20 h