Abstract: The high-capability LiNi0.5Mn1.5O4 was synthesized by using high temperature to roast the precursor of the traditional sol-gel method.The crystal structure was tested by X-ray diffraction.The structure of the samples which was roasted at high temperature was perfect.The cycle capability was significantly improved after being roasted at high temperature.The first charge-discharge capacity of the sample which is roasted at 900 ℃ is about 123 mAh/g and it is 121.6 mAh/g after circulated 100 cycles at 1 C and the rate of capacity retention is 98.9;.The cycle capability was improved obviously after being roasted at high temperature.

Key words: The high-capability LiNi0.5Mn1.5O4 was synthesized by using high temperature to roast the precursor of the traditional sol-gel method.The crystal structure was tested by X-ray diffraction.The structure of the samples which was roasted at high temperature was perfect.The cycle capability was significantly improved after being roasted at high temperature.The first charge-discharge capacity of the sample which is roasted at 900 ℃ is about 123 mAh/g and it is 121.6 mAh/g after circulated 100 cycles at 1 C and the rate of capacity retention is 98.9;.The cycle capability was improved obviously after being roasted at high temperature.