TWO-STEP SOL-GEL SYNTHESIS OF MESOPOROUS LI2MNSIO4/C NANOCOMPOSITE WITH IMPROVED ELECTROCHEMICAL PERFORMANCE FOR LITHIUM-ION BATTERIES
The safety and the energy density of lithium-ion batteries are the main hindrance for their applications in electric vehicles. Thus, the cathode materials with larger specific capacity and higher discharge potential are necessary to be developed. Li2MnSiO4, a kind of polyanion-type cathode material with high safety, has two lithium ions per formula unit. It provides a theoretical specific capacity of 333.1 mAh g-1. Besides, the discharge potential of Li2MnSiO4 is as high as 4.1 and 4.5 V (vs. Li/Li+) corresponding to two Li+ insertion, respectively 1. Thus, U2MnSiO4 is a kind of high energy density and safety cathode material. However, the poor electronic conductivity of 10-16 S cm-1 at room temperature 2, collapse of the crystal structure occurred in the initial charge process 2, 3, and the volume change during charge-discharge process 4 make detrimental effects on the electrochemical performance of Li2MnSiO4.
lithium manganese silicate sol-gel preparation lithium-ion battery cathode material
Fuqing Wang Jian Chena Baolian Yia
Laboratory of Advanced Rechargeable Batteries, Dalian Institute of Chemical Physics, Chinese Academy of Sciences, Dalian 116023, China Graduate University of the Chinese Academy of Sciences, Beijing 100039, China
国际会议
大连
英文
114-115
2012-05-28（万方平台首次上网日期，不代表论文的发表时间）