高性能锂电池材料Li4Ti5O12/C的制备与性能

分别以蔗糖、可溶性淀粉作为碳源,采用固相法在N2气氛中制备尖晶石结构的Li4Ti5O12/C复合正极材料,通过X射线衍射（XRD）,扫描电子显微镜（SEM）分析和电化学性能测试表征了Li4Ti5O12/C的晶体结构、表面形貌和电化学性能,结果表明,碳源的加入抑制了晶粒的生长,增大了材料的比表面积,增强了材料的电化学性能,其中,碳源为可溶性淀粉时,样品在0．1C下首次放电比容量达到了164．9mAhg^-1,在2．OCT首次放电比容量可达到125．4mAhg^-1,且循环性能良好。

Synthesis and Performance of Li4Ti5O12/C Composite Materials for Lithium-ion Battery

The spinel Li4Ti5O12/C was prepared by solid-state reaction method in the N2 atmosphere by using sucroes and soluble starch as the carbon sources. The structure, morphology and electrochemical properties of the Li4Ti5O12/C composite were characterized by X-ray diffraction（XRD）, scanning electron microscope（SEM） and electrochemical tests, respectively. The results showed that the addition of carbon sources could restrain the growth of grain, increased the specific surface area and enhance the electrical conductivity of material. Especially, the as-prepared Li4Ti5O12/C with soluble starch as carbon source, displayed the initial discharge specific capacity of 164.9mAhg^-1 at 0.1C and 125.4mAhg^-1 at 2.0C, and showed excellent cycling stability.