采用固相合成法制备了钽掺杂材料 Li4.95Mo0.05O12.通过XRD和SEM来表征Li4Ti4.95Mon0.05O12的结构和形貌.结果表明:钼掺杂并没有改变本体材料的结构和形貌,而且显著提高了材料的循环性能和倍率性能.Li4Ti4.95Mo0.05O12在10C和30C倍率的放电容量分别为117.03和94.24mAh/g.Mo掺杂取代了Li4Ti5O12中的Ti位置,产生了Ti4+/Ti3+混合价态,从而提高了钛酸锂的电导率.所以Li4Ti4.95Mo0.05O12是一种高倍率性能优异的锂离子电池负极材料.
Mo-doped Li4Ti5O12 in the form of Li4Ti4.95Mo0.05O12 was synthesized via solid state reaction. X-ray diffraction (XRD) and scanning electron microscope (SEM) were employed to characterize the structure and morphology of Li4Ti4.95Mo0.05O12. Mo-doping does not change the phase composition and particle morphology, while improves remarkably its cycling stability at high charge/discharge rate. Li4Ti4.95Mo0.05O12 exhibits an excellent rate capability with a reversible capacity of 117.03 mAh/g at 10C and even 94.24 mAh/g at 30C. The substitution of Mo for Ti site can enhance the electronic conductivity of Li4Ti5O12 via the generation of mixing Ti4+/Ti3+, which indicates that Li4Ti4.95Mo0.05O12 is a promising as a high rate anode for the lithium-ion batteries.
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