锂离子电池负极材料钼掺杂钛酸锂的制备及电化学表征(英文)

Preparation and Effects of Mo-doping on the Electrochemical Properties of Spinel Li_4Ti_5O_(12) as Anode Material for Lithium Ion Battery

采用固相合成法制备了钽掺杂材料Li4Ti4.95Mo0.05O12.通过XRD和SEM来表征Li4Ti4.95Mo0.05O12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94.24 mAh/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 morphol-ogy 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.