锂离子电池负极材料钼掺杂钛酸锂的制备及电化学表征

doi:10.3724/SP.J.1077.2011.10734

摘要/Abstract

摘要： 采用固相合成法制备了钽掺杂材料Li₄Ti_4.95Mo_0.05O₁₂. 通过XRD和SEM来表征Li₄Ti_4.95Mo_0.05O₁₂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. Li₄Ti_4.95Mo_0.05O₁₂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Li₄Ti_4.95Mo_0.05O₁₂是一种高倍率性能优异的锂离子电池负极材料.

关键词: 锂离子电池, 钛酸锂, 负极材料, 掺杂

Abstract: Mo -doped Li₄Ti₅O ₁₂ in the form of Li₄Ti_4.95Mo_0.05O₁₂ was synthesized via solid state reaction. X-ray diffraction (XRD) and scanning electron microscope (SEM) were employed to characterize the structure and morphology of Li₄Ti_4.95Mo_0.05O₁₂. Mo-doping does not change the phase composition and particle morphology, while improves remarkably its cycling stability at high charge/discharge rate. Li₄Ti_4.95Mo_0.05O₁₂ exhibits an excellent rate capability with a reversible capacity of 117.03 mAh/g at 10 C and even 94.24 mAh/g at 30 C . The substitution of Mo for Ti site can enhance the electronic conductivity of Li₄Ti₅O₁₂ via the generation of mixing Ti⁴⁺/Ti³⁺, which indicates that Li₄Ti_4.95Mo_0.05O₁₂ is a promising as a high rate anode for the lithium-ion batteries .

Key words: lithium-ion batteries, lithium titanate, anode materials, doping

中图分类号:

TM911

张新龙, 胡国荣, 彭忠东. 锂离子电池负极材料钼掺杂钛酸锂的制备及电化学表征[J]. 无机材料学报, 2011, 26(4): 443-448.

ZHANG Xin- Long,HU Guo- Rong,PENG Zhong- Dong. Preparation and Effects of Mo-doping on the Electrochemical Properties of Spinel Li₄Ti₅O₁₂ as Anode Material for Lithium Ion Battery[J]. Journal of Inorganic Materials, 2011, 26(4): 443-448.

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