Preparation and effects of W-doping on electrochemical properties of spinel Li₄Ti₅O₁₂ as anode material for lithium ion battery

Abstract

W-doped Li₄Ti₅O₁₂ in the form of Li₄Ti_4.95W_0.05O₁₂ was firstly synthesized via solid state reaction. X-ray diffraction (XRD) and scanning electron microscope (SEM) were employed to characterize the structure and morphology of Li₄Ti_4.95W_0.05O₁₂. W-doping does not change the phase composition and particle morphology, while remarkably improves its cycling stability at high charge/discharge rate. Li₄Ti_4.95W_0.05O₁₂ exhibits an excellent rate capability with a reversible capacity of 131.2 mA·h/g at 10C and even 118.6 mA·h/g at 20C. The substitution of W for Ti site can enhance the electronic conductivity of Li₄Ti₅O₁₂ via the generation of mixing Ti⁴⁺/Ti³⁺, which indicates that Li₄Ti_4.95W_0.05O₁₂ is promising as a high rate anode for the lithium-ion batteries.

Keywords

lithium-ion battery / lithium titanate / anode material / doping

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