高倍率尖晶石型Li4Ti5Ol2/TiN 锂离子电池负极材料的合成及其电化学性能

doi:10.3866/PKU.WHXB20101212

Abstract

Abstract:

Spinel Li₄Ti₅O_l2/TiN was successfully prepared by sol-gel processing using acetylacetone (ACAC) as a chelating ligand and polyethylene glycol (PEG) as a dispersant. The effect of the TiN film on the electrochemical properties of spinel Li₄Ti₅O_l2 for lithium-ion batteries was studied. The Li₄Ti₅O_l2/TiN was analyzed by X-ray photoelectron spectroscopy (XPS). X-ray diffraction (XRD) patterns and scanning electron microscope (SEM) images showed that this anode material with the TiN film was pure spinel Li₄Ti₅O_l2 and was of sub-micron size. The initial specific discharge capacity of the Li₄Ti₅O_l2/TiN is 173.0 mAh·g^-1. When tested at a rate of 0.2C, 1C, 2C, and 5C, it still retained a discharge capacity of 170.6, 147.6, 135.6, and 111.0 mAh·g^-1, respectively, after 10 cycles, indicating that Li₄Ti₅O_l2/TiN had better high-rate performance than that without the TiN film. The positive effect of the TiN film on lithium-ion batteries was also demonstrated by cyclic voltammetry (CV) and electrochemical impedance spectroscopy (EIS).

Key words: Lithium-ion battery, Spinel Li₄Ti₅O_l2, TiN film, Anode material, Sol-gel processing, Polyethylene glycol

ZHOU Xiao-Ling, HUANG Rui-An, WU Zhao-Cong, YANG Bin, DAI Yong-Nian. Synthesis and Electrochemical Properties of High-Rate Spinel Li₄Ti₅O_l2/TiN Anode Material for Lithium-Ion Batteries[J]. Acta Phys. -Chim. Sin. 2010, 26(12), 3187-3192. doi: 10.3866/PKU.WHXB20101212

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Synthesis and Electrochemical Properties of High-Rate Spinel Li₄Ti₅O_l2/TiN Anode Material for Lithium-Ion Batteries

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Synthesis and Electrochemical Properties of High-Rate Spinel Li₄Ti₅O_l2/TiN Anode Material for Lithium-Ion Batteries