Preparation and Characterization of Ge4+-doping Li4Ti5O12 Anode Material for Li-ion Battery and Its Electrochemical Properties

doi:10.3724/SP.J.1077.2013.12525

Abstract

Abstract: The spinel Li₄Ti_5-xGe_xO₁₂ (x=0, 0.05, 0.1, 0.15) electrode materials were successfully synthesized by Sol-Gel method using Ti(OC₄H₉)₄, CH₃COOLi•2H₂O and GeO₂ as raw materials. The crystalline structure, morphology and electrochemical properties of the obtained materials were characterized by XRD, SEM, half cell charge-discharge tests, cyclic voltammetry (CV) and AC impedance. The results showed that doping with certain amount of Ge⁴⁺ did not change the basic structure of Li4Ti5O12, but greatly affected its mophology and particle size. Ge-doped Li₄Ti₅O₁₂ has relatively high rate capability due to the smaller particle size. In this study, Li₄Ti_4.9Ge_0.1O₁₂ represented the highest initial discharge capacity and the best cycling performance among all samples. At the charge-discharge rate of 0.2C, its first discharge capacity was 172.43 mAh/g, and at 5C rate, its discharge capacity remained at 140.62 mAh/g after 100 cycles with a capacity retention of 97.3%.

Key words: Li-ion battery, Li₄Ti₅O₁₂, Ge⁴⁺-doping, rate performance

CLC Number:

TQ174

QIU Cai-Xia, YUAN Zhong-Zhi, LIU Ling, CHENG Si-Jie, LIU Jin-Cheng. Preparation and Characterization of Ge⁴⁺-doping Li₄Ti₅O₁₂ Anode Material for Li-ion Battery and Its Electrochemical Properties[J]. Journal of Inorganic Materials, 2013, 28(7): 727-732.

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Preparation and Characterization of Ge⁴⁺-doping Li₄Ti₅O₁₂ Anode Material for Li-ion Battery and Its Electrochemical Properties

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