Hydrothermal Synthesis and Electrochemical Performance of Spherical Li4Ti5O12 as Anode Material for Lithium-ion Secondary Battery

doi:10.15541/jim20160121

Abstract

Abstract:

Self-made TiO₂ with different particle sizes was adopted to react in LiOH solution via a fast hydrothermal process, from which spherical spinel lithium titanium oxide Li₄Ti₅O₁₂ was efficiently prepared. In detail, precursor was obtained from hydrothermal reaction between TiO₂ with 5 mol/L LiOH solution at 100℃ for 20 h, and Li₄Ti₅O₁₂ was synthesized by calcining the precursor at 800℃ for 2 h. The mechanism of the hydrothermal process discussed show that an even Li-Ti-O mixture is formed during Li cation diffusing into the TiO₂, resulting in the structure conversion to pure Li₄Ti₅O₁₂ fast at high temperature. While all the obtained Li₄Ti₅O₁₂ with different particle sizes show stable electrochemical cycling ability, the 0.5 µm Li₄Ti₅O₁₂ exhibits optimal electrochemical performance. Its initial discharge capacity reaches 158 mAh/g at 0.2 C and more than 99% of capacity is retained after 70 cycles, while the reversible capability readily exceeds 125 mAh/g after 50 cycles at 0.2 C at 50℃.

Key words: lithium-ion secondary battery, hydrothermal synthesis, spherical, Li4Ti5O12

CLC Number:

O646

YAN Hui, Qi Lu, ZHANG Ding, WANG Zheng-De, LIU Yun-Ying, WANG Xiao-Xia, ZHU Tie-Yong. Hydrothermal Synthesis and Electrochemical Performance of Spherical Li₄Ti₅O₁₂ as Anode Material for Lithium-ion Secondary Battery[J]. Journal of Inorganic Materials, 2016, 31(11): 1242-1248.

Figures/Tables 7

Fig. 1 TG-DSC curves of (a) precursor obtained by hydrothermal method and (b) mechanical mixture of TiO2 and LiOH·H2O obtained by solid-state method

Fig. 2 XRD pattern of the precursors obtained from the hydrothermal reaction between TiO2 and LiOH solution with different concentrations (1 mol/L and 5 mol/L)

Fig. 3 XRD patterns of the product by calcining precursor (P1 and P2) at 800℃ for 2 to 10 h

Fig. 4 XRD patterns of Li4Ti5O12 obtained by the hydrothermal method with different particle sizes

Fig. 5 SEM images of precursors (a′-c′) after hydrothermal reaction and the final spherical Li4Ti5O12 (a-c) samples with different particle sizes (a) 0.5 µm; (b) 1.0 µm; (c) 1.5 µm

Fig. 6 Cycle performance of Li4Ti5O12 with different particle sizes at various charge/discharge rates

Fig. 7 Cycle performance of as-obtained different particle sizes (0.5~1.5 μm) Li4Ti5O12 under high temperature

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Hydrothermal Synthesis and Electrochemical Performance of Spherical Li₄Ti₅O₁₂ as Anode Material for Lithium-ion Secondary Battery

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