Li4Ti5O12 Modification by Bifunctional Bionic Membrane as Anode Materials for Lithium-ion Batteries†

doi:10.7503/cjcu20180328

Abstract

Abstract:

Anode material with excellent electrochemical properties was obtained by coating the polydopamine(PDA)/Super P(SP) layer with the dual effect of both ionic conduction and electronic conduction on the surface of Li₄Ti₅O₁₂ particles. The morphology, structure and electrochemical properties of the composites were characterized by X-ray diffraction(XRD), field emission scanning electron microscopy(SEM), transmission electron microscopy(TEM), charge-discharge cycle curves, and cyclic voltammetry(CV). The results showed that when the thickness of the coating layer was controlled at about 10 nm and the content of Super P was 3%(mass fraction), the sample displayed an outstanding electrochemical performance: the initial discharge capacity is 175 mA·h/g at 0.2C and the reversible discharge capacity is still above 160 mA·h/g after 150 cycles.

Key words: Li₄Ti₅O₁₂, Polydopamine, Self-polymerization, Anode, Lithium-ion battery

CLC Number:

O646

TrendMD:

YANG Shuting, LI Qianhui, FAN Yuchang, WANG Qiuxian, DU Ting, YUE Hongyun. Li₄Ti₅O₁₂ Modification by Bifunctional Bionic Membrane as Anode Materials for Lithium-ion Batteries^†[J]. Chem. J. Chinese Universities, 2018, 39(11): 2513.

Figures/Tables 9

Fig.1 XRD patterns of LTO(a) and LTOSP(b)

Fig.2 SEM images of LTO(A—C) and LTOSP(D—F)

Fig.3 TEM images of LTO(A—C) and LTOSP(D—F)

Fig.4 XPS full spectra of LTO(a) and LTOSP(b)(A) and XPS spectrum of N1s of LTOSP(B)

Fig.5 TG profiles of LTO(a), LTOSP(b), SP(c)(A) and the partially enlarged TG profiles of LTOSP(B)

Fig.6 Cycling performance at 0.2C(A) and rate performance(B) of LTO and LTOSP

Fig.7 Charge/discharge voltage profile of LTO(A) and LTOSP(B) at 0.2C

Fig.8 CV curves of LTO(A) and LTOSP(B) for the first three cycles

Fig.9 AC impedance spectra for LTO and LTOSP after 5 cycles

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Li₄Ti₅O₁₂ Modification by Bifunctional Bionic Membrane as Anode Materials for Lithium-ion Batteries^†

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