Preparation and Application of High Performance Lithium Titanate/reduced Graphene Oxide Nanocomposites for Lithium Batteries†

doi:10.7503/cjcu20180250

Abstract

Abstract:

Mesoporous lithium titanate/reduced graphene oxide anode material was synthesized by a simple hydrothermal method. The morphology and structure of the obtained materials were characterized. The electrochemical properties of the obtained materials were tested. The results show that the lithium titanate/reduced graphene oxide anode material posseses high specific surface area and the lithium titanate nanosheets are not easy to agglomerate; the initial discharge specific capacity is increased to 182.2 mA·h/g at 0.1C rate; and the cycling performance is greatly improved, with a cupacity of 160.6 mA·h/g after 500 cycles at 5C rate.

Key words: Lithium ion battery, Mesoporous material, Li₄Ti₅O₁₂, Reduced graphene oxide

CLC Number:

O646

TrendMD:

SUN Bing,JIANG Shang,WANG Runwei,NI Ling,QIU Shilun,ZHANG Zongtao. Preparation and Application of High Performance Lithium Titanate/reduced Graphene Oxide Nanocomposites for Lithium Batteries^†[J]. Chem. J. Chinese Universities, 2018, 39(12): 2767.

Figures/Tables 9

Fig.1 XRD patterns of samples LTO(a) and LTO/RGO(b)

Fig.2 SEM images of RGO(A), LTO/RGO(B), LTO(C) and TEM image(D), HRTEM image(E) of LTO/RGO composites

Fig.3 N2 adsorption-desorption isotherms(A) and Barret-Joyner-Halenda(BJH) pore size distributions(B) of LTO(a) and LTO/RGO(b)

Fig.4 TG curve of LTO/RGO tested in air

Fig.5 SEM images of LTO/RGO(A) and the corresponding elemental mapping(B—D) (B) O; (C) Ti; (D) C.

Fig.6 Survey XPS(A) and high resolution XPS spectra of Ti2p(B), C1s(C) and O1s(D) of LTO/RGO

Fig.7 Charge-discharge curves of the LTO/RGO composite at different current densities

Fig.8 Cycle performance of the LTO and LTO/RGO electrode at a rate of 5C

Fig.9 Charge-discharge curves(A), cyclic voltammograms(B), electrochemical impedance spectra(C) and rate performance at different rates(D) of the LTO(a) and LTO/RGO(b) composites Inset of (C) is fitting circuit by EIS.

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