LiMn2O4/CNTs and LiNi0.5Mn1.5O4/CNTs Nanocomposites as High-Performance Cathode Materials for Lithium-Ion Batteries

doi:10.1007/s40195-014-0181-9

Abstract

Abstract:

The demand of higher energy density and higher power capacity of lithium (Li)-ion secondary batteries has led to the search for electrode materials whose capacities and performance are better than those available today. Carbon nanotubes (CNTs), with their unique properties such as 1D tubular structure, high electrical and thermal conductivities, and extremely large surface area, have been used as materials to prepare cathodes for Li-ion batteries. The structure and morphology of CNTs were analyzed by X-ray diffraction (XRD), scanning electron microscopy (SEM), and transmission electron microscopy (TEM). The functional groups on the purified CNT surface such as -COOH,-OH were characterized by Fourier Transform infrared spectroscopy. The electrode materials were fabricated from LiMn₂O₄ (LMO), doped spinel LiNi_0.5Mn_1.5O₄, and purified CNTs via solid-state reaction. The structure and morphology of the electrode were characterized using XRD, SEM, and TEM. Finally, the efficiency of the electrode materials using CNTs was evaluated by cyclic voltammetry and electrochemical impedance spectroscopy.

Key words: Nanocomposites, Carbon nanotubes (CNTs), Spinel materials, Lithium-ion batteries (LIBs)

Thang Van Le, Ha Tran Nguyen, Anh Tuan Luu, Man Van Tran, Phung Loan My Le. LiMn₂O₄/CNTs and LiNi_0.5Mn_1.5O₄/CNTs Nanocomposites as High-Performance Cathode Materials for Lithium-Ion Batteries[J]. Acta Metallurgica Sinica (English Letters), 2015, 28(1): 122-128.

Figures/Tables 12

Fig. 1 SEM images of CNTs before a, after b acid treatment

Fig. 2 TEM images of CNTs before a, after b acid treatment

Fig. 3 SEM images of LMO particles a, LNMO particles b

Fig. 4 XRD patterns of the doped spinel structure of LMO and LNMO materials

Fig. 5 Schematic illustration of the synthesis of LMO/CNT and LNMO/CNT nanocomposites

Fig. 6 SEM images of LMO/CNT (2 wt%) a, LNMO/CNT (2 wt%) b nanocomposites

Fig. 7 TEM images of LMO/CNT (2 wt%) a and LNMO/CNT (2 wt%) b nanocomposites

Fig. 8 XRD diagrams of pure CNTs, LMO/CNT (2 wt%), and LNMO/CNT (2 wt%) nanocomposites

Fig. 9 CV curves of LMO/CNT (2 wt%) nanocomposites and LMO/VC (Vulcan Carbon ~2 wt%)

Fig. 10 CV curves of LNMO/CNT nanocomposites with 2 wt% CNTs and LNMO/VC with 2 wt% Vulcan Carbon

Fig. 11 Nyquist plot of LMO/10 wt% CNT and LMO/10 wt% Vulcan-Carbon nanocomposite electrode at room temperature

Fig. 12 Nyquist plot of LNMO/10 wt% CNTs and LNMO/10 wt% Vulcan-Carbon nanocomposite electrode at room temperature

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LiMn₂O₄/CNTs and LiNi_0.5Mn_1.5O₄/CNTs Nanocomposites as High-Performance Cathode Materials for Lithium-Ion Batteries

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