MOLYBDENUM OXYFLUORIDE AS MATERIAL OF POSITIVE-ELECTRODE FOR Li-ION BATTERY

DOI: 10.6060/tcct.20165912.5425
Izv. Vyssh. Uchebn. Zaved. Khim. Khim. Tekhnol. 2016. V. 59. N 12. P. 63-70

Li-ion batteries have widely used as a power sources for portable electronics (tablets, smartphones, cameras, notebooks, etc.), medical devices, and electric tools. At the same time, the application of Li-ion batteries technology for hybrid and electric vehicles, uninterruptible power supplies, unmanned underwater vehicles, etc. depends on designing of new electrode materials with high energy storage capacity. Transition metals oxides (for example, MoO3, V2O5, etc.) are very promising cathode materials for Li-ion batteries. They have high theoreti-cal specific capacities in comparison with conventional positive electrode materials (LiCoO2, LiNiO2, LiFePO4, LiMn2O4). However, low reversibility of the electrochemical process limits their use. At the same time, it is well known that partial substitution of the O atoms on F atoms improves the cycling stability of electrode materials. Within the scopes of the present work, nonstoichiometric orthorhombic molubdenum oxyfluoride, MoO2.8F0.2, with the lattice parame-ters close to the layered MoO3 has been synthesized by solid-phase method. The structural and morphological features of MoO2.8F0.2 were investigated by the X-ray powder diffraction and scanning electron microscopy. According to the electrochemical impedance spectroscopy data the the substitution of the O atoms on F atoms in MoO3 structure leads to conductivity increas-ing from 4.4·10–9 S cm–1 (MoO3) to 1.8·10–6 S cm–1 (MoO2.8F0.2) due to charge redistribution in the crystal lattice resulting from the reduction of Mo6+ to Mo5+. The molubdenum oxyfluoride was investigated as a cathode for the Li-ion battery. In particular, galvanostatic dis-charge/charge measurements showed that MoO2.8F0.2 exhibits a higher cycling stability in comparison with molybdenum oxide due to shielding the electrostatic interaction between the Li+ and MoO6 layers. It was established that molubdenum oxyfluoride yields higher reversible capacity (160 mAh g–1) after 10-fold cycling at a current density of 30 mA/g in the range from 3.5 to 1.5 V in comparison with MoO3 (120 mAh g–1). The electrochemical reaction mecha-nism has been investigated by the cyclic voltammetry method. Thus, the obtained results repre-sent that the suggested method for modification of positive electrode material based on transi-tion metal oxide is efficient in terms of the electrochemical performance of the battery systems.

Key words: Li-ion battery; cathode; MoO3; molybdenum oxyfluoride; irreversible capacity; cycling stability

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2016, Т. 59, № 12, Стр. 63-70

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