| 摘要 |
Field of use: the electrochemical industry, in particular, anode materials for lithium-ion battery (LIB). Essence of invention: Anode material based on lithium-titanium spinel that contains doping components: chromium and vanadium, in equivalent quantities of the chemical formula Li 4 Ti 5-y (CrV) y O 12-x , where x is deviation from stoichiometry within the limits 0.02<x<0.5, and y is the stoichiometric coefficient within the limits 0<y<0.1. The method of production of the anode material includes preparation of mixture of the initial components that contain lithium and titanium and source of doping agents chromium and vanadium, by means of homogenization and grinding which is carried out until particles not greater than 0.5 µm in size are obtained, with subsequent stepwise heat treatment of the prepared mixture in a controlled atmosphere of inert argon and reducing acetylene steam from 999:1 to 750:250, respectively, according to the following procedure: at first stage the mixture of components is heated to temperature not higher than 350 °C; at second stage the heating is continued in the 350-750 °C temperature interval in rate not greater than 10 °C/min, which is provided for solid-state interaction for components; at the third stage, the temperature is increased to 840-850 °C and the product obtained is held at this temperature not less than 1 hour; at fourth the temperature is decreased to 520-580 °C at rate not greater than 5 °C/min and the anode material obtained is held at this temperature not less than 2 hours; at the final stage the finished anode material is blown through with pure argon during cooling to 40-60 °C and packaged. Technical result: The anode material for lithium ion battery possesses high electrochemical capacity (165±5 mA·h/g) and electronic conductivity (2·10 -1 Ohm -1 ·cm -1 ) and can be produced from accessible components on traditional equipment of domestic facilities. |
