V2O5-carbon fluoride mixed positive electrode material and preparation method thereof

Abstract

The invention relates to the technical field of lithium battery materials, in particular to a V2O5-carbon fluoride mixed positive electrode material and a preparation method thereof. According to theinvention, a V2O5 material is doped in a carbon fluoride positive electrode material, so that the advantages that the V2O5 material has higher discharge platform voltage, good high-current discharge capacity, very small heat generation during the discharge process and the like are fully utilized, the problem of voltage lag at the initial discharge stage of the carbon fluoride positive electrode material is solved, the large-current discharge capacity of the carbon fluoride positive electrode material is effectively improved, the rate capability of the lithium carbon fluoride battery is greatlyimproved, the temperature rise during the discharge process of the lithium carbon fluoride battery is reduced, and the application range of the lithium carbon fluoride battery is expanded. Under theaction of a dispersing agent, the two materials are mixed in a high-energy ball milling manner, so that the problem of voltage lag at the initial discharge stage of the carbon fluoride positive electrode material and the problem of high heat productivity under a high-current discharge condition are further solved. According to the present invention, the zirconium oxide balls are added during the high-energy ball milling process, so that the uniformity of the mixed materials is further improved.

Description

technical field [0001] The invention relates to the technical field of lithium battery materials, in particular to a V 2 o 5 - Carbon fluoride mixed positive electrode material and preparation method thereof. Background technique [0002] A primary lithium battery is a high-energy chemical primary battery, commonly known as a lithium battery. Metal lithium is used as the negative electrode, solid salts or salts dissolved in organic solvents are used as the electrolyte, and metal oxides or other solid and liquid oxidants are used as the positive electrode active material. At present, the more mature systems mainly include lithium-manganese dioxide battery, lithium-thionyl chloride battery, lithium-sulfur dioxide battery and so on. In recent years, lithium-carbon fluoride batteries have attracted much attention due to their higher energy density. However, because fluorinated carbon is a compound formed by the reaction of various forms of carbon and fluorine gas, the conduc...

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Problems solved by technology

Although this patent improves the voltage hysteresis of carbon fluoride, the prepared battery at room temperature and 1.0C rate only increases the initial discharge voltage of fluorinated carbon material from 1.7V to 2.0V, and -10°C and 0.1C The initial discharge voltage of carbon materials is increased from 1.81V to 2.06V, and the improvement effect is not obvious

[0005] Patent application CN109888268A discloses an oxide / carbon fluoride composite positive electrode material for lithium primary batteries and its preparation method, specifically: impregnating the precursor solution of vanadium pentoxide into the carbon fluoride material by impregnation method, and carrying out Aging at a certain temperature, and after heat treatment at a certain temperature, an oxide-coated carbon fluoride material is prepared. At the same time, it is disclosed that the vanadium pentoxide material has a high discharge voltage during discharge, but the vanadium pentoxide in this application The coating layer is prepared by selecting the precursors as ammonium metavanadate, sodium vanadate, etc., the molar concentration of the solution is 0.5-5mol / L, and the reducing agent impregnated at the same time is ethylene glycol, acetic acid, oxalic acid, etc., the reaction The molar ratio of the precursor to the reducing agent is 1:5-10, which shows that the formation principle of vanadium pentoxide adopts the chemical reduction method, which makes the reaction control difficult, and there are many kinds of reagents used.

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