Iron lithium fluoride battery anode material prepared by nitrogen-doped silicon carbide-assisted solid phase one-step process and preparation method

Abstract

The invention discloses an iron lithium fluoride battery anode material prepared by a nitrogen-doped silicon carbide-assisted solid phase one-step process and a preparation method. The preparation method is characterized in that nitrogen-doped silicon carbide is adopted as a ball milling auxiliary, a conductive agent and a surface modifier at the same time in a preparation process; after the ball milling of a certain period of time and thermal treatment by a high-energy ball mill, the raw material is directly supplied to a battery production enterprise for coating production, thereby greatly reducing the intermediate steps, lowering the production cost and avoiding any waste liquid; the prepared FeF3 anode material has a stable capacity over 200mAh.g<-1> and a good multiplying power feature; iron salt containing crystal water and ammonium fluoride at a molar ratio of 1.0:(3.0-3.6), 3-15% of nitrogen-doped silicon carbide by weight and 0.5-3.0% of auxiliary by weight are subjected to normal-temperature ball milling for 5-20 hours under the atmosphere protection in the high-energy ball mill; then the material is taken out and heated to 300-450 DEG C under the protection of the mixed gas of 5% of hydrogen and 95% of argon, and the temperature is kept for 2-10 hours before cooling to obtain the FeF3 anode material which can be directly applied to slurry coating.

Description

technical field [0001] The invention relates to the technical field of a method for manufacturing a high-capacity lithium iron fluoride cathode material. Background technique [0002] Lithium-ion secondary batteries have the absolute advantages of high volume, weight-to-energy ratio, high voltage, low self-discharge rate, no memory effect, long cycle life, and high power density. Currently, the global mobile power market has an annual share of more than 30 billion US dollars and Gradually grow at a rate of more than 10%. Especially in recent years, with the gradual depletion of fossil energy, new energy sources such as solar energy, wind energy, and biomass energy have gradually become alternatives to traditional energy sources. Among them, wind energy and solar energy are intermittent, and a large amount of energy is used simultaneously to meet the needs of continuous power supply. Energy storage batteries; urban air quality problems caused by automobile exhaust are becomi...

AI Technical Summary

Problems solved by technology

Secondly, the higher capacity of the material needs to be released at a higher temperature (50-70°C). The main reason is that the activation energy of the conversion reaction in the second stage is very high, and a higher temperature is required to overcome the activation energy and have Faster reaction speed, in addition, the voltage difference between the charge platform and discharge platform of the material is very high, which is also a manifestation of high reaction activation energy and poor reaction reversibility

Finally, because FeF 3 The material is slightly soluble in cold water, so it is usually prepared by the ethanol liquid phase method, which requires a large amount of ethanol during the synthesis process, which is not economical

Not suitable for industrial applications

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