A kind of production technology of nanoscale anhydrous ferrous oxalate

Abstract

The invention discloses a production technique for nanometer anhydrous ferrous oxalate. The production technique comprises two characteristic technological processes: 1) preparing nanometer ferrous oxalate dihydrate by utilizing ferrous sulfate and oxalic acid; and 2) drying the nanometer ferrous oxalate dihydrate and removing crystal water, thereby obtaining the nanometer anhydrous ferrous oxalate. The production technique is energy-saving and environment-friendly; the energy consumption is about 20% lower than that of a common crystal water removing method; the grain size of the obtained nanometer anhydrous ferrous oxalate is 10-100nm; the nanometer anhydrous ferrous oxalate has unique properties of a nanometer material, including high specific surface area, quantum size effect, small size effect, and the like, is high in purity and can be applied to the production of a lithium iron phosphate battery material.

Description

technical field [0001] The invention relates to the technical field of energy storage materials, in particular to a production process of nano-scale anhydrous ferrous oxalate, and the obtained nano-anhydrous ferrous oxalate can be used in the preparation of lithium iron phosphate cathode materials. Background technique [0002] Nanomaterials refer to materials with crystal, amorphous, quasicrystal and interface layer structures with any one-dimensional size less than 100nm. When the particle size is nanoscale, the material itself has surface and interface effects, quantum size effects, small size effects and macroscopic effects. Quantum tunneling effects, these effects make nanomaterials have many strange properties. Since Lijima prepared carbon nanotubes for the first time in 1991, one-dimensional nanomaterials have attracted widespread attention. Since 1991, the United States has listed nanotechnology as "government key technology". Various projects and research institut...

AI Technical Summary

Problems solved by technology

[0004] Although there are many methods for preparing lithium iron phosphate, such as high-temperature solid-phase method, hydrothermal method, microwave method, sol-gel method, coprecipitation method, etc., the industrial waste liquid generated by the liquid-phase method is not easy to handle, resulting in material costs. The microwave method cannot achieve large-scale production, so in the preparation method of lithium iron phosphate, the high-temperature solid-phase method is still the mainstream

However, the high-temperature solid-phase method uses raw materials with larger particle size and higher melting point to synthesize lithium iron phosphate with lower actual capacity.