Preparation method of lithium iron phosphate battery positive electrode material

Abstract

The preparation method of the lithium iron phosphate battery positive electrode material comprises the following steps: dissolving ferric chloride in ethylene glycol, adding sodium acetate and polyethylene glycol, and performing heating; performing cooling to obtain ferroferric oxide; oxidizing the obtained ferroferric oxide into nano ferric oxide particles; mixing lithium acetate, nano ferric oxide and ammonium dihydrogen phosphate, performing mixing with a carbon source, and carrying out ball milling; sintering the powder, and performing cooling to obtain a carbon-coated lithium iron phosphate positive electrode material; washing the lithium iron phosphate powder, and adding an ethanol wetting agent to prepare turbid liquid; mixing soluble lithium salt, ferric salt and phosphate in an ethanol solution, adding the mixture into the turbid liquid, and performing mixing and drying; and roasting in an inert gas atmosphere to obtain the qualified lithium iron phosphate positive electrode material. According to the method, the defects in the prior art are overcome, the carbon-coated lithium iron phosphate positive electrode material is prepared by taking the ferric oxide particles as the raw material and the template, and the product can obtain the morphology of the template, is nano spherical particles with better uniformity and is smaller.

Description

technical field [0001] The invention relates to the technical field of lithium ion batteries, in particular to a method for preparing a lithium iron phosphate battery cathode material. Background technique [0002] Lithium-ion batteries are widely used in portable devices, mobile power supplies, large electric vehicles, communication power supplies, and other fields due to their high operating voltage, high energy density, wide temperature range, long life, no memory effect, and environmental protection. application prospects. As the positive electrode material of lithium-ion batteries, lithium iron phosphate has the advantages of long cycle life, good safety performance, stable structure during charging and discharging, and no pollution to the environment compared with other materials. It has extensive research and application in the field of lithium-ion batteries . [0003] However, the current lithium iron phosphate cathode material has poor conductivity and is not suit...

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Problems solved by technology

[0003] However, the current lithium iron phosphate cathode material has poor conductivity and is not suitable for high-rate charging and discharging. At present, the market has higher and higher requirements for fast charging of electric lithium batteries.

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