Preparation method of low-cost and high-performance lithium iron phosphate

Abstract

The invention relates to a preparation method of low-cost high-performance lithium iron phosphate. The method comprises the steps of carrying out high-energy smashing and nanocrystallization on an iron source in advance, then weighing a lithium source, the iron source and a phosphorus source according to the molar ratio of (1.01-1.03): 1: 1, doping a titanium source or a magnesium source with themolar ratio of (0.01-0.02), then adding a carbon source with the mass fraction of (4-10)%, and performing high-energy smashing and sufficient mixing; tabletting and granulating a mixed material to obtain a flaky precursor; putting the precursor into a kiln for sintering, controlling the temperature to rise to 730 DEG C within 0.5-4H under the protection of an inert gas atmosphere, keeping the temperature at 730 DEG C for calcining for 0.5-4H, and then cooling to room temperature along with the furnace to obtain a carbon-coated lithium iron phosphate material; and finally, crushing the preparedlithium iron phosphate, crushing, screening and removing iron to obtain a lithium iron phosphate finished product with particles in approximate normal distribution. The lithium iron phosphate is prepared by directly mixing and fusing dry powder, the process is simple, the sintering time is shortened, and compared with a wet complex production process and higher equipment investment, the preparation method can reduce the cost by more than 30%.

Description

technical field [0001] The invention relates to a preparation method of low-cost and high-performance lithium iron phosphate, belonging to the technical field of lithium batteries. Background technique [0002] In the context of the shortage of primary energy and the increasingly serious environmental pollution, green and environmentally friendly lithium-ion secondary batteries have been widely used. [0003] Lithium iron phosphate is a cathode material for lithium-ion batteries. It has long life, wide operating temperature range, high safety, low cost and high performance, environmental protection and no pollution. Lithium iron phosphate batteries made of it as the cathode material have been used in It is widely used in automobiles, electric tools, solar energy, wind power generation and energy storage. [0004] Compared with other traditional lithium-ion battery cathode materials, although the source of raw materials for lithium iron phosphate is wider and the price is lo...

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Problems solved by technology

[0004] Compared with other traditional lithium-ion battery cathode materials, although the source of raw materials for lithium iron phosphate is wider and the price is lower, in terms of application, especially in electric vehicles, the cost of lithium batteries for electric vehicles is still higher compared with traditional fuel vehicles , and the cost of cathode materials accounts for 30-45% of the total cost of lithium batteries, so the cost of cathode materials directly affects the price of lithium batteries, which in turn affects the popularity of electric vehicles

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