Lithium iron phosphate and preparation method thereof

Abstract

The invention discloses a preparation method of lithium iron phosphate. The preparation method comprises the following steps: respectively adding an iron source, a lithium source and a phosphorus source according to a certain substance amount ratio and a certain sequence in a dispersion medium, uniformly stirring, then adding a proper amount of organic carbon source, and preparing a lithium iron phosphate precursor slurry; putting a prefabricated AAO template with appointed aperture distribution in a sealed vessel, pumping out air in the AAO template through a vacuum air pump filtration machine, then pouring the lithium iron phosphate precursor slurry into holes of the AAO template under the negative pressure action, and carrying out vacuum drying; and sintering the AAO template loading a lithium iron phosphate precursor at a certain atmosphere, and removing the AAO template with an NaOH solution to prepare a the lithium iron phosphate with a nanowire array morphology. According to the preparation method, the lithium iron phosphate has the nanowire array morphology, the tortuosity degree and distance of embedding and disembedding of lithium ions are shortened, and high-rate charge and discharge is realized.

Description

technical field [0001] The invention relates to the field of new energy, in particular to lithium iron phosphate and a preparation method thereof. Background technique [0002] The performance of lithium-ion batteries mainly depends on the positive and negative electrode materials. Lithium iron phosphate is used as the positive electrode material of lithium-ion batteries. Its safety performance and cycle life are unmatched by other materials. These are also the most important technical indicators of power batteries. . 1C charge and discharge cycle life up to 2000 times. The overcharge voltage of a single battery is 30V, it does not burn, and it does not explode when punctured. Lithium iron phosphate cathode materials make large-capacity lithium-ion batteries easier to use in series. To meet the needs of frequent charging and discharging of electric vehicles. Moreover, lithium iron phosphate has the advantages of non-toxic, non-polluting, good safety performance, wide sou...

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Problems solved by technology

[0005] The main purpose of the present invention is to provide a lithium iron phosphate and its preparation method, aiming to solve the problems of poor electrical conductivity of lithium iron phosphate and poor diffusion rate of lithium ions

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