Preparation method of superfine nanometer lithium iron phosphate electrode material and application thereof

Abstract

The invention discloses a preparation method of a superfine nanometer lithium iron phosphate electrode material, comprising the following steps of: firstly, taking an iron source compound and a phosphorus source compound as raw materials to obtain nanometer ferrous phosphate as a precursor; and secondly, using the ferrous phosphate and the lithium source compound to prepare the superfine nano lithium iron phosphate electrode material. The preparation method of ferrous phosphate, disclosed by the invention, has a simple production process; the obtained nanometer ferrous phosphate can be used for preparing the high-purity superfine nanometer lithium iron phosphate; and the ferrous valence state is not changed when the ferrous phosphate is used for preparing the lithium iron phosphate, thus, no carbon source compound or reducing agent needs to to be added to change the iron valence state, and then the carbon-coated lithium iron phosphate or non-carbon-coated lithium iron phosphate can be directly prepared. The nanometer lithium iron phosphate manufactured by the nanometer ferrous phosphate precursor has excellent performance, good discharge capacity and voltage platform performance under high capability and high multiplying power, and long cycle life.

Description

technical field [0001] The invention belongs to the technical field of battery active electrode materials. In particular, it relates to a method for preparing a nano-ferrous phosphate precursor, and a method for preparing an ultrafine nanometer lithium iron phosphate electrode material with the prepared precursor. Background technique [0002] In 1997, Goodenough et al. reported a new type of olivine structure lithium iron phosphate (LiFeP0 4 ) is used as a cathode material for lithium-ion batteries. It has high theoretical capacity (170 mAh / g), good cycle performance, abundant raw material sources, good safety performance, and environmental friendliness. Lithium iron phosphate is regarded as It is one of the most promising lithium-ion cathode materials, which can be widely used in high-power batteries for electric and hybrid vehicles, as well as energy storage batteries for renewable energy (such as wind energy, solar energy, and water energy, etc.). However, LiFeP0 4 On...

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Problems solved by technology

[0015] The purpose of the present invention is to provide a method that can overcome the shortcomings of the prior art lithium iron phosphate precursor, such as complicated preparation process, low product purity, large particles and uneven particle distribution, so that the electrode material made of the prepared precursor has excellent performance , a method for preparing a nano-ferrous phosphate precursor with high capacity, good discharge capacity at a high rate, good voltage platform, and long cycle life, and a method for preparing a nano-lithium iron phosphate electrode material with the prepared precursor

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