Preparation method of low cost battery level iron phosphate based on ferrous powder corrosion

Abstract

The invention provides a preparation method of low cost battery level iron phosphate based on ferrous powder corrosion. The method comprises the following steps of: under the alkaline condition of enough oxygen and water and the condition of mixing starch, corroding the ferrous powder to generate iron rust of which the main component is hydroxyl ferric oxide, wherein the existence of the starch is beneficial for forming a microporous loose structure; and acidizing the product by phosphoric acid and oxidizing the product by hydrogen peroxide to get the high-purity iron phosphate. The preparation method is simple and easy in technology, and needs less simple equipment; the production process is environment-friendly, production of waste is avoided; the cost is low, fewer raw materials is needed and the raw materials is cheap; in the production process of the preparation method, other ions are not introduced, the produced product is excellent in structure, low in impurity content, uniform in granularity and suitable for industrial large-scale production. Lithium iron phosphate prepared by using the iron phosphate which is prepared by the preparation method as raw material has the advantages of being high in first charge and discharge specific capacity, excellent in high rate cycling performance, low in self discharge rate, high in tap density, high in batch stability and excellent in processing performance, and so on.

Description

technical field [0001] The invention relates to a lithium iron phosphate (LiFePO 4 ) Prebody (FePO 4 ), especially a method for preparing iron phosphate precursor and iron phosphate based on iron powder corrosion to generate iron rust whose main component is iron oxyhydroxide (FeO(OH)). Background technique [0002] As a new generation of green high-energy batteries, lithium-ion batteries are widely used due to their advantages of high voltage, high energy density, good cycle performance, small self-discharge, no memory effect, and wide operating temperature range. Cathode materials are an important part of lithium-ion batteries, and lithium iron phosphate, as a new generation of cathode materials, has become a current research hotspot. Olivine lithium iron phosphate (LiFePO 4 ) can reversibly deintercalate all lithium ions to form a structurally stable iron phosphate (FePO 4 ), and release a reversible capacity of up to 170mAh / g, its advantages as a cathode material for...

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Problems solved by technology

This process has disadvantages such as high production cost, complicated process, and difficult cost control.

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