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Method for producing lithium iron phosphate

A technology of lithium iron phosphate and manufacturing method, applied in chemical instruments and methods, phosphorus compounds, inorganic chemistry, etc., can solve the problems of stable and difficult bivalent iron, etc., and achieve the effect of low cost

Inactive Publication Date: 2015-04-15
JFE CHEMICAL CORP
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  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

[0017] However, the method described in Patent Document 4 also has the problem that it is difficult to stabilize divalent iron as in the method of Patent Document 2.

Method used

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  • Method for producing lithium iron phosphate
  • Method for producing lithium iron phosphate

Examples

Experimental program
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Embodiment 1）

[0083] Dissolve 10 mol of 85% by mass phosphoric acid, 2 mol of citric acid monohydrate, and 5 mol of lithium carbonate in 2000 g of distilled water, and add 10 mol of iron powder (manufactured by JFE Steel Co., Ltd., with an oxygen content of 0.68 mass) to the mixed solution. %, the average particle size is 80μm, and the apparent density is 3.18g / cm 3 ), at a liquid temperature of 25 to 30° C., and reacted for 1 day while stirring under an air atmosphere. The reaction liquid was dried at an inlet temperature of 200° C. using a spray dryer (FOC16, manufactured by Okawara Chemical Industry Co., Ltd.), and a dry powder having an average particle diameter of about 30 μm observed by SEM was obtained. The dry powder was subjected to primary calcination at 400° C.×5 h in a nitrogen flow, and 40 g of ascorbic acid was added to the total amount of the primary calcination as a carbon source, and wet pulverization and mixing were performed by a ball mill. After the obtained mixture was...

Embodiment 1

[0087] In Example 1, except that 2 mol of malic acid was used instead of citric acid monohydrate, lithium iron phosphate was prepared by the same method as in Example 1.

Embodiment 3）

[0089] In Example 1, lithium iron phosphate was prepared by the same method as in Example 1 except that 2 mol of tartaric acid was used instead of citric acid monohydrate.

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Abstract

To provide a method for producing lithium iron phosphate possessing a high discharge capacity as an inexpensive positive active material by using inexpensive iron particles as an iron source. The lithium iron phosphate is manufactured by a synthesizing step of adding iron particles containing oxygen to an aqueous solution containing a phosphoric acid, a carboxylic acid and a lithium source, and making the components contained in the aqueous solution and the iron particles react with each other under an oxygen atmosphere; a lithium iron phosphate precursor forming step of drying the reaction liquid obtained in the synthesizing step; and a primary baking step of baking the lithium iron phosphate precursor obtained in the lithium iron phosphate precursor forming step under a non-oxidizing atmosphere, to obtain the lithium iron phosphate.

Description

technical field [0001] The present invention relates to a method for producing a cathode active material for a secondary battery represented by a lithium-ion battery. [0002] In particular, it relates to a method for producing lithium iron phosphate. Background technique [0003] For small lithium-ion batteries, which are widely used mainly in portable devices, the performance is gradually improved through the improvement of the negative active material (negative active material) and the development of the electrolyte. On the other hand, since the commercialization of small lithium-ion batteries, no major technological innovations related to positive active materials have been found, and lithium cobalt oxide (LiCoO2), which contains expensive rare metals, is still mainly used. 2 ). This lithium cobaltate is not only expensive, but also has insufficient thermal stability and chemical stability, and there is a risk of releasing oxygen at a high temperature of about 180° C.,...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C01B25/45H01M4/58
CPCH01M4/5825C01B25/45Y02E60/10H01M4/58
Inventor 田原知之酒井稔
Owner JFE CHEMICAL CORP
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