Method for preparing lithium iron manganese phosphate precursor and method for preparing lithium iron manganese phosphate

A technology of lithium iron manganese phosphate and its precursor is applied in the field of preparing nanoscale lithium iron manganese phosphate precursor ferromanganese oxalate or ferromanganese phosphate, which can solve the advantages of ternary high energy density discount and the high cost of ternary materials. and other problems, to achieve the effect of low resistivity

Pending Publication Date: 2020-04-10
JIANGSU LITHITECH CO LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0006] The second aspect is cost. Currently, the cost of ternary materials remains high, especially the price of high-nickel ternary positive electrode active material NCM811 is more than 100% higher than that of lithium manganese iron phosphate material.
[0007] The third aspect is battery life. Theoretic

Method used

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  • Method for preparing lithium iron manganese phosphate precursor and method for preparing lithium iron manganese phosphate
  • Method for preparing lithium iron manganese phosphate precursor and method for preparing lithium iron manganese phosphate
  • Method for preparing lithium iron manganese phosphate precursor and method for preparing lithium iron manganese phosphate

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Embodiment approach

[0117] Hereinafter, the present invention will be described in detail with reference to Examples to specifically describe the present invention. However, the embodiments of the present invention may be modified into various other forms and the scope of the present invention should not be construed as being limited to the embodiments described below. The embodiments of the present invention are provided so as to more fully describe the present invention to those skilled in the art.

[0118] If the experimental methods in the following examples do not indicate specific conditions, they are usually the conventional conditions in this field or the conditions suggested by the manufacturer; the raw materials and equipment used, if no special instructions, are available from commercial channels such as the conventional market Raw materials and equipment obtained.

Embodiment A1

[0120] The lithium manganese iron phosphate precursor is prepared by the following procedure.

[0121] (1) Prepare a mixed solution of 2mol / L ferrous sulfate and manganese sulfate (where the molar ratio of iron to manganese is 5:5), and 2mol / L oxalic acid solution.

[0122] (2) Adopt the parallel flow mode, pump the mixed solution and the oxalic acid solution into the high-gravity rotating bed (vertical high-gravity rotating bed, Hangzhou Keli Chemical Equipment Co., Ltd. company, BZ650-3P) carry out co-precipitation reaction, wherein the reaction temperature in the high gravity rotary bed is 25 ℃, the feed rate of two kinds of raw materials is controlled at 100mL / min respectively, and the rotating speed of high gravity rotary bed is 2000rpm. Obtain the first slurry of ferromanganese oxalate.

[0123] (3) The first slurry of ferromanganese oxalate is centrifugally washed by a centrifuge (Jiangsu Shengli Centrifuge Manufacturing Co., Ltd. PSD / SD1000) to obtain a filter cake of...

Embodiment A2

[0128] The same process as in Example A1 was adopted, except that in step (1), the 2mol / L oxalic acid solution was replaced by a 2mol / L phosphoric acid solution. Finally, ferromanganese phosphate solid is obtained, which is the precursor of lithium iron manganese phosphate.

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Abstract

The invention relates to a method for preparing a lithium iron manganese phosphate precursor and a method for preparing lithium iron manganese phosphate. The method for preparing the lithium iron manganese phosphate precursor comprises the following steps: (1) preparing a liquid material A and a liquid material B, wherein the liquid material A is a mixed solution of a manganese salt and an iron salt, and the liquid material B is an oxalic acid or phosphoric acid solution; (2) carrying out a coprecipitation reaction on the liquid material A and the liquid material B in a supergravity rotating bed to obtain a first slurry; (3) washing and filtering the first slurry to obtain a filter cake; (4) mixing the filter cake with water, adding a carbon source, and uniformly stirring to obtain a second slurry; (5) homogenizing the second slurry; and (6) drying the homogenized second slurry to obtain the lithium iron manganese phosphate precursor. The particle size of the lithium iron manganese phosphate precursor prepared by the method is smaller and more uniform than that of a precursor prepared by a traditional method using a reaction kettle, the preparation speed is increased, and carbon coating is uniform.

Description

technical field [0001] The invention belongs to the technical field of chemical crystallization, and in particular relates to a method for preparing nano-scale lithium manganese iron phosphate precursor ferromanganese oxalate or ferromanganese phosphate through a supergravity technology. [0002] technical background [0003] With the popularization of various electronic products and electric vehicles, people's requirements for battery capacity and electric vehicle cruising range are constantly increasing. Driven by this trend, high-nickel ternary cathode active materials will become an inevitable development direction. In the ternary positive electrode active material, the higher the nickel content, the higher the discharge specific capacity after the battery is assembled. But everything has two sides, and high-nickel ternary positive electrode active materials are not invulnerable. Many experts pointed out that the higher the nickel ratio, the worse the thermal stability ...

Claims

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Application Information

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IPC IPC(8): C01B25/45H01M4/136H01M4/58H01M10/052B82Y30/00B82Y40/00C07C51/41C07C55/07
CPCC01B25/45H01M4/5825H01M4/136H01M10/052B82Y30/00B82Y40/00C07C51/412H01M2220/10H01M2220/20C01P2004/64C01P2004/62C01P2004/61C01P2006/40C07C55/07Y02E60/10C01P2004/60H01M2004/028H01M2004/021H01M2220/30
Inventor 马寅龚政郭永楠李佳玮吕佳乐
Owner JIANGSU LITHITECH CO LTD
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