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Method for preparing manganese phosphate iron phosphate-carbon composite material and manganese phosphate iron phosphate-carbon composite material

A technology of lithium manganese iron phosphate and carbon composite materials, applied in structural parts, electrical components, battery electrodes, etc., can solve the problems of poor cycle performance, low specific capacity, high resistivity, etc., and achieve simple preparation method and short process flow , the effect of reducing the difficulty of preparation

Active Publication Date: 2019-10-11
JIANGSU LITHITECH CO LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

[0012] In order to solve the shortcomings of the traditional preparation method of lithium manganese iron phosphate, and when the lithium manganese iron phosphate prepared by the above method is used as a lithium ion positive electrode active material, there are problems such as large resistivity, low specific capacity, and poor cycle performance. The invention proposes a new preparation method, which uses soluble metal salt liquid phase to prepare lithium manganese iron phosphate-carbon composite material

Method used

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  • Method for preparing manganese phosphate iron phosphate-carbon composite material and manganese phosphate iron phosphate-carbon composite material
  • Method for preparing manganese phosphate iron phosphate-carbon composite material and manganese phosphate iron phosphate-carbon composite material
  • Method for preparing manganese phosphate iron phosphate-carbon composite material and manganese phosphate iron phosphate-carbon composite material

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Effect test

preparation example Construction

[0089] 1.1 Preparation of soluble manganese-containing phosphate solution

[0090]Soluble manganese-containing phosphate is added to deionized water according to the solute mass fraction of 10% to 60%, and phosphoric acid can optionally be added as a regulator of phosphorus content and pH value to prevent the generation of solid insolubles. Phosphoric acid (according to pure Phosphoric acid) is added in an amount no more than 15% of the manganese-containing phosphate mass, and solution A is prepared.

[0091] The soluble manganese-containing phosphate may be manganese dihydrogen phosphate.

[0092] The phosphoric acid can be pure phosphoric acid or phosphoric acid aqueous solution, such as concentrated phosphoric acid.

[0093] In this field, commonly used manganese sources can be divided into insoluble manganese sources and soluble manganese sources according to water solubility. Insoluble manganese sources mainly include manganese oxalate, manganese carbonate, manganese dio...

Embodiment 1

[0148] (1) Preparation of soluble salt solution

[0149] a. Take by weighing 27.92kg manganese dihydrogen phosphate dihydrate (wherein by mass, Mn content is 15.01%, P content is 21.90%, the same below), 1.44kg concentrated phosphoric acid (mass fraction is 85%) in 100kg deionized water , at a temperature of 45°C, stirring and dissolving to obtain a manganese dihydrogen phosphate solution;

[0150] b. Weigh 28.00kg ferric citrate pentahydrate (by mass, purity ≥ 99.5%, the same below) in 60kg deionized water, stir and dissolve at a temperature of 30°C to obtain ferric citrate solution;

[0151] c. take by weighing 11.93kg manganese acetate tetrahydrate (by mass, purity ≥ 99.5%, the same below) in 20kg deionized water, stir and dissolve to obtain manganese acetate solution;

[0152] d. Weigh 21.46kg lithium acetate dihydrate (by mass, purity ≥ 99.5%, the same below) in 40kg deionized water, stir and dissolve to obtain lithium acetate solution;

[0153] (2) According to the ele...

Embodiment 2

[0158] The main difference between Example 2 and Example 1 is that ferrous lactate is used instead of ferric citrate pentahydrate as the soluble organic iron salt to prepare lithium manganese iron phosphate-carbon composite material. details as follows:

[0159] (1) Preparation of soluble salt solution

[0160] a. Take by weighing 27.92kg manganese dihydrogen phosphate dihydrate, 0.46kg concentrated phosphoric acid (mass fraction is 85%) in 80kg deionized water, at a temperature of 65°C, stir and dissolve to obtain manganese dihydrogen phosphate solution;

[0161] B. take by weighing 22.86kg ferrous lactate trihydrate (by mass, purity ≥ 99.5%, the same below), 1.14kg ascorbic acid in 200kg deionized water, at a temperature of 65 ° C, stir and dissolve to obtain ferrous lactate solution;

[0162] c. take by weighing 10.39kg manganese acetate tetrahydrate in 35kg deionized water, stir and dissolve to obtain manganese acetate solution;

[0163] d. Take by weighing 22.27kg lithi...

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Abstract

The invention discloses a method for preparing a manganese phosphate iron phosphate-carbon composite material and the manganese phosphate iron phosphate-carbon composite material. The method comprisesthe following steps of (1) respectively preparing soluble manganese phosphate-containing solution A, soluble organic ferric salt solution B, soluble organic manganese salt solution C and soluble organic lithium salt solution D; (2) mixing the solution A, B, C and D according to a predetermined element molar ration so as to obtain precursor solution; (3) drying and pelleting the precursor solutionobtained in the step (2) to obtain manganese phosphate iron phosphate precursor powder; (4) sintering the precursor powder obtained in the step (3) under a protection atmosphere to obtain a sinteredmaterial; and (5) carrying out smashing thinning and vacuum packaging on the material obtained in the step (4) to obtain the manganese phosphate iron phosphate-carbon composite material. The method issimple and easy to do and suitable for large-scale industrial production. The obtained material can be used as an active material for the anodes of the lithium ion batteries, and is low in resistivity and excellent in electrochemical performance.

Description

Technical field [0001] The present invention relates to a method for preparing positive electrode active materials for lithium ion batteries and corresponding positive electrode active materials for lithium ion batteries. Specifically, the present invention relates to a method for preparing lithium iron manganese phosphate-carbon composite materials using a soluble metal salt liquid phase and a method for preparing a lithium iron manganese phosphate-carbon composite material in a liquid phase. Lithium iron manganese phosphate-carbon composite material prepared by the method. Background technique [0002] In the context of today's energy crisis and energy transformation, replacing traditional fossil fuels with electric energy is in line with the development direction of the energy industry in today's society. The key to the development of the new energy industry is the development and breakthrough of secondary chemical power sources and new energy storage technologies. Compa...

Claims

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Application Information

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IPC IPC(8): H01M4/36H01M4/58H01M4/62H01M10/0525
CPCH01M4/366H01M4/5825H01M4/625H01M10/0525Y02E60/10
Inventor 龚政吕佳乐
Owner JIANGSU LITHITECH CO LTD
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