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A kind of preparation method of lithium iron manganese phosphate/carbon composite material

A technology of lithium iron manganese phosphate and carbon composite materials, which is applied in the direction of electrical components, electrochemical generators, battery electrodes, etc., can solve the problems that the preparation conditions are not easy to control, and achieve easy operation control, mild reaction conditions, and low cost. Effect

Active Publication Date: 2017-11-14
QINGHAI TAIFENG XIANXING LITHIUM ENERGY TECH CO LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

However, the use of ammonia in this method makes the preparation conditions difficult to control sometimes

Method used

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  • A kind of preparation method of lithium iron manganese phosphate/carbon composite material
  • A kind of preparation method of lithium iron manganese phosphate/carbon composite material
  • A kind of preparation method of lithium iron manganese phosphate/carbon composite material

Examples

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Effect test

Embodiment 1

[0039] Add the weighed 492.34g of triammonium phosphate into a 10L reactor containing 2000g of deionized water, seal the reactor, and then turn on the stirring and nitrogen valve at a speed of 35r / min to completely dissolve the salt under stirring at room temperature , Obtaining concentration is the triammonium phosphate solution of 1.2mol / L; Ferrous sulfate 222.41g, manganese sulfate 204.87g and ascorbic acid 0.85g are dissolved in the beaker that contains 1000g deionized water, obtain molar ratio as Fe / (Fe+Mn )=0.4, the total concentration is a divalent metal salt mixed solution of 2mol / L; then at room temperature, the divalent metal salt solution is added to the reaction kettle containing the triammonium phosphate solution at a feed rate of 100r / min by a peristaltic pump . After the addition of the divalent metal salt, under the protection of nitrogen and stirring, the two solutions were allowed to continue to react at room temperature for 2 hours. After the reaction, the m...

Embodiment 2

[0044] Add the weighed 844.71g of trisodium phosphate dodecahydrate into a 10L reaction kettle containing 2000g of deionized water, seal the reaction kettle, and then open the stirring and nitrogen valve at a speed of 20r / min to make the salt stir at room temperature Dissolve completely below, obtain the triammonium phosphate solution that concentration is 1.1mol / L; Anhydrous ferrous chloride 102.42g, anhydrous manganese chloride 152.61g and ascorbic acid 1.275g are dissolved in the beaker that contains 1000g deionized water, obtain Molar ratio is that Fe / (Fe+Mn)=0.4, total concentration is the divalent metal salt mixed solution of 2mol / L; After that, the divalent metal salt solution is added to the In a reactor containing triammonium phosphate solution. After the divalent metal salt is added, under the protection of nitrogen and stirring, the two solutions are allowed to continue to react at room temperature for 4 hours. After the reaction is completed, discharge the material...

Embodiment 3

[0047] Add the weighed 471.68g of tripotassium phosphate into a 10L reactor containing 1000g of deionized water, seal the reactor, and then turn on the stirring and nitrogen valve at a speed of 30r / min to completely dissolve the salt under stirring at room temperature , to obtain a concentration of triammonium phosphate solution of 2.2mol / L; 109.11g of anhydrous ferrous nitrate, 353.54g of manganese nitrate tetrahydrate and 1.38g of ascorbic acid were dissolved in a beaker containing 2000g of deionized water to obtain the molar ratio Fe / Mn =3:7, total concentration is the divalent metal salt mixed solution of 1mol / L; After that, at room temperature, the divalent metal salt solution is added to the reaction kettle containing the triammonium phosphate solution at a feed rate of 60r / min by a peristaltic pump middle. After the divalent metal salt is added, under the protection of nitrogen and stirring, the two solutions are allowed to continue to react at room temperature for 4 ho...

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Abstract

The invention relates to a preparation method for a lithium ferric manganese phosphate / carbon composite material. The preparation method comprises the following steps: preparing a sheet ferrous phosphate manganese ammonium precursor; preparing the lithium ferric manganese phosphate / carbon composite material. According to the preparation method disclosed by the invention, the high-yield sheet ferrous phosphate manganese ammonium precursor is prepared from triphosphate and a divalent metal salt; moreover, the preparation method is simple in preparation process, gentle in reaction condition, green and environmentally friendly; the precursor and the lithium salt are mixed, mixed for a second time and sintered for a second time to obtain the LiFe0.4Mn0.6PO4 / C positive material which is controllable in particle diameter, and is about 200nm in particle diameter, 154.6mAh / g in 0.2C discharge capacity, 147.1mAh / g in 1C discharge capacity. The preparation method for the lithium ferric manganese phosphate / carbon composite material can be used for realizing controllable product particle size and uniform carbon distribution, so that the performances of the final lithium ferric manganese phosphate are improved.

Description

technical field [0001] The invention belongs to the technical field of cathode materials for lithium ion batteries, and in particular relates to a preparation method of lithium iron manganese phosphate / carbon composite material. Background technique [0002] Since its inception, lithium-ion batteries have been favored by people due to their advantages such as high energy density, stable discharge voltage, and long working life. field of automobile industry. As an important part of lithium-ion batteries, the selection of cathode materials will directly affect the performance of lithium-ion batteries. [0003] At present, the anode materials for lithium-ion batteries that have been widely commercialized are mainly lithium cobaltate, lithium manganate and lithium iron phosphate. Compared with the previous two positive electrode materials, lithium iron phosphate, as a new type of positive electrode material with olivine structure, has stable working voltage, excellent platform...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): H01M4/36
CPCH01M4/139H01M4/362H01M4/5825H01M4/583H01M10/0525Y02E60/10
Inventor 黄长靓张卫东唐春霞董彬彬周恒辉陈继涛
Owner QINGHAI TAIFENG XIANXING LITHIUM ENERGY TECH CO LTD
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