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A kind of preparation method of cuboid lithium battery cathode material iron manganese phosphate lithium

A lithium iron manganese phosphate, cuboid-shaped technology, which is applied in the field of new energy material preparation, can solve the problems of long cycle, poor electrochemical performance of synthetic products, and high energy consumption, and achieves low cost, improved ionic conductivity, and enhanced electrical conductivity. Effect

Active Publication Date: 2017-08-01
SHANDONG WINA GREEN POWER TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

However, the disadvantages of high energy consumption, long cycle time, and relatively poor electrochemical properties of the synthesized products make current researchers and enterprises turn their attention to other more advantageous preparation methods.

Method used

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  • A kind of preparation method of cuboid lithium battery cathode material iron manganese phosphate lithium
  • A kind of preparation method of cuboid lithium battery cathode material iron manganese phosphate lithium
  • A kind of preparation method of cuboid lithium battery cathode material iron manganese phosphate lithium

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Embodiment 1

[0032] Embodiment 1: A preparation method of lithium iron manganese phosphate cathode material for a cuboid lithium battery, comprising the following steps: dissolving 2.0402 g of lithium acetate in 20 ml of water, dissolving 2.7043 g of manganese sulfate in 20 ml of water, dissolving 1.5686 g of sulfuric acid Add ferrous ammonium into the manganese sulfate solution, stir until dissolved, pass inert gas protection during the process of dissolving and stirring and mixing, put 2.3006g of ammonium dihydrogen phosphate solution in 20nl water, mix lithium salt solution, phosphorus source solution and manganese source, Mix the iron source mixed solution evenly.

[0033]Dissolve 0.5g of CTAB in 15ml of water, add 5ml of ethylene glycol, then add the CTAB solution to the mixing system, adjust the pH value to 8.5 with ammonia water, transfer the mixed solution to the reaction kettle, and react at 180°C 8h, after the reaction was completed, the precipitate was centrifuged and washed, dr...

Embodiment 2

[0036] Embodiment 2: A preparation method of lithium iron manganese phosphate cathode material for a cuboid lithium battery, comprising the following steps:

[0037] Dissolve 2.0402g of lithium acetate in 20ml of water, 2.7043g of manganese sulfate in 20ml of water, add 1.5686g of ferrous ammonium sulfate into the manganese sulfate solution, stir until dissolved, and pass inert gas during the process of dissolving and stirring For protection, mix 2.3006g of ammonium dihydrogen phosphate solution in 20nl water, lithium salt solution, phosphorus source solution, manganese source and iron source mixed solution evenly. Dissolve 0.5g of EDTA in 15ml of water, and add 5ml of ethylene glycol, then add the EDTA solution to the mixing system, adjust the pH value to 8.5 with ammonia water, transfer the mixed solution to the reaction kettle, and react at 170°C 10h, after the reaction was completed, the precipitate was centrifuged and washed, dried, and then the intermediate product was m...

Embodiment 3

[0039] Embodiment 3: A preparation method of lithium iron manganese phosphate cathode material for a cuboid lithium battery, comprising the following steps:

[0040] Dissolve 2.0402g of lithium acetate in 20ml of water, 2.7043g of manganese sulfate in 20ml of water, add 1.5686g of ferrous ammonium sulfate into the manganese sulfate solution, stir until dissolved, and pass inert gas during the process of dissolving and stirring For protection, mix 2.3006g of ammonium dihydrogen phosphate solution in 20nl water, lithium salt solution, phosphorus source solution, manganese source and iron source mixed solution evenly. Dissolve 0.5g of CTAB in 15ml of water, add 5ml of ethylene glycol, then add the CTAB solution to the mixing system, adjust the pH value to 8.5 with ammonia water, transfer the mixed solution to the reaction kettle, and react at 150°C After 12 hours of reaction, the precipitate was centrifuged and washed, dried, and then the intermediate product was mixed with 0.750...

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Abstract

The invention discloses a preparation method of a cuboid lithium battery anode lithium ferric manganese phosphate material. Precursor materials, namely, a Mn source compound, a Fe source compound, a P source compound and a Li source compound are weighed with the molar ratio of Mn to Fe to P to Li being 0.8:0.2:1:3 and are added with water to be dissolved; after an additive is dissolved, all the solutions are sequentially mixed and evenly stirred under argon protection; the PH value is regulated to 8-9 through ammonium hydroxide; the mixed system is transferred into a reaction still to be heated; obtained sediments are washed and subjected to centrifugal drying; finally, the sediments are mixed with an appropriate amount of carbon, and after grinding and calcining, the lithium ferric manganese phosphate material is obtained. The additive like a surface active agent or a complexing agent is added and jointed with generated microcrystal grain crystal nucleuses through ionic bonds or hydrogen bonds, the growth, in a certain direction, of grains is affected, the grains are made to grow in a specific direction, and therefore a product with a specific shape is formed.

Description

technical field [0001] The invention relates to a preparation method of lithium iron manganese phosphate lithium battery positive electrode material, in particular to a preparation method of lithium iron manganese lithium phosphate positive electrode material of lithium battery with a rectangular parallelepiped shape, belonging to the technical field of new energy material preparation. Background technique [0002] In recent years, transition metal lithium phosphate LiMPO 4 (M = Mn, Fe, Co, Ni) has attracted much attention due to its low toxicity, low cost, thermal stability, and promising electrochemical performance. Compared with commercialized LiFePO 4 , (working voltage 3.4V), LiMnPO 4 Should be more ideal LiCoO 2 Alternative material because its operating voltage (about 4.1V) is closer to LiCoO 2 , which also makes it have a theoretical specific energy that is 20% higher than that of lithium iron phosphate. However, lithium manganese phosphate materials have extrem...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C01B25/45H01M4/58H01M4/136
CPCY02E60/10
Inventor 王瑗钟熊俊威王盈盈张建新马春响李魁忠张风太
Owner SHANDONG WINA GREEN POWER TECH
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