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Preparation method of lithium iron phosphate cathode material

A technology of lithium iron phosphate and positive electrode materials, applied in battery electrodes, electrical components, electrochemical generators, etc., can solve problems such as uneven mixing of raw materials and high energy consumption, and achieve the effect of solving uneven mixing of raw materials

Active Publication Date: 2017-11-14
HEFEI GUOXUAN HIGH TECH POWER ENERGY
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0003] At present, in the preparation process of conventional lithium iron phosphate cathode materials, large energy consumption will be generated due to stirring and ball milling; at the same time, there may be uneven mixing of raw materials in the preparation process of lithium iron phosphate

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0016] 1. Weigh quantitative chitosan and dissolve it in deionized water to prepare a chitosan solution with a concentration of 0.01g / ml, stir magnetically at 40°C for 2 hours to completely dissolve it, and let it stand for defoaming for later use.

[0017] 2. Weigh lithium hydroxide, iron phosphate and magnesium hydroxide according to the molar ratio of Li, Fe, P and Mg of 1:1:1:0.05, put them in a beaker, add an appropriate amount of deionized water, and ultrasonically stir. Make it well mixed.

[0018] 3. Take 0.4ml of chitosan solution and add it to 20ml of the prepared solution above, place it in a petri dish, seal it with plastic wrap, prick a few holes with a needle for gas diffusion, then weigh 5g of ammonium carbonate and put it in a beaker for later use. Put the petri dish and the small beaker filled with ammonium carbonate into a sealed container and place it in a constant temperature incubator, and adjust the temperature to 60°C for constant temperature cultivation...

Embodiment 2

[0020] 1. Weigh quantitative starch and dissolve it in deionized water to prepare a starch solution with a concentration of 0.01g / ml. Dissolve it completely by magnetic force at 40°C for 2 hours, and let it stand for defoaming for later use.

[0021] 2. Weigh lithium hydroxide, iron phosphate and magnesium hydroxide according to the molar ratio of Li, Fe, P and Mg of 1:1:1:0.05, put them in a beaker, add an appropriate amount of deionized water, and ultrasonically stir. Make it well mixed.

[0022] 3. Take 0.4ml of starch solution and add it to 20ml of the prepared solution above, put it in a petri dish, seal it with plastic wrap, prick a few holes with a needle for gas diffusion, then weigh 10g of ammonium carbonate and put it in a beaker for later use. Put the petri dish and the small beaker filled with ammonium carbonate into a sealed container and place it in a constant temperature incubator, and adjust the temperature to 60°C for constant temperature cultivation. Accordi...

Embodiment 3

[0024] 1. Weigh quantitative pepsin and dissolve it in deionized water to prepare a pepsin solution with a concentration of 0.01g / ml, stir magnetically at 40°C for 2 hours to dissolve it completely, and let it stand for defoaming for later use.

[0025] 2. Weigh lithium hydroxide, iron phosphate and magnesium hydroxide according to the molar ratio of Li, Fe, P and Mg of 1:1:1:0.05, put them in a beaker, add an appropriate amount of deionized water, and ultrasonically stir. Make it well mixed.

[0026] 3. Take 0.4ml of pepsin solution and add it to 20ml of the prepared solution above, put it in a petri dish, seal it with plastic wrap, prick a few holes with a needle for gas diffusion, then weigh 5g of ammonium carbonate and put it in a beaker for later use. Put the petri dish and the small beaker filled with ammonium carbonate into a sealed container and place it in a constant temperature incubator, and adjust the temperature to 60°C for constant temperature cultivation. Accor...

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Abstract

The invention discloses a preparation method of a lithium iron phosphate anode material. The method comprises the steps of ultrasonically dispersing iron phosphate and lithium sources into deionized water, adding chitosan, cane sugar, pepsin, erepsin or trypsin, fully stirring and uniformly mixing, and placing into a sealed container. Relatively high CO2 concentration is kept in the sealed container. Under the regulation of biological organic large molecules, Li2CO3 crystals uniformly grow by taking the surfaces of iron phosphate particles as basal bodies, and a little of Mg<2+> can be added into a solution to control the growth of the Li2CO3 crystals. After reacting for several days, turbid liquid is filtered and washed for several times and placed into a drying box for drying to prepare a lithium iron phosphate precursor, and sintering is performed under gas shield to obtain the lithium iron phosphate anode material. According to the preparation method, the problem that the energy consumption is relatively large due to stirring and ball-milling in a conventional lithium iron phosphate material preparation process is solved; meanwhile, lithium carbonate prepared through biomimetic synthesis uniformly attaches to the peripheries of the iron phosphate particles, and the problem of nonuniform raw material mixing possibly existing in the preparation process of lithium iron phosphate is solved.

Description

technical field [0001] The invention relates to a preparation method of lithium iron phosphate cathode material, in particular to a method for biomimetic synthesis of lithium iron phosphate material. Background technique [0002] LiFePO 4 It has the characteristics of wide source of raw materials, low price, good thermal stability, excellent cycle performance, outstanding safety performance and zero environmental pollution, and the theoretical capacity can reach 170mAh·g -1 , the operating voltage is about 3.45V, making it an ideal electrode material for the field of electric vehicles. [0003] At present, in the preparation process of conventional lithium iron phosphate cathode materials, large energy consumption will be generated due to stirring and ball milling; at the same time, there may be uneven mixing of raw materials in the preparation process of lithium iron phosphate. Contents of the invention [0004] The technical problem to be solved by the present inventio...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): H01M4/58H01M10/0525
CPCH01M4/5825H01M10/0525Y02E60/10
Inventor 汪伟伟杨茂萍
Owner HEFEI GUOXUAN HIGH TECH POWER ENERGY
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