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Preparation method of positive electrode active material coating solution, and coating method of positive electrode active material

A positive electrode active material and coating technology, applied in the field of positive electrode active material coating, can solve the problems of uneven aluminum phosphate coating layer and poor cycle performance of lithium-ion batteries, so as to improve thermal stability and maintain battery capacity performance, avoid side effects, reduce negative effects

Active Publication Date: 2017-10-20
JIANGSU HUADONG INST OF LI ION BATTERY +1
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  • Summary
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  • Description
  • Claims
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Problems solved by technology

However, because aluminum phosphate is insoluble in water, the aluminum phosphate coating layer formed on the surface of the positive electrode active material by the above method is not uniform enough, so that the cycle performance of the lithium ion battery using the positive electrode active material is not good.

Method used

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  • Preparation method of positive electrode active material coating solution, and coating method of positive electrode active material
  • Preparation method of positive electrode active material coating solution, and coating method of positive electrode active material
  • Preparation method of positive electrode active material coating solution, and coating method of positive electrode active material

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[0034] see figure 1 , the embodiment of the present invention further provides a method for preparing the above-mentioned positive electrode active material coating solution, the method comprising the following steps:

[0035] S1, adding a phosphoric acid ester compound to an alcoholic solvent to obtain a phosphoric acid ester solution;

[0036] S2, adding aluminum nitrate to the phosphate ester solution, the aluminum nitrate is dissolved in the alcohol solvent, and reacts with the phosphate ester compound to obtain a homogeneous clear solution;

[0037] S3, adding an acidity regulator to adjust the pH value of the homogeneous clear solution to 6~7, the acidity regulator contains ammonium; and

[0038] S4, removing the ammonium nitrate in the clarified solution after adjusting the pH value to obtain the positive electrode active material coating solution.

[0039] The alcohol solvent is preferably one or more composite solvents of methanol, ethanol, propanol, n-butanol and i...

Embodiment 1

[0080] Mix phosphorus pentoxide and ethanol in a molar ratio of 1:10, stir at room temperature to completely react phosphorus pentoxide to form a phosphate solution; mix aluminum nitrate and ethanol in a molar ratio of 1:10 to make aluminum nitrate Completely dissolve to generate aluminum nitrate solution, the molar ratio of phosphorus pentoxide and P:Al in aluminum nitrate is 1:1; mix the phosphate ester solution with the aluminum nitrate solution, stir and react at 50°C to obtain a homogeneous clear solution Add ammonium bicarbonate several times in the clear solution of this homogeneous phase, the mol ratio of ammonium bicarbonate and Al element is 3:1, constantly stirs to obtain the solution that pH value is neutral in the process of adding; In vacuum 30 ℃~60℃, the neutral solution was distilled under reduced pressure, concentrated to 1 / 5 of the original volume, then the concentrated solution was cooled to 0℃, and the precipitated ammonium nitrate solid was filtered to obta...

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Abstract

The present invention relates to a preparation method of a positive electrode active material coating solution. The preparation method comprises the following steps: adding a phosphate ester compound into an alcoholic solvent to obtain a phosphate ester solution; adding aluminum nitrate into the phosphate ester solution, dissolving the aluminum nitrate in the alcoholic solvent, and reacting the aluminum nitrate with the phosphate ester compound to obtain a homogeneous clear solution; adding an acidity regulator to adjust the pH value of the homogeneous clear solution to 6-7, wherein the acidity regulator contains ammonium groups; and removing ammonium nitrate in the clear solution after the pH value adjustment, so as to obtain the positive electrode active material coating solution. The invention further relates to a positive electrode active material coating solution and a coating method of a positive electrode active material.

Description

technical field [0001] The invention relates to a preparation method of a positive electrode active material coating liquid and a coating method of the positive electrode active material. Background technique [0002] Coating the particle surface of the positive electrode active material of the lithium ion battery with other materials is a common method for modifying the positive electrode active material in the prior art. For example, coating a layer of carbon on the surface of lithium iron phosphate particles can effectively solve the problem of low conductivity of lithium iron phosphate, so that lithium iron phosphate coated with a carbon layer has better conductivity. In addition, the prior art has shown that coating aluminum phosphate on the surface of lithium cobalt oxide or other positive electrode active material particles can improve the thermal stability of the positive electrode of lithium ion batteries (please refer to the literature "Correlation between AlPO 4 ...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H01M4/1397
CPCH01M4/1397H01M4/0471H01M4/1391H01M4/366H01M4/505H01M4/525H01M2004/028Y02E60/10H01B1/00
Inventor 何向明吴英强王莉倪欢尚玉明
Owner JIANGSU HUADONG INST OF LI ION BATTERY
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