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Positive electrode active material coating liquid, preparation method thereof, and coating method of positive electrode active material

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

Active Publication Date: 2019-06-14
JIANGSU HUADONG INST OF LI ION BATTERY +1
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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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  • Positive electrode active material coating liquid, preparation method thereof, and coating method of positive electrode active material
  • Positive electrode active material coating liquid, preparation method thereof, and coating method of positive electrode active material
  • Positive electrode active material coating liquid, preparation method thereof, and coating method of positive electrode active material

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preparation example Construction

[0032] 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:

[0033] S1, adding a phosphoric acid ester compound to an alcoholic solvent to obtain a phosphoric acid ester solution; and

[0034] S2, adding an aluminum salt to the phosphoric acid ester solution, the aluminum salt is dissolved in the alcoholic solvent, and reacts with the phosphoric acid ester compound to obtain a homogeneous clear solution, that is, the positive electrode active material coating solution.

[0035] The alcohol solvent is preferably one or more composite solvents of methanol, ethanol, propanol, n-butanol and isopropanol.

[0036] The general formula of the phosphate compound can be A n P(O)(OH) m , wherein A is a carbon-oxyl group corresponding to the alcohol solvent molecule, such as at least one of methoxy, ethoxy, propoxy, butoxy and is...

Embodiment 1

[0061] 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 and clear positive electrode Active material coating fluid.

[0062] The positive electrode active material coating liquid and the positive electrode active material LiNi 1 / 3 co 1 / 3 mn 1 / 3 o 2 Mix according to the mass ratio of 1:5~1:2, filter the excess liquid phase, dry at 60°C and then sinter in the air at 400°C to obtain the positive electrode composite material and assemble the lithium-ion battery. The electrolyte in the lithium-ion battery is 1.0 mol L -1 LiPF 6 (EC / EMC=3...

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Abstract

The invention relates to a method for preparing a coating solution for positive electrode active materials, comprising the following steps: S1, adding a phosphoric acid ester compound to an alcohol solvent to obtain a phosphoric acid ester solution; and S2, adding an aluminum salt to the phosphoric acid ester solution, The aluminum salt is dissolved in the alcohol solvent and reacted with the phosphate compound to obtain a homogeneous clear solution. The invention also relates to a positive electrode active material coating solution and a positive electrode active material coating method.

Description

technical field [0001] The invention relates to a positive electrode active material coating liquid, a preparation method thereof 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 Al...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): H01M4/36H01M10/0525
CPCH01M4/366H01M10/0525H01M4/131C01B25/36H01M4/505H01M4/525H01M4/628Y02E60/10H01B1/00C01G53/50C01P2004/80C01P2006/40C09D1/00H01M2004/028
Inventor 何向明吴英强王莉李建军尚玉明倪欢渠建春
Owner JIANGSU HUADONG INST OF LI ION BATTERY
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