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Positive electrode active material coating liquid and preparation method therefor and positive electrode active material coating method

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 uneven aluminum phosphate coating layer and poor cycle performance of lithium-ion batteries, so as to improve thermal stability and maintain battery capacity Performance, the effect of avoiding side effects

Active Publication Date: 2017-07-18
JIANGSU HUADONG INST OF LI ION BATTERY +1
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

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 and preparation method therefor and positive electrode active material coating method
  • Positive electrode active material coating liquid and preparation method therefor and positive electrode active material coating method
  • Positive electrode active material coating liquid and preparation method therefor and positive electrode active material coating method

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preparation example Construction

[0028] 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:

[0029] S1, adding a phosphoric acid ester compound to an alcoholic solvent to obtain a phosphoric acid ester solution; and

[0030] S2, adding an aluminum salt and a compound of a modifying element to the phosphate solution, the aluminum salt and a compound of a modifying element are dissolved in the alcohol solvent, and react with the phosphate compound to obtain a homogeneous clear solution, namely The cathode active material coating solution.

[0031] The alcohol solvent is preferably one or more composite solvents of methanol, ethanol, propanol, n-butanol and isopropanol.

[0032] 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 m...

Embodiment 1

[0066] 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, magnesium acetate, and tetrabutyl titanate in a molar ratio of 8:1 : 1 is dissolved in ethanol to prepare a metal salt solution; the phosphate ester solution is mixed with the metal salt solution, and the molar ratio of P:M in the mixed solution of the phosphate ester and metal salt (M=Al+Mg+Ti) is 1:1 , stirred and reacted at 50° C. to obtain a homogeneous and clear cathode active material coating solution.

[0067] 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 batte...

Embodiment 2

[0070] Same as Example 1, the only difference is that the molar ratio of aluminum nitrate, magnesium acetate and tetrabutyl titanate is 6:2:2, the coating solution is dried and the XRD test results of the sintered product are as follows image 3 of (Al 0.6 Mg 0.2 Ti 0.2 )PO 4 shown.

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Abstract

The invention relates to a positive electrode active material coating liquid. The positive electrode active material coating liquid comprises a solvent and a phosphate-coated precursor which can be dissolved in the solvent, wherein the solvent at least comprises an alcohols solvent; the phosphate-coated precursor is subjected to heat treatment to generate phosphate Al<m>M<n>PO<4>, wherein M is one or more of alkaline-earth metal elements or transitional group metal elements with valence state of k; m is greater than or equal to 0 and less than 1; n is greater than 0 and less than or equal to 1; and 3m+kn is equal to 3. The invention also relates to the positive electrode active material coating liquid 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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IPC IPC(8): H01M4/62H01M10/0525
CPCH01M4/62H01M10/0525C09D1/00H01M4/0471H01M4/139H01M4/1391H01M4/366H01M4/5825H01M2004/028Y02E60/10C08K2003/321C08K2003/329C09D5/00H01M4/628
Inventor 何向明吴英强王莉尚玉明李建军倪欢渠建春
Owner JIANGSU HUADONG INST OF LI ION BATTERY
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