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Positive pole active material cladding liquid, preparation method thereof, and cladding method for positive pole 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: 2017-06-27
JIANGSU HUADONG INST OF LI ION BATTERY +1
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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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 pole active material cladding liquid, preparation method thereof, and cladding method for positive pole active material
  • Positive pole active material cladding liquid, preparation method thereof, and cladding method for positive pole active material
  • Positive pole active material cladding liquid, preparation method thereof, and cladding method for positive pole 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 cathode active material coating solution, and the method includes the following steps:

[0033] S1, adding a phosphate compound to the alcohol solvent to obtain a phosphate solution; and

[0034] S2: Add aluminum salt to the phosphoric acid ester solution, the aluminum salt is dissolved in the alcohol 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 , Where A is the carbonoxy group corresponding to the alcohol solvent molecule, such as at least one of methoxy, ethoxy, propoxy, butoxy and isopropoxy, n=1~3, m=0~2, m+n=3. The phosphate compounds c...

Embodiment 1

[0061] Mix phosphorus pentoxide and ethanol in a molar ratio of 1:10, stir at room temperature to completely react the phosphorus pentoxide to form a phosphate solution; mix aluminum nitrate and ethanol in a molar ratio of 1:10 to make aluminum nitrate Dissolve completely to produce aluminum nitrate solution. The molar ratio of P:Al in the phosphorus pentoxide to aluminum nitrate is 1:1; mix the phosphate ester solution with the aluminum nitrate solution, and stir the reaction at 50°C to obtain a homogeneous and clear positive electrode Active material coating liquid.

[0062] The positive electrode active material coating solution 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 sinter in 400°C air to obtain the positive electrode composite material and assemble the lithium ion battery. The electrolyte in this lithium ion battery is 1.0 mol L -1 LiPF 6 (EC / EMC=3:7, ...

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Abstract

The invention relates to a preparation method of a positive pole active material cladding liquid. The preparation method includes the steps of: 1) adding a phosphate compound to an alcohol solvent to prepare a phosphate solution; 2) adding an aluminum salt to the phosphate solution, wherein the aluminum salt is soluble in the alcohol solvent and can be reacted with the phosphate compound to obtain a homo-phase clear solution. The invention also relates to the positive pole active material cladding liquid and a cladding method for a positive pole active material.

Description

Technical field [0001] The invention relates to a positive electrode active material coating solution, a preparation method thereof, and a positive electrode active material coating method. Background technique [0002] Using other materials to form the coating on the particle surface of the positive electrode active material of the lithium ion battery 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 the 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 document "Correlation b...

Claims

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Application Information

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Patent Type & Authority Applications(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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