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A kind of ternary cathode material coated with organic double layer and its preparation and application

A positive electrode material, double-layer coating technology, applied in the field of lithium-ion battery electrode material preparation, can solve problems such as damage, not conducive to improving the rate performance of particle materials, poor ion/electronic conductivity of inorganic coatings, etc.

Active Publication Date: 2021-09-10
CENT SOUTH UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

At present, inorganic materials have certain shortcomings as coating materials: first, it is difficult to uniformly coat these inorganic substances on the surface of material particles by conventional methods
Second, it is usually necessary to recalcine the cladding material to crystallize the coating, which not only requires additional energy consumption, but also may reduce the crystallinity of the matrix material, and the contact interface between the inorganic cladding layer and the positive electrode matrix will change with the Cycling damage occurs; third, inorganic coatings usually have poor ion / electronic conductivity, which is not conducive to improving the rate performance of granular materials

Method used

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  • A kind of ternary cathode material coated with organic double layer and its preparation and application
  • A kind of ternary cathode material coated with organic double layer and its preparation and application
  • A kind of ternary cathode material coated with organic double layer and its preparation and application

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0051] Accurately weigh 0.05g of polyacrylic acid, 10g of lithium nickel cobalt aluminate (LiNi 0.8 co 0.15 Al 0.05 o 2 ) was dissolved in 10mL isopropanol, stirred for 2 hours to obtain mixed solution A, 2mL water, 0.05g KH550 and 0.05g polyacrylic acid were sealed and stirred in a water bath at 60°C for 2 hours to obtain solution B, and then added solution B to solution A Stirring was continued for 3 hours. The obtained liquid was placed in an oven at 100° C. for 12 hours to evaporate the isopropanol and water to dryness, and a rigid-flexible blend polymer-coated ternary material with a coating amount of 1.5 wt % was obtained.

[0052] Weigh 0.32g rigid-flexible blend polymer-coated ternary material sample, add 0.04g conductive carbon black and 0.04g PVDF, mix and grind manually in an agate mortar for 20min, add appropriate amount of NMP, and prepare a slurry with a certain viscosity. Coat the prepared slurry on an aluminum foil with a thickness of 18 μm, dry it under va...

Embodiment 2

[0054] Accurately weigh 0.05g of alginic acid, 10g of lithium nickel cobalt aluminate (LiNi 0.8 co 0.15 Al 0.05 o 2 ) was dissolved in 10mL isopropanol, stirred for 2 hours to obtain mixed solution A, 2mL water, 0.05g KHT-103 and 0.05g alginic acid were sealed and stirred in a water bath at 60°C for 2 hours to obtain solution B, and then added to Solution A was stirred continuously for 3 hours. The resulting liquid was placed in an oven at 100° C. for 12 hours to evaporate the isopropanol and water to dryness to obtain a rigid-flexible blend polymer-coated ternary material with a coating amount of 1.5 wt%.

[0055] Weigh 0.3200g rigid-flexible blend polymer-coated ternary material sample, add 0.04g conductive carbon black and 0.04g PVDF, mix and grind manually in an agate mortar for 20min, add appropriate amount of NMP, and prepare a slurry with a certain viscosity. Coat the prepared slurry on an aluminum foil with a thickness of 18 μm, dry it under vacuum at 120 ° C, and ...

Embodiment 3

[0057] Accurately weigh 0.05g of alginic acid, 10g of lithium nickel cobalt aluminate (LiNi 0.8 co 0.15 Al 0.05 o 2 ) was dissolved in 10mL isopropanol, stirred for 2 hours to obtain mixed solution A, 2mL water, 0.05g KH570 and 0.05g alginic acid were sealed and stirred in a water bath at 60°C for 2 hours to obtain solution B, and then added solution B to solution A Stirring was continued for 3 hours. The resulting liquid was placed in an oven at 100° C. for 12 hours to evaporate the isopropanol and water to dryness to obtain a rigid-flexible blend polymer-coated ternary material with a coating amount of 1.5 wt%.

[0058] Weigh 0.32g rigid-flexible blend polymer-coated ternary material sample, add 0.04g conductive carbon black and 0.04g PVDF, mix and grind manually in an agate mortar for 20min, add appropriate amount of NMP, and prepare a slurry with a certain viscosity. Coat the prepared slurry on an aluminum foil with a thickness of 18 μm, dry it under vacuum at 120 ° C,...

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Abstract

The invention belongs to the technical field of battery materials, and specifically discloses a ternary positive electrode material coated with organic matter with good mechanical and chemical stability. The hydrophobic outer layer of the flexible middle layer; the material of the flexible middle layer is a flexible polymer; the outer layer is a cross-linked product of a flexible polymer and a rigid organic substance. The invention also provides a preparation method of the material. The material constructed by the step-by-step chemical coating idea of ​​the present invention has better mechanical and chemical stability, can effectively weaken the negative impact of moisture erosion in the air, and at the same time inhibit the dissolution of transition metal ions in the electrolyte to protect the positive electrode The material matrix is ​​protected from the corrosion of HF, which significantly improves the cycle stability of the material.

Description

technical field [0001] The invention belongs to the technical field of preparation of lithium-ion battery electrode materials, and relates to a preparation method of a surface-modified lithium-nickel cobaltate lithium cathode material for a lithium-ion battery. Background technique [0002] At present, the energy used by human society mainly comes from the transformation of fossil energy such as oil, coal and natural gas. There are two main problems with these forms of energy. One is insufficient reserves, and the other is environmental pollution caused by these fossil energy sources. In order to develop a low-carbon green economy and energy transition, the development and utilization of renewable and clean resources is very urgent. Rechargeable lithium-ion batteries (LIB) have the advantages of high energy density, large output power, high voltage, small self-discharge, wide operating temperature range, no memory effect and environmental friendliness, and have been used i...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): H01M4/62H01M4/36H01M4/485H01M4/505H01M4/525H01M10/0525
CPCH01M4/366H01M4/485H01M4/505H01M4/525H01M4/628H01M10/0525H01M2004/021H01M2004/028Y02E60/10
Inventor 曹雁冰胡国荣杜柯彭忠东范举张柏朝吴家辉
Owner CENT SOUTH UNIV
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