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Lithium nickel oxide composite material and preparation method thereof and lithium ion battery

A composite material, lithium nickelate technology, applied in battery electrodes, secondary batteries, circuits, etc., can solve the problems of difficult large-scale industrial application, poor cycle performance of lithium ion batteries, and inhomogeneous aluminum phosphate coating. To achieve the effect of good electrochemical performance

Active Publication Date: 2012-05-09
TSINGHUA UNIV +1
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

Therefore, the aluminum phosphate coating layer formed on the surface of the positive electrode active material by the above method is not uniform enough, and it is impossible to ensure that the surface of each positive electrode active material can be uniformly coated with a layer of aluminum phosphate, so that the lithium ion battery using the positive electrode active material The cycle performance is not good, making this method difficult for large-scale industrial application

Method used

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  • Lithium nickel oxide composite material and preparation method thereof and lithium ion battery
  • Lithium nickel oxide composite material and preparation method thereof and lithium ion battery
  • Lithium nickel oxide composite material and preparation method thereof and lithium ion battery

Examples

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Embodiment 1

[0040] In this embodiment, the positive electrode active material particles are lithium cobaltate particles, and the chemical formula is LiCoO 2 . The aluminum phosphate-lithium cobalt oxide composite material includes lithium cobalt oxide particles and an aluminum phosphate layer coated on the surface of the lithium cobalt oxide particles.

[0041] In the preparation of the aluminum phosphate-lithium cobaltate composite material, the aluminum nitrate solution is a solution of aluminum nitrate in ethanol. The aluminum nitrate solution has a volume of 30 milliliters and a molar concentration of 0.16 mol / liter. The added amount of the lithium cobaltate particles is 100g. The phosphate solution is (NH 4 ) 2 HPO 4 aqueous solution. Three kinds of aluminum phosphate-lithium cobalt oxide composite particle samples were prepared under the conditions that the heat treatment temperatures were 400°C, 500°C and 600°C respectively, and the mass percentage of the aluminum phosphate l...

Embodiment 2

[0044] In this embodiment, the positive electrode active material particles are lithium nickelate particles, and the chemical formula is LiNiO 2 . The aluminum phosphate-lithium nickelate composite material includes lithium nickelate particles and an aluminum phosphate layer coated on the surface of the lithium nickelate particles.

[0045] The preparation method of the aluminum phosphate-lithium nickelate composite material is the same as the preparation method of the aluminum phosphate-lithium cobaltate composite material particles in the above-mentioned Example 1, the heat treatment temperature is selected to be 600 ° C, and the mass percentage of the aluminum phosphate layer to the total mass is 1.5 %, the only difference is that the material of the positive electrode active material particles is lithium nickelate. The aluminum phosphate-lithium nickelate composite material was used as the positive electrode active material, and a lithium ion battery was assembled under t...

Embodiment 3

[0047] In this embodiment, the positive electrode active material particles are lithium nickelate particles doped with cobalt and aluminum, and the chemical formula is LiNi 0.8 co 0.15 Al 0.05 o 2 . The aluminum phosphate-lithium nickelate composite material comprises the lithium nickelate particles doped with cobalt and aluminum and an aluminum phosphate layer coated on the surface of the lithium nickelate particles.

[0048] The preparation method of the aluminum phosphate-lithium nickelate composite material is the same as the preparation method of the aluminum phosphate-lithium cobaltate composite material particles in the above-mentioned Example 1, the heat treatment temperature is selected to be 600 ° C, and the mass percentage of the aluminum phosphate layer to the total mass is 1.5 %, the only difference is that the material of the positive electrode active material particles is lithium nickelate doped with cobalt and aluminum. The aluminum phosphate-lithium nickel...

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Abstract

The invention relates to a lithium nickel oxide composite material, which includes positive active substance particles and aluminum phosphate layers wrapping the surfaces of the positive active substance particles, wherein the material of the positive active substance particles is expressed by a chemical formula LixNi1-yMyO2, wherein x is greater than or equal to 0.1 and is less than or equal to 1.1; y is greater than or equal to 0 and is less than 1; and M is one or more selected from alkali metal elements, alkaline-earth metal elements, XIII group elements and IVA group elements, transition group elements and rare earth elements. The invention also relates to a preparation method of the lithium nickel oxide composite material and a lithium ion battery.

Description

technical field [0001] The invention relates to a lithium nickelate composite material, a preparation method thereof, and a lithium ion battery. 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 nanoparticle coating thickness on LiCoO 2...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H01M4/525H01M4/131H01M4/1391H01M10/0525
CPCY02E60/122Y02E60/10
Inventor 黄贤坤何向明姜长印王丹高剑李建军
Owner TSINGHUA UNIV
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