Spinel lithium manganate composite material and preparation method thereof as well as lithium ion battery

A technology of spinel lithium manganese oxide and composite materials, 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 uneven aluminum phosphate coating layer and other issues to achieve 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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  • Spinel lithium manganate composite material and preparation method thereof as well as lithium ion battery
  • Spinel lithium manganate composite material and preparation method thereof as well as lithium ion battery
  • Spinel lithium manganate composite material and preparation method thereof as well as 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 100 g. 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 ...

Embodiment 2

[0044] In this embodiment, the positive electrode active material particles are spinel lithium manganate particles, and the chemical formula is LiMn 2 o 4 . The aluminum phosphate-spinel lithium manganate composite material includes spinel lithium manganate particles and an aluminum phosphate layer coated on the surface of the spinel lithium manganate particles.

[0045] The preparation method of the aluminum phosphate-spinel lithium manganese oxide composite material is the same as the preparation method of the aluminum phosphate-lithium cobalt oxide composite material in the above-mentioned Example 1, the heat treatment temperature is selected as 600°C, and the aluminum phosphate layer accounts for the mass percentage of the total mass The difference is 1%, and the only difference is that the material of the positive electrode active material particles is spinel lithium manganese oxide. The aluminum phosphate-spinel lithium manganate composite material was used as the posi...

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Abstract

The invention relates to a spinel lithium manganate composite material which comprises positive active material particles and aluminium phosphate layers covering the surfaces of the positive active material particles, wherein the positive active material particles are spinel lithium manganate or doped spinel lithium manganate particles. The invention also relates to a preparation method for the spinel lithium manganate composite material and a lithium ion battery.

Description

technical field [0001] The invention relates to a spinel lithium manganate 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 L...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H01M4/525H01M4/136H01M4/1397H01M10/0525
CPCY02E60/122Y02E60/10
Inventor 何向明黄贤坤王丹姜长印李建军高剑
Owner TSINGHUA UNIV
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