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Lithium nickel manganese oxide composite material, its preparation method and lithium ion battery

A lithium-nickel-manganese oxide and composite material technology, applied in battery electrodes, secondary batteries, circuits, etc., can solve problems such as difficulty in large-scale industrial application, inability to ensure uniform coating, and poor cycle performance of lithium-ion batteries , to achieve the effect of good electrochemical performance

Active Publication Date: 2013-03-13
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 manganese oxide composite material, its preparation method and lithium ion battery
  • Lithium nickel manganese oxide composite material, its preparation method and lithium ion battery
  • Lithium nickel manganese oxide composite material, its preparation method and lithium ion battery

Examples

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Embodiment 1

[0044] Embodiment 1: aluminum phosphate-lithium cobaltate composite material

[0045] 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.

[0046] 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, ...

Embodiment 2

[0055] Embodiment 2: aluminum phosphate-lithium nickel manganese oxide composite material

[0056] In this embodiment, the positive electrode active material particles are spinel-type lithium nickel manganese oxide particles, and the chemical formula is LiNi 0.5 mn 1.5 o 4 . The aluminum phosphate-lithium nickel manganese oxide composite material includes lithium nickel manganese oxide particles and an aluminum phosphate layer coated on the surface of the lithium nickel manganese oxide particles. The preparation method of the aluminum phosphate-lithium nickel manganese oxide composite material is the same as the preparation method of the aluminum phosphate-lithium cobaltate composite material particles in the above-mentioned Example 1, and the heat treatment temperature is selected as 600 ° C. The difference is only in the material of the positive electrode active material particles It is lithium nickel manganese oxide, and the mass percentage of the aluminum phosphate laye...

Embodiment 3

[0059] Embodiment 3: aluminum phosphate-spherical lithium nickel manganese oxide composite material

[0060] In this embodiment, the spherical lithium nickel manganese oxide is firstly synthesized by a controlled crystallization method, and then the spherical lithium nickel manganese oxide is coated with aluminum phosphate. The chemical formula of the spherical lithium nickel manganese oxide is LiNi 0.5 mn 1.5 o 4 . The aluminum phosphate-spherical lithium nickel manganese oxide composite material comprises spherical lithium nickel manganese oxide and an aluminum phosphate layer coated on the surface of the spherical lithium nickel manganese oxide.

[0061] The controlled crystallization synthesis method for preparing the spherical lithium nickel manganese oxide comprises the following steps:

[0062] Provide a soluble manganese source compound and a nickel source compound, dissolve and mix the soluble manganese source compound and nickel source compound in a solvent accor...

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Abstract

The invention relates to a lithium nickel manganese oxide composite material, which comprises anode active substance particles and aluminum phosphate layers coated on the surface of the anode active substance particles, an anode active substance particle material is expressed by a chemical formula of LixNi0.5+y-aMn1.5-y-bMaNbO4, wherein x is greater than or equal to 0.1 and less than or equal to 1.1, y is greater than or equal to 0 and less than 1.5, a-y is greater than or equal to 0 and less than 0.5, M and N are one or more selected from alkali metal elements, alkali earth metal, 13th element, 14th element, transitional element and rare earth element. The invention also relates to a preparation method of the lithium nickel manganese oxide composite material and a lithium ion battery.

Description

technical field [0001] The invention relates to a lithium nickel manganese oxide 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...

Claims

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Application Information

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IPC IPC(8): H01M4/505H01M4/525H01M4/1397H01M4/131H01M10/0525
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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