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Lithium-nickel-cobalt-manganese oxide composite material particle and preparation method thereof as well as battery

A composite material, lithium-nickel-cobalt-manganese technology, applied in the direction of battery electrodes, secondary batteries, non-aqueous electrolyte storage battery electrodes, etc. Covering and other issues, to achieve the effect of good electrochemical performance

Active Publication Date: 2012-02-08
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-cobalt-manganese oxide composite material particle and preparation method thereof as well as battery
  • Lithium-nickel-cobalt-manganese oxide composite material particle and preparation method thereof as well as battery
  • Lithium-nickel-cobalt-manganese oxide composite material particle and preparation method thereof as well as battery

Examples

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Embodiment 1

[0048] The positive electrode active material particles are lithium cobaltate particles. The aluminum phosphate-lithium cobalt oxide composite material particles include lithium cobalt oxide particles and an aluminum phosphate layer coated on the surface of the lithium cobalt oxide particles.

[0049] In the preparation of the aluminum phosphate-lithium cobaltate composite material particles, 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. The aluminum phosphate-lithium cobaltate composite particle samples were prepared under the conditions that the heat treatment temperature was 400° C. to 600° C., and the aluminum phosphate layer accounted for 1% by mass of the total mass. see figure 2 and image 3 , in the obtained...

Embodiment 2

[0051] The positive electrode active material particles are lithium nickel cobalt manganese oxide particles, and the chemical formula is LiN 1 / 3 co 1 / 3 mn 1 / 3 o 2 . The aluminum phosphate-lithium nickel cobalt manganese oxide composite particle comprises lithium nickel cobalt manganese oxide particle and an aluminum phosphate layer coated on the surface of the lithium nickel cobalt manganese oxide particle.

[0052] The preparation method of the aluminum phosphate-lithium nickel cobalt manganese oxide composite material particles is the same as the preparation method of the aluminum phosphate-lithium cobalt oxide composite material particles in the above-mentioned Example 1, and the heat treatment temperature is 600°C. The aluminum phosphate-lithium nickel cobalt manganese oxide composite particle is used as the positive electrode active material, mixed with a certain proportion of conductive agent and binder and evenly coated on the surface of the positive electrode curren...

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Abstract

The invention relates to a lithium-nickel-cobalt-manganese oxide composite material particle, which comprises an anode active material particle and an aluminum phosphate layer coated on the surface of the anode active material particle, wherein the material of the anode active material particle is shown by a chemical formula: Li xNiaCobMncMdO2, wherein x is not less than 0.1 but is not greater than 1.1, a is greater than 0 but is less than 1, b is greater than 0 but is less than 1, c is greater than 0 but is less than 1, d is not less than 0 but is not greater than 0.2, a+b+c+d is equal to 1, and M is selected from one or several of alkali metal elements, alkaline-earth metal elements, XIII-family elements, XIV-family elements, transition-family elements and rare-earth elements. The invention also relates to a preparation method for the lithium-nickel-cobalt-manganese oxide composite material particle and a lithium ion battery.

Description

technical field [0001] The invention relates to a lithium nickel cobalt manganese oxide composite material particle and a preparation method thereof, and a lithium ion battery, in particular to a lithium nickel cobalt manganese oxide composite material particle formed by compounding with aluminum phosphate and a preparation method thereof, and a lithium ion battery 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 oth...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H01M4/13H01M4/139H01M10/0525
CPCY02E60/10
Inventor 黄贤坤何向明姜长印王丹高剑李建军
Owner TSINGHUA UNIV
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