Lithium titanate composite material and preparation method thereof and lithium ion battery

A technology of lithium-ion batteries and composite materials, which is applied in the field of lithium titanate composite materials and its preparation, can solve problems such as difficult large-scale industrial application, poor cycle performance of lithium-ion batteries, and inability to ensure uniform coating, etc., to achieve good The effect of electrochemical performance

Active Publication Date: 2014-03-26
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 titanate composite material and preparation method thereof and lithium ion battery
  • Lithium titanate composite material and preparation method thereof and lithium ion battery
  • Lithium titanate composite material and preparation method thereof and lithium ion battery

Examples

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Embodiment 1

[0045] In this embodiment, the electrode active material particles are positive electrode active material lithium cobalt oxide 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 100g. The phosphate solution is (NH 4 ) 2 HPO 4 aqueous solution. The (NH 4 ) 2 HPO 4 with Al(NO 3 ) 3 The molar ratio is 1:1. Three kinds of aluminum phosphate-lithium cobalt oxide composite particle samples were prepared under the conditions that the heat treatment temperatur...

Embodiment 2

[0049] In this embodiment, the electrode active material particles are negative electrode active material lithium titanate particles, and the chemical formula is Li 4 Ti 5 o 12 . The aluminum phosphate-lithium titanate composite material includes lithium titanate particles and an aluminum phosphate layer coated on the surface of the lithium titanate particles.

[0050] 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 difference is only in that the material of the electrode active material particles is lithium titanate. The aluminum phosphate-lithium titanate composite material is used as the negative electrode active material, mixed with a certain prop...

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Abstract

The invention relates to a lithium titanate composite material which comprises lithium titanate particles and an aluminum phosphate layer cladded on the surface of the lithium titanate particles. The invention also relates to a preparation method of a lithium nickelate composite material, and a lithium ion battery.

Description

technical field [0001] The invention relates to a lithium titanate 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 Patents(China)
IPC IPC(8): H01M4/13H01M4/139H01M10/0525
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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