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 difficulty in large-scale industrial application, uneven coating of aluminum phosphate, and poor cycle performance of lithium-ion batteries. The effect of good electrochemical performance

Active Publication Date: 2012-05-16
TSINGHUA UNIV +1
View PDF6 Cites 7 Cited by
  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

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

the structure of the environmentally friendly knitted fabric provided by the present invention; figure 2 Flow chart of the yarn wrapping machine for environmentally friendly knitted fabrics and storage devices; image 3 Is the parameter map of the yarn covering machine
View more

Image

Smart Image Click on the blue labels to locate them in the text.
Viewing Examples
Smart Image
  • 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

Experimental program
Comparison scheme
Effect test

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 formed by aluminum nitrate in ethanol. The volume of the aluminum nitrate solution is 30 ml, and the molar concentration is 0.16 mol / L. The added amount of the lithium cobalt oxide particles is 100 g. 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 samples of aluminum phosphate-lithium cobaltate composite particles were prepared under the conditions that the heat treatment temperature was 400° C., 500...

Embodiment 2

[0049] In this embodiment, the electrode active material particles are anode 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 of 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 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 proportion of conductive agent and binder and un...

the structure of the environmentally friendly knitted fabric provided by the present invention; figure 2 Flow chart of the yarn wrapping machine for environmentally friendly knitted fabrics and storage devices; image 3 Is the parameter map of the yarn covering machine
Login to view more

PUM

PropertyMeasurementUnit
thicknessaaaaaaaaaa
particle diameteraaaaaaaaaa
particle diameteraaaaaaaaaa
Login to view more

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 and a preparation method thereof, and a lithium ion battery. Background technique [0002] Using other materials to coat the particle surface of the positive electrode active material of a lithium ion battery 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 the 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 document "Correlation between AlPO 4 nanoparticle coating thickness on LiCoO 2 ca...

Claims

the structure of the environmentally friendly knitted fabric provided by the present invention; figure 2 Flow chart of the yarn wrapping machine for environmentally friendly knitted fabrics and storage devices; image 3 Is the parameter map of the yarn covering machine
Login to view more

Application Information

Patent Timeline
no application Login to view more
Patent Type & Authority Applications(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
Who we serve
  • R&D Engineer
  • R&D Manager
  • IP Professional
Why Eureka
  • Industry Leading Data Capabilities
  • Powerful AI technology
  • Patent DNA Extraction
Social media
Try Eureka
PatSnap group products

Browse by: Latest US Patents, China's latest patents, Technical Efficacy Thesaurus, Application Domain, Technology Topic.

© 2024 PatSnap. All rights reserved.Legal|Privacy policy|Modern Slavery Act Transparency Statement|Sitemap