Anode composite material, preparation method thereof and lithium ion battery

一种锂离子电池、复合材料的技术，应用在正极复合材料及其制备领域，能够解决导电性降低、磷酸铝导电性差等问题，达到提高导电性、好导电性的效果

Active Publication Date: 2012-07-11
TSINGHUA UNIV +1
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

[0003] However, due to the poor conductivity of aluminum phosphate itself, the conductivity of the above-mentioned electrode active materials will also be reduced due to the coating of aluminum phosphate.

Method used

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  • Anode composite material, preparation method thereof and lithium ion battery
  • Anode composite material, preparation method thereof and lithium ion battery
  • Anode composite material, preparation method thereof and lithium ion battery

Examples

Experimental program
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preparation example Construction

[0022] An embodiment of the present invention provides a method for preparing the above-mentioned electrode composite material 10, which includes the following steps:

[0023] Step 1, providing a trivalent aluminum source and a dopant element source, adding the trivalent aluminum source and the dopant element source into a solvent to form a solution containing trivalent aluminum ions and dopant ions;

[0024] Step 2, adding the electrode active material particles to be coated into the solution containing trivalent aluminum ions and dopant ions to form a mixture;

[0025] Step 3, adding the phosphate source solution to the mixture for reaction, so that a doped aluminum phosphate layer is formed on the surface of the electrode active material particles, and the material of the doped aluminum phosphate layer is semiconductor-doped aluminum phosphate; and

[0026] Step 4, heat-treating the electrode active material particles with the doped aluminum phosphate layer on the surface.

...

Embodiment

[0038] In this embodiment, the lithium ion battery electrode composite material 10 is a positive electrode composite material, and the positive electrode composite material is a lithium cobalt oxide composite material. Wherein, the electrode active material particles 12 are undoped lithium cobalt oxide particles, and the composition of the doped aluminum phosphate layer 14 is Al 0.95 Ni 0.05 PO 4 . The thickness of the doped aluminum phosphate layer 14 is 10 nanometers, and the mass percentage in the electrode composite material 10 is 1%.

[0039] In the preparation process of the above-mentioned lithium cobaltate composite material particles, first dissolve aluminum nitrate and nickel nitrate in ethanol to form a solution containing trivalent aluminum ions and nickel ions, wherein aluminum nitrate and nickel nitrate are based on the ratio of Al:Ni to 0.95:0.05 Molar weight was weighed. The above-mentioned solution containing trivalent aluminum ions and nickel ions has a v...

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Abstract

The invention relates to an anode composite material of a lithium ion battery, which comprises anode activity material particles. The anode composite material further comprises a mingled aluminum phosphate layer wrapped on the surface of the anode activity material particles, and the material of the mingled aluminum phosphate layer is semiconductor doped aluminum phosphate. A preparation method of the anode composite material of the lithium ion battery and the lithium ion battery are further provided.

Description

technical field [0001] The invention relates to a positive electrode composite material, a preparation method thereof, and a lithium ion battery using the positive electrode composite material. Background technique [0002] Lithium-ion batteries are mainly composed of electrodes, separators, and electrolytes. Among them, the development of lithium-ion batteries largely depends on the improvement of the performance of electrode active materials. At present, the positive electrode active materials of lithium-ion batteries mainly include lithium cobalt oxide (LiCoO 2 ), lithium nickelate (LiNiO 2 ), lithium manganate (LiMn 2 o 4 ) and lithium ferrite (LiFePO 4 ), etc.; the negative electrode active materials are mainly carbon materials, lithium titanate (Li 4 Ti 5 o 12 )Wait. In order to improve the performance of lithium-ion battery electrode active materials, coating the particle surface of lithium-ion battery electrode active materials with other materials is a comm...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H01M4/58H01M4/1397H01M10/0525
CPCH01M4/5825Y02E60/122H01M4/366H01M4/485H01M4/131Y02E60/10
Inventor 黄贤坤何向明姜长印王丹高剑李建军
Owner TSINGHUA UNIV
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