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Lithium ion battery electrode composite material and preparation method and battery thereof

A technology for lithium ion batteries and composite materials, applied in the field of lithium ion battery electrode composite materials and their preparation, can solve the problems of poor cycle performance of lithium ion batteries, insufficient uniformity of aluminum phosphate coating layer, etc., to improve thermal stability and The effect of maintaining battery capacity and avoiding side reactions

Active Publication Date: 2012-05-30
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
Therefore, the cycle performance of the lithium-ion battery using the positive electrode active material is not good.

Method used

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  • Lithium ion battery electrode composite material and preparation method and battery thereof
  • Lithium ion battery electrode composite material and preparation method and battery thereof
  • Lithium ion battery electrode composite material and preparation method and battery thereof

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0056] Embodiment 1: the preparation of lithium ion battery modifier

[0057] 34.5 g of 85% H 3 PO 4 and 14 grams of deionized water were added into a beaker to form a solution; the solution was magnetically stirred at 80°C for 5 minutes; 5.9 grams of Al(OH) 3 Join in the above-mentioned beaker, react 2 hours, the solution in the described beaker generates a sol-like liquid; Then, in this beaker, add 2.5 grams of CrO 3 powder, continue to react for 2 hours, so that the product in the beaker becomes a clear red solution.

[0058] (2) Application of modifiers for lithium-ion batteries

[0059] (1) For Li-ion battery current collector

[0060] The above lithium ion battery modifiers can be used to improve the stability of lithium ion batteries. Taking the current collector of lithium-ion battery as an example, since the modifier is a clear solution, it is easy to coat evenly on the surface of the current collector of lithium-ion battery, and after coating, drying and other t...

Embodiment 2

[0081] Embodiment 2: the preparation of lithium ion battery current collector

[0082] In the embodiment of the present invention, the lithium ion battery current collector with a protective film is prepared by using the above lithium ion battery modifier. In the embodiment of the present invention, aluminum foil is selected as the metal sheet, the thickness of the metal sheet is 20 μm, and the width is 30 mm. The preparation process of the lithium ion battery current collector is as follows: add 0.5ml of triton and 30ml of water to the lithium ion battery modifier prepared above, and ultrasonically vibrate for 20 minutes to make it mix uniformly; The modifier is coated on the surface of the aluminum foil to form a coating layer; then the aluminum foil with the coating layer is placed in an oven at 80°C to dry for 0.5 hours, and finally the aluminum foil with the coating layer is put into the muffle furnace, Insulated at 200° C. for 1 hour to obtain the lithium ion battery cu...

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Abstract

The invention relates to a lithium ion battery electrode composite material which comprises an electrode active material particle and a protective film coated on the electrode active material particle. The component of the protective film is one of AlxMyPO4 and AlxMy(PO3)3, or a mixture of the two substances, wherein the valence state of M is k, and M is one or a mixture of more than one of Cr, Zn, Cu, Mg, Zr, Mo, V, Nb, and Ta; 0<x<1, 0<y<1, and 3x+ky=3. The invention also relates to a preparation method of the lithium ion battery electrode composite material, which comprises the following steps: providing a lithium ion battery modifier and the electrode active material particles, wherein the modifier comprises a mixture of a phosphorus source containing phosphate groups, a trivalent aluminium source and a metal oxide in a liquid phase solvent; mixing the electrode active material particles and the lithium ion battery modifier to form a mixture, drying and performing heat treatment of the mixture. In addition, according to the invention, the electrode composite material is applied to lithium ion batteries.

Description

technical field [0001] The invention relates to a lithium ion battery electrode composite material, a preparation method thereof, and a lithium ion battery containing the electrode composite material. Background technique [0002] At present, with the rapid development of electric vehicles and portable electronic devices such as mobile phones, digital cameras and notebook computers, the market demand for high-power, high-energy-density batteries is increasing. Lithium-ion battery is the battery with the highest voltage and the largest energy density among the batteries that have been practical so far, and has a good development prospect. [0003] 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 LiCoO 2 , LiNi...

Claims

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Application Information

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IPC IPC(8): H01M4/58H01M4/1397H01M10/0525
CPCY02E60/122Y02E60/10
Inventor 何向明李建军张丽春任建国高剑蒲薇华
Owner TSINGHUA UNIV
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