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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  • 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

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
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Example Embodiment

[0056] Example 1: Preparation of Lithium Ion Battery Modifier

[0057] 34.5 grams of 85% H 3 PO 4 And 14 grams of deionized water were added to the beaker to prepare a solution; the solution was magnetically stirred at 80°C for 5 minutes; 5.9 grams of Al(OH) 3 Add to the beaker, react for 2 hours, the solution in the beaker forms a sol-like liquid; then, add 2.5 grams of CrO to the beaker 3 Powder, continue to react for 2 hours, so that the product in the beaker becomes a clear red solution.

[0058] (2) Application of lithium ion battery modifier

[0059] (1) Used for lithium ion battery current collector

[0060] The above-mentioned lithium ion battery modifiers can be used to improve the stability of lithium ion batteries. Take the lithium ion battery current collector as an example. Because the modifier is a clear solution, it is easy to uniformly coat the surface of the lithium ion battery current collector, and after coating, it can be uniformly and uniformly formed on the surfa...

Example Embodiment

[0081] Example 2: Preparation of current collector for lithium ion battery

[0082] The embodiment of the present invention uses the above-mentioned lithium ion battery modifier to prepare a lithium ion battery current collector with a protective film. In the embodiment of the present invention, aluminum foil is selected as the metal sheet, and the metal sheet has a thickness of 20 μm and a width of 30 mm. The preparation process of the lithium ion battery current collector is as follows: add 0.5 ml of Triton and 30 ml of water to the lithium ion battery modifier prepared above, and ultrasonically shake for 20 minutes to make it uniform; The modifier is applied to the surface of the aluminum foil to form a coating layer; then the coated aluminum foil is placed in an oven at 80°C for 0.5 hours, and finally the coated aluminum foil is placed in a muffle furnace. Incubate at 200°C for 1 hour to obtain the lithium ion battery current collector with protective film prepared in the em...

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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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