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Lithium ion battery and positive plate thereof

A lithium-ion battery and positive electrode technology, which is applied to non-aqueous electrolyte battery electrodes, secondary batteries, circuits, etc., can solve the problem of not being able to achieve a good heat insulation effect, and can prevent burning or explosion, reduce quality, and improve The effect of energy density

Inactive Publication Date: 2014-05-14
NINGDE AMPEREX TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0010] Coating a layer of nano-scale inorganic coating or polymer coating on the surface of the positive electrode can prevent the transfer of heat to a certain extent, but it is limited to the size of its thermal conductivity and cannot play a good heat insulation effect.

Method used

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  • Lithium ion battery and positive plate thereof
  • Lithium ion battery and positive plate thereof

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0033] The positive active material is lithium cobalt oxide (LiCoO 2 ), the binder uses polyvinylidene fluoride (PVDF), the conductive agent uses conductive carbon Super-P, the solvent uses N-methylpyrrolidone (NMP), and LiCoO 2 : PVDF: Super-P is mixed in NMP at a weight ratio of 95:2:3, and a uniformly dispersed positive electrode slurry is obtained by high-speed stirring; the positive electrode slurry is coated on an aluminum foil, blown and dried, and coated by rolling. A positive electrode membrane covered with a positive electrode active material layer.

[0034] Similarly, a heat-insulating hollow particle Al with a particle size of 0.5 μm 2 o 3 As the raw material of the heat insulation layer, its hollow volume accounts for 50±5% of the volume of the entire small particle, and the selected hollow particle Al 2 o 3 Mix with binder PVDF and solvent NMP, and stir at a high speed to obtain a uniformly dispersed heat-insulating layer slurry; apply the heat-insulating lay...

Embodiment 2

[0036] The positive active material is LiCoO 2 , the binder uses polyvinylidene fluoride, the conductive agent uses conductive carbon Super-P, the solvent uses NMP, and LiCoO 2 : PVDF: Super-P is mixed in NMP at a weight ratio of 95:2:3, and a uniformly dispersed positive electrode slurry is obtained by high-speed stirring; the positive electrode slurry is coated on an aluminum foil, blown and dried, and coated by rolling. A positive electrode membrane covered with a positive electrode active material layer.

[0037]Similarly, the heat-insulating hollow particle MgO with a particle size of 0.5 μm is selected as the raw material of the heat-insulating layer, and its hollow volume accounts for 40±5% of the volume of the entire small particle. The selected hollow particle MgO is combined with the binder PVDF, solvent NMP mixed, and stirred at high speed to obtain a uniformly dispersed heat-insulating layer slurry; apply the heat-insulating layer slurry on the positive electrode ...

Embodiment 3

[0039] The positive active material is LiCoO 2 , the binder uses polyvinylidene fluoride, the conductive agent uses conductive carbon Super-P, the solvent uses NMP, and LiCoO 2 : PVDF: Super-P is mixed in NMP at a weight ratio of 95:2:3, and a uniformly dispersed positive electrode slurry is obtained by high-speed stirring; the positive electrode slurry is coated on an aluminum foil, blown and dried, and coated by rolling. A positive electrode membrane covered with a positive electrode active material layer.

[0040] Similarly, heat-insulating hollow particle aluminum silicate with a particle size of 1 μm is selected as the raw material of the heat-insulation layer, and its hollow volume accounts for 50±5% of the entire small particle volume, and the selected hollow particle aluminum silicate and binder PVDF and solvent NMP are mixed, and a uniformly dispersed heat-insulating layer slurry is obtained by high-speed stirring; the heat-insulating layer slurry is coated on the po...

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Abstract

The invention discloses a lithium ion battery positive plate. The lithium ion battery positive plate comprises a positive current collector and a positive active substance layer distributed on the positive current collector, wherein a heat insulation layer is distributed on the positive active substance layer; the heat insulation layer comprises small hollow heat insulation grains and a binding agent; the ratio of the hollow volumes of the small hollow heat insulation grains to the volumes of the small hollow heat insulation grains is 0.3-0.7. Furthermore, the invention further discloses a lithium ion battery adopting the lithium ion battery positive plate. The lithium ion battery has the ideal safety; when the lithium ion battery has inner short circuit or is overcharged, the small hollow heat insulation grains in the heat insulation layer of the positive plate can effectively prevent heat from being transmitted to the positive plate and causing thermal runaway of the positive plate, and prevent the lithium ion battery from being combusted or exploded.

Description

technical field [0001] The invention belongs to the field of lithium-ion batteries, and more specifically, the invention relates to a lithium-ion battery with ideal safety and a positive electrode sheet thereof. Background technique [0002] Lithium-ion batteries have the advantages of small size, high energy and no pollution, so they have been widely used in mobile devices, high-power power equipment (electric vehicles) and energy storage power stations. With the widespread application of lithium-ion batteries, the importance of their safety has become increasingly prominent. How to ensure the safety of lithium-ion batteries has become an important research topic for major lithium battery manufacturers. [0003] The possible safety problems of lithium-ion batteries mainly include: due to improper use of the battery or other reasons, the battery is overcharged; the battery is used in a harsh environment (such as impact, high temperature for a long time), resulting in a serio...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H01M4/13H01M10/0525
CPCH01M4/13H01M10/0525Y02E60/10
Inventor 武卫忠陈小波
Owner NINGDE AMPEREX TECH
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