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Lithium-ion secondary battery

A secondary battery and lithium-ion technology, applied in secondary batteries, non-aqueous electrolyte battery electrodes, circuits, etc., can solve the problems of brittle separators, complicated procedures, and complicated processes, so as to inhibit damage and improve safety performance Effect

Inactive Publication Date: 2010-05-26
DONGGUAN NEWPOWER ELECTRIC SCI & TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, the process of treating the separator in the above method is complicated, the thickness of the oxide layer is only 0.1-100nm, and the bonding performance between the oxide and the polymer material of the separator is not good, the separator is easy to be brittle, and the safety of the lithium-ion secondary battery poor performance
[0006] As another example, the US patent application US 2005 / 0266292 A1 published on December 1, 2005 also discloses a separator with a double-layer structure of a polymer layer and a ceramic oxide layer, wherein the ceramic oxide layer needs to undergo high temperature Heat treatment dries the sol to form an oxide layer, the process is complicated, and the safety performance is difficult to meet the actual use requirements

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0035] Preparation of positive electrode sheet: lithium cobalt oxide (LiCoO 2 ), conductive carbon black (Super-P), polyvinylidene fluoride (PVDF) mixed with N, N-dimethylpyrrolidone (NMP) in a weight ratio of 93:3:4, and stirred evenly to obtain a slurry coated with a positive electrode sheet The viscosity can be adjusted by NMP during the stirring process; then, the slurry coated with the positive electrode sheet is evenly coated on both sides of the 12 μm thick positive electrode current collector (aluminum foil) according to a certain width, and the positive electrode sheet coated with only one side is made at the same time ; Finally, through cold pressing, slicing (that is, cutting the pole piece and cutting it into the required size) to make the positive pole piece.

[0036] Preparation of the oxide layer: SiO with a particle size of 20nm 2 Disperse in acetone, add vinylidene fluoride-hexafluoropropylene copolymer (PVDF-HFP) as a binder, spread it through a stirring tan...

Embodiment 2

[0041] Preparation of the positive electrode sheet: lithium cobalt nickel manganese oxide (LiNiCoMnO 2 ), conductive carbon black (Super-P), polyvinylidene fluoride (PVDF) mixed with N, N-dimethylpyrrolidone (NMP) in a weight ratio of 95:2:3, and stirred evenly to obtain a slurry coated with a positive electrode sheet Material, the viscosity can be adjusted by NMP during the stirring process; then, the slurry coated with the positive electrode sheet is evenly coated on both sides of the 12 μm thick positive electrode current collector (aluminum foil) according to a certain width, and the positive electrode sheet coated with only one side is produced at the same time; Finally, cold pressing and slicing (that is, cutting and cutting the pole piece into the required size) are used to prepare the positive pole piece.

[0042] Preparation of the oxide layer: Al with a particle size of about 1 μm 2 o 3 Disperse in acetone, add SBR as a binder, disperse evenly through a stirring ta...

Embodiment 3

[0047] Preparation of the positive electrode sheet: lithium cobalt nickel manganese oxide (LiNiCoMnO 2 ), conductive carbon black (Super-P), polyvinylidene fluoride (PVDF) mixed with N, N-dimethylpyrrolidone (NMP) in a weight ratio of 95:2:3, and stirred evenly to obtain a slurry coated with a positive electrode sheet Material, the viscosity can be adjusted by NMP during the stirring process; then, the slurry coated with the positive electrode sheet is evenly coated on both sides of the 12 μm thick positive electrode current collector (aluminum foil) according to a certain width, and the positive electrode sheet coated with only one side is produced at the same time; Finally, cold pressing and slicing (that is, cutting and cutting the pole piece into the required size) are used to prepare the positive pole piece.

[0048] Preparation of the oxide layer: Sb with a particle size of 200nm 2 o 5 Disperse in water, add acrylic acid (PAA) as a binder, disperse evenly through a sti...

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Abstract

The invention discloses a lithium-ion secondary battery, which comprises a positive plate, a negative plate, an isolation membrane arranged between the positive plate and the negative plate, and electrolyte; the positive plate comprises a positive pole current collector and a positive pole active material distributed on the positive pole current collector; the negative plate comprises a negative pole current collector and a negative pole active material which is distributed on the negative pole current collector; and an insulating oxide layer is distributed on the surface of the positive plate. In the invention, the insulating oxide layer in the lithium-ion secondary battery can prevent the positive pole current collector from contacting the isolation membrane directly, absorb the HF in the electrolyte and inhibit the HF from damaging the positive pole and the negative pole, thereby effectively improving the safety property of the lithium-ion secondary battery.

Description

technical field [0001] The invention relates to a lithium ion secondary battery, in particular to a lithium ion secondary battery with good safety performance. Background technique [0002] With the development of modern society and science and technology, mobile devices such as video cameras, notebook computers, mobile DVDs and digital cameras are more and more widely used, and the demand for high-energy batteries is also increasing. As a green high-energy battery, lithium-ion secondary batteries are widely used in various mobile devices due to their advantages of high voltage, high energy density, and light weight. [0003] Lithium-ion secondary batteries generally include: a positive electrode sheet, a negative electrode sheet, a separator spaced between the positive and negative electrode sheets, and an electrolyte. The positive electrode sheet includes a positive electrode collector and a positive active material distributed on the positive electrode collector. The nega...

Claims

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Application Information

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IPC IPC(8): H01M10/0525H01M4/13
CPCY02E60/12Y02E60/122Y02E60/10
Inventor 涂健张小细赵新生王岳利张介威吴凯
Owner DONGGUAN NEWPOWER ELECTRIC SCI & TECH
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