Positive pole piece and preparation method thereof and battery

A positive electrode plate, positive electrode active technology, applied in the direction of battery electrodes, circuits, electrical components, etc., can solve the problems of greater safety and hidden dangers of batteries, and achieve the effect of increasing internal resistance

Inactive Publication Date: 2013-06-19
SHENZHEN OCEANSUN BATTERY
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0004] In order to overcome the problem in the prior art that there is a large potential safety hazard when the battery is overcharged, the present invention provides a positive pole piece, which has good overcharge performance and greatly improves the safety of the battery

Method used

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  • Positive pole piece and preparation method thereof and battery
  • Positive pole piece and preparation method thereof and battery
  • Positive pole piece and preparation method thereof and battery

Examples

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preparation example Construction

[0025] At the same time, the present invention also discloses a method for preparing the above-mentioned positive electrode sheet, including:

[0026] S1. Mix the phosphate, the first conductive agent, and the first binder uniformly in a mass ratio of 40-90:5-10:5-50, and add a solvent to obtain a buffer conductive layer slurry, wherein the buffer conductive layer slurry The solid content is 10-50%, and the viscosity is 200-1500Pa·s;

[0027] S2, coating the buffer conductive layer slurry on the positive electrode current collector, baking, and forming a buffer conductive layer with a thickness of 2-50 μm on the positive electrode current collector;

[0028] S3, forming a positive electrode active layer on the surface of the buffer conductive layer.

[0029] The solvent in the above step S1 is N-methylpyrrolidone or deionized water.

[0030] In the present invention, as in step S1, when preparing the buffer conductive layer, the solid content is adjusted to 10-50%, and the v...

Embodiment 1

[0045] This embodiment is used to illustrate the positive electrode sheet disclosed in the present invention and its preparation method.

[0046] Buffer conductive layer slurry preparation:

[0047] 16 g LiCoPO 4 active material (D 50 Less than 5μm), 4 grams of conductive carbon powder Super-P (D 50 less than 50 μm), 20 grams of binder PAA, mixed with 60 grams of deionized water and stirred to adjust the viscosity to 800-1200 Pa·s, and passed through a 200-mesh sieve. Coated on a 14μm aluminum foil current collector and baked in vacuum at 85°C for 1 hour. A buffer conductive layer was formed to a thickness of 25 μm.

[0048] Positive pole piece preparation:

[0049] Weigh 95 grams of lithium cobaltate active material, 2 grams of conductive carbon powder, and 3 grams of binder PVDF to mix, add 200 grams of NMP and stir to obtain active material slurry, and coat it on the aluminum aggregate treated with coating slurry On the fluid, control the drying temperature and coatin...

Embodiment 2

[0057] This embodiment is used to illustrate the positive electrode sheet disclosed in the present invention and its preparation method.

[0058] Buffer conductive layer slurry preparation:

[0059] 16 g LiFePO 4 active material (D 50 Less than 2μm), 4 grams of conductive carbon powder Super-P (D 50 less than 50 μm), 20 grams of binder PAA, mixed with 60 grams of deionized water and stirred to adjust the viscosity to 800-1200 Pa·s, and passed through a 200-mesh sieve. Coated on a 14μm aluminum foil current collector and baked in vacuum at 85°C for 1 hour. A buffer conductive layer was formed to a thickness of 25 μm.

[0060] The positive electrode sheet preparation, battery preparation method and testing method are the same as in Example 1.

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Abstract

The invention provides a positive pole piece which is characterized by comprising a positive pole current collector, a buffer conducting layer and a positive pole active layer in a sequential stacking mode. The buffer conducting layer comprises phosphate, a first conductive agent and a first binder. The phosphate has the following general formula: LiMPO4, wherein M is selected from one of Fe, Mn and Co or a composite of a plurality of Fe, Mn and Co. The thickness of the buffer layer is 2-50 millimeters, and the grain size of the first conductive agent is smaller than 75 millimeters. In the buffer conductive layer, the phosphate content is 40-90wt%, the first conductive agent content is 5-10wt%, and the first binder content is 5-50wt%. Meanwhile, the invention further discloses a preparation method of the positive pole piece and a battery adopting the positive pole piece. The battery prepared from the provided positive pole piece has good over-charging performance and the safety of the battery is greatly promoted.

Description

technical field [0001] The invention relates to a positive pole piece, a preparation method thereof, and a battery using the positive pole piece. Background technique [0002] Lithium-ion battery is a rechargeable secondary battery. Lithium-ion battery is widely used in various portable electronic products due to its large capacity, safety and high volume energy density. At present, large-scale electrical equipment, such as energy storage, electric vehicles, etc. and other fields to form a huge application scale. [0003] With the development of batteries in the direction of high energy density, the capacity of single batteries is getting higher and higher, and the safety performance is getting more and more attention. Especially in abuse, it is easy to cause internal micro-short circuit due to the failure of the charging device and overcharging of the battery. , and then thermal runaway has a great potential safety hazard. Contents of the invention [0004] In order to ...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H01M4/136H01M4/1397H01M4/62
CPCY02E60/10
Inventor 王涛
Owner SHENZHEN OCEANSUN BATTERY
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