Positive plate and secondary battery

A cathode sheet and cathode film technology, applied in battery electrodes, circuits, electrical components, etc., can solve the problems of soaring heat production, thermal runaway, combustion, etc., to achieve good discharge capacity, ensure stability, and improve safety performance.

Active Publication Date: 2018-03-09
NINGDE AMPEREX TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

If the adhesion and cohesion between the Al foil and the positive electrode diaphragm are poor, the positive electrode diaphragm will fall off from the Al foil during the process of nail penetration or heavy impact, resulting in direct contact between the Al foil and the negative electrode diaphragm, resulting in The heat soars instantly, which can easily cause thermal runaway, and in severe cases, safety problems such as fire, combustion, and explosion will occur

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0048] (1) Preparation of the second binder

[0049] In parts by weight, take 100 parts of E44 epoxy resin, 8 parts of curing agent dicyandiamide, 1 part of accelerator chlorourea, and 1 part of toughening agent dioctyl phthalate, stir on a planetary mixer to obtain a uniform mixture the second binder.

[0050] (2) Preparation of cathode slurry

[0051] At room temperature, mix the positive electrode active material LCO, the conductive agent SP, the first binder PVDF (model is HSV900), and the second binder in a weight ratio of 95:2:2:1, and add the solvent N-methylpyrrolidone (NMP), through high-speed stirring to obtain a homogeneously mixed positive electrode slurry.

[0052] (3) Preparation of positive electrode sheet

[0053] The positive electrode slurry is evenly coated on both sides of the positive electrode current collector aluminum Al foil with a thickness of 12 μm by using a coating machine. After drying at room temperature, it is transferred to an oven at 130 ° ...

Embodiment 2

[0059] The preparation process of lithium ion secondary battery is identical with embodiment 1, difference is:

[0060] (1) Preparation of the second binder

[0061] In terms of parts by weight, take 100 parts of E51 epoxy resin, 15 parts of curing agent adipic acid dihydrazide, and 1 part of toughening agent dioctyl phthalate, and stir on a planetary mixer to obtain a uniformly mixed second viscous Binder.

[0062] (3) Preparation of positive electrode sheet

[0063]Use a coating machine to evenly coat the positive electrode slurry on both sides of the aluminum foil of the positive electrode current collector with a thickness of 12 μm, dry it at room temperature, transfer it to an oven at 120°C to dry for 5 minutes, and then pass through a roller press machine for compaction, stripping, and cutting The positive electrode sheet is obtained after the sheet. The fan frequency of the coating machine is 35Hz-50Hz, and the belt speed is 5m / min.

Embodiment 3

[0065] The preparation process of lithium ion secondary battery is identical with embodiment 1, difference is:

[0066] (1) Preparation of the second binder

[0067] In parts by weight, take 100 parts of Ex48 epoxy resin, 5 parts of curing agent boron trifluoride monoethylamine complex, and 1 part of toughening agent dioctyl phthalate, stir on a planetary mixer to obtain a uniform mixture the second binder.

[0068] (3) Preparation of positive electrode sheet

[0069] Use a coating machine to evenly coat the positive electrode slurry on both sides of the aluminum foil of the positive electrode current collector with a thickness of 12 μm, dry it at room temperature, transfer it to an oven at 120°C to dry for 5 minutes, and then pass through a roller press machine for compaction, stripping, and cutting The positive electrode sheet is obtained after the sheet. The fan frequency of the coating machine is 35Hz-50Hz, and the belt speed is 5m / min.

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Abstract

The invention provides a positive plate and a secondary battery. The positive plate comprises: a positive current collector and a positive diaphragm arranged on the positive current collector. The positive diaphragm comprises a positive active material, a conductive agent, a first binder and a second binder. The first binder comprises a fluorine-containing polymer. The second binder comprises epoxy resin, a curing agent and an alternative accelerant. The positive plate has a higher binding power and cohesion, and the safety performance of the secondary battery using the positive plate can be improved accordingly. The secondary battery also has a good discharge capacity, rate capability, high-temperature storage performance and cycle performance. The positive plate can ensure the performance stability of the secondary battery in a batch production process.

Description

technical field [0001] The invention relates to the technical field of batteries, in particular to a positive electrode sheet and a secondary battery. Background technique [0002] The safety performance test of the secondary battery includes items such as nail penetration, heavy impact, extrusion, drop, overshoot, overdischarge, thermal shock, high temperature and high humidity, etc. Among the many safety performance test items, the nail penetration test is the most important and important One of the more difficult problems to solve. In the research on the failure mechanism of nail penetration, the failure modes of nail penetration mainly include the following four types: (1) the positive electrode current collector Al foil is in contact with the negative electrode diaphragm; (2) the positive electrode current collector Al foil is in contact with the negative electrode current collector Cu foil; ( 3) The positive electrode diaphragm is in contact with the negative electrod...

Claims

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Application Information

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IPC IPC(8): H01M4/62
CPCH01M4/623Y02E60/10
Inventor 刘会会钟泽孙成栋王星会魏增斌郑义
Owner NINGDE AMPEREX TECH
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