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Electrode plate and electrochemical device comprising same

An electrode pole piece and electrode active material technology, applied in the field of energy storage, can solve the problems of reducing the safety of battery cells, electrochemical short-circuit, etc., so as to improve uneven lithium deposition, improve safety, and reduce the probability of lithium dendrite formation. Effect

Active Publication Date: 2019-06-04
DONGGUAN POWERAMP TECH LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

The formation of lithium dendrites will to a large extent puncture the separator between the anode electrode and the cathode electrode, resulting in direct contact between the cathode electrode and the anode electrode, resulting in an electrochemical short circuit, which greatly reduces the safety of the cell.

Method used

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  • Electrode plate and electrochemical device comprising same
  • Electrode plate and electrochemical device comprising same
  • Electrode plate and electrochemical device comprising same

Examples

Experimental program
Comparison scheme
Effect test

preparation example Construction

[0114] Preparation of lithium-ion batteries

[0115] The cathode active material is prepared into a lithium ion battery by the following preparation method. Specifically, the cathode active material, conductive agent, and binder are fully stirred and mixed in N-methylpyrrolidone according to a certain weight ratio to make a cathode slurry, and then the obtained cathode slurry is evenly coated on the cathode current collector The front and back surfaces of the aluminum foil are dried at 85°C to obtain a cathode active material layer, and then cold pressed, stripped, cut into pieces, and cathode tabs are welded to obtain a cathode sheet.

[0116] Fully stir and mix the anode active material, binder, and dispersant in deionized water according to a certain weight ratio to make an anode slurry, and then evenly coat the anode slurry on the front and back of the anode current collector copper foil , and then dried at 85°C to form an anode active material layer, and then perform c...

Embodiment 1 and comparative example 1

[0125] Example 1 involves zone coating the cathode pole piece without zone coating the anode pole piece. The following will specifically describe the preparation method of the cathode sheet in Example 1 and Comparative Example 1:

[0126] The preparation method of the electrode pole piece of embodiment 1:

[0127] (1) Preparation of slurry

[0128] Cathode LiNi 0.8 mn 0.1 co 0.1 o 2 Slurry: the cathode active component LiNi 0.8 mn 0.1 co 0.1 o 2 , conductive carbon black and binder polyvinylidene fluoride PVDF are mixed by 97%: 1.5%: 1.5% by weight, and diluted with an appropriate amount of N-methylpyrrolidone, and then stirred in a vacuum mixer to form a uniform cathode slurry.

[0129] Cathode LiNi 0.8 mn 0.1 co 0.1 o 2 +LiCoO 2 Slurry: the cathode active ingredient (50wt% LiNi 0.8 mn 0.1 co 0.1 o 2 and 50wt% LiCoO 2 ), conductive carbon black and binder polyvinylidene fluoride PVDF are mixed by 97%: 1.5%: 1.5% by weight, and diluted with an appropriate am...

Embodiment 2A-5 and comparative example 2-5

[0145] Example 2A-5 and Comparative Example 2A-5 only involved zone coating on the anode pole piece, but not zone coating on the cathode pole piece. The preparation method of the anode pole piece in Example 2A-5 and Comparative Example 2A-5 will be described in detail below:

[0146] The preparation method of the electrode pole piece of embodiment 2A:

[0147] (1) Preparation of slurry

[0148]The graphite slurry of anode type A graphite (the OI value is 12, and the degree of graphitization is 92%): the positive active ingredient type A graphite, binder styrene-butadiene rubber SBR and dispersant carboxymethyl cellulose CMC are pressed by 97%: 1%: 2% by weight mixed, and diluted with an appropriate amount of distilled water, and then stirred in a vacuum mixer to form a uniform anode slurry.

[0149] Anode B-type graphite (OI value is 19, graphitization degree is 92%) graphite slurry: positive active component B-type graphite (OI value is 19), binding agent styrene-butadiene ...

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Abstract

The application relates to an electrode plate and an electrochemical device comprising the same. The electrode plate has a first region and a second region. The electrode plate comprises a substrate and an electrode active substance applied to at least one surface of the substrate. The charge-discharge thickness difference of the electrode plate in the first region is Delta D1, the charge-discharge thickness difference of the electrode plate in the second region is Delta D2, and Delta D1 is smaller than Delta D2. When the electrode plate of the application is applied to the electrochemical device, the formation of lithium dendrite can be reduced, and the safety of the electrochemical device can be improved.

Description

technical field [0001] The present application relates to the field of energy storage technology, in particular to an electrode pole piece and an electrochemical device including the electrode pole piece. Background technique [0002] With the popularity of consumer electronics products such as notebook computers, mobile phones, handheld game consoles, tablet computers, mobile power supplies and drones, people have increasingly strict requirements on electrochemical devices (eg, batteries). For example, people not only require the battery to be light, but also require the battery to have a high capacity and a long working life. Among many batteries, lithium-ion batteries have occupied a mainstream position in the market due to their outstanding advantages such as high energy density, high safety, low self-discharge, no memory effect, and long working life. [0003] However, until now, the safety of electrochemical devices has not been effectively guaranteed. For example, a...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H01M4/13H01M4/131H01M4/133H01M4/134H01M4/136H01M4/137H01M10/0525H01M10/42
CPCH01M4/131H01M4/133H01M4/134H01M4/386H01M4/525H01M4/587H01M4/625H01M2004/021H01M2004/027H01M2004/028Y02E60/10H01M10/0525
Inventor 王慧鑫黄思林程晟余红明
Owner DONGGUAN POWERAMP TECH LTD
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