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Pole piece, preparation method of pole piece and battery

A technology of pole pieces and tabs, which is applied in electrode manufacturing, battery electrodes, secondary batteries, etc., can solve the problems of easy folding of thin substrates, hidden dangers of battery safety, and folding of tabs, so that it is not easy to fold and improve energy density , reduce the effect of stepping edge angle

Active Publication Date: 2021-11-30
JIANGSU ZENIO NEW ENERGY BATTERY TECH CO LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Although this method improves the energy density of the battery to a certain extent, the manufacturing process of lithium-ion batteries also faces greater challenges after using thin substrates, especially the tabs located in the empty foil area. Due to the low strength and hardness of thin substrates, It is very easy to have the problem of tabs turning over, which brings great safety hazards to the battery
[0004] Therefore, it is necessary to develop a new technical solution to solve the problem that the tabs of thin substrates are easy to fold

Method used

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  • Pole piece, preparation method of pole piece and battery
  • Pole piece, preparation method of pole piece and battery
  • Pole piece, preparation method of pole piece and battery

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preparation example Construction

[0048] 2. The second aspect of the present application provides a method for preparing the pole piece described in the present application, comprising the steps of:

[0049] Take a current collector, the current collector includes a pole piece body area and a tab area, and the tab area includes a connection area and a tab body area, and the tab body area is connected to the pole piece body through the connection area zone connection;

[0050] preparing an active material slurry, coating it on at least one surface of the pole piece main body area, and drying to form an active material layer;

[0051] Prepare a protective coating slurry, apply it on at least one surface of the tab area, and dry to form a protective coating, the protective coating at least partially coats the connection area and / or the tab main body Area;

[0052] Die-cutting the tab area of ​​the current collector to obtain a pole piece main body and a pole piece connected to the pole piece main body.

[0053...

Embodiment 1～6 and comparative example 1

[0076]Carry out the preparation of pole piece according to the following method:

[0077] 1) Preparation of cathode active material slurry:

[0078] Mix the lithium nickel manganese cobalt ternary material (NCM523), the conductive agent SuperP, and the binder polyvinylidene fluoride according to the weight ratio of 97:1.4:1.6, add N-methylpyrrolidone (NMP), under the action of a vacuum mixer Stir until the system is uniform, and obtain a positive electrode active material slurry with a solid content of 72%.

[0079] 2) Preparation of protective coating slurry:

[0080] Dissolve each component (see Table 1 for details) in a solvent, first stir at a rotation speed of 1400rpm and a revolution speed of 25rpm for 3h, and scrape the glue once every 1h during the stirring period; then use a rotation speed of 0rpm and a revolution speed of 10rpm Slowly stir and defoam in vacuum for 1 hour to obtain a protective coating slurry with a solid content of 10-80% and a viscosity of 1000-10...

Embodiment 7～12 and comparative example 2

[0087] Carry out the preparation of pole piece according to the following method:

[0088] 1) Preparation of negative electrode active material slurry:

[0089] Negative electrode active material artificial graphite, conductive agent SuperP, thickener sodium carboxymethylcellulose (CMC), binder styrene-butadiene rubber (SBR) are mixed according to the weight ratio of 96.4:1.5:0.5:1.6, and deionized water is added , under the action of a vacuum mixer, a negative electrode active material slurry with a solid content of 54% was obtained.

[0090] 2) Preparation of protective coating slurry:

[0091] Dissolve each component (see Table 1 for details) in a solvent, first stir at a rotation speed of 1400rpm and a revolution speed of 25rpm for 3h, and scrape the glue once every 1h during the stirring period; then use a rotation speed of 0rpm and a revolution speed of 10rpm Slowly stir and defoam in vacuum for 1 hour to obtain a protective coating slurry with a solid content of 10-80...

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Abstract

The invention belongs to the field of battery technology, and in particular relates to a pole piece, including a pole piece main body, a tab, an active material layer and a protective coating; The sheet main body is connected; the active material layer is disposed on at least one side of the pole piece main body; the protective coating is disposed on at least one side of the tab, and the protective coating at least partially coats the connection area and / or the tab main body area. In addition, the invention also relates to a method for preparing pole pieces and a battery. Compared with the prior art, the invention improves the strength and stiffness of the thin base material in the main body area, effectively solves the problem of easy folding of tabs, and reduces the safety risk of the battery.

Description

technical field [0001] The invention belongs to the technical field of batteries, and in particular relates to a pole piece, a preparation method of the pole piece and a battery. Background technique [0002] Lithium-ion batteries have been receiving great attention in consumer electronics and power products due to their high operating voltage, high energy density, long cycle life, safety and environmental protection. At present, lithium-ion batteries in the field of new energy are developing rapidly, followed by an increasing demand for lithium-ion batteries with high specific energy density. [0003] At present, in order to increase the energy density of lithium-ion batteries, one of the more common and effective methods is to use thinner substrates, including thin copper foil, thin aluminum foil, and thin diaphragms, to reduce the amount of inactive materials in lithium-ion batteries. proportion, so as to achieve the purpose of increasing the energy density of the batter...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): H01M50/534H01M4/04H01M4/13H01M4/139H01M10/0525H01M10/058
CPCH01M4/0404H01M4/0409H01M4/13H01M4/139H01M10/0525H01M10/058Y02E60/10Y02P70/50
Inventor 牛会琴于清江江柯成姜斌龙绘锦
Owner JIANGSU ZENIO NEW ENERGY BATTERY TECH CO LTD
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