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Safety coating, electrode plate, preparation method of electrode plate and lithium ion battery

An electrode pole piece, safe technology, applied in the direction of secondary batteries, battery electrodes, battery components, etc., can solve the problems of poor safety performance of lithium-ion batteries, achieve excellent thermal stability, high electrochemical stability, guarantee Safe to use

Pending Publication Date: 2021-10-08
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

[0005] One of the purposes of the present invention is to provide a safety coating to solve the current problem of poor safety performance of lithium-ion batteries affected by thermal runaway. security issues

Method used

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  • Safety coating, electrode plate, preparation method of electrode plate and lithium ion battery
  • Safety coating, electrode plate, preparation method of electrode plate and lithium ion battery
  • Safety coating, electrode plate, preparation method of electrode plate and lithium ion battery

Examples

Experimental program
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Effect test

preparation example Construction

[0043] 3. A method for preparing an electrode pole piece, comprising the following steps:

[0044] Prepare the safety coating slurry, mix and stir the polymer, lithium salt, toughener, inorganic filler and plasticizer to obtain the safety coating slurry; it can be mixed by high-speed dispersion and stirring to obtain a uniform safety coating slurry;

[0045] Prepare pole piece main body;

[0046] Cold pressing; then coating the safety coating slurry on at least one side of the pole piece main body;

[0047] The preparation of the electrode pole piece is completed.

[0048] Further, the preparation method of the pole piece main body is as follows: firstly prepare the active material slurry, then apply the active material slurry on at least one side of the current collector, and dry to obtain the pole piece main body with the active material layer. Wherein, the safety coating slurry is coated on the side of the active material layer away from the current collector and / or on t...

Embodiment 1

[0056] A lithium-ion battery includes a positive electrode sheet, a negative electrode sheet, a diaphragm spaced between the positive electrode sheet and the negative electrode sheet, and an electrolyte; wherein, the safety coating is coated on the negative electrode sheet.

[0057] (1) Preparation of positive electrode sheet

[0058] Mix NCM811 positive electrode active material, conductive agent superconducting carbon and carbon tubes, and binder polyvinylidene fluoride in a mass ratio of 96:2:0.5:1.5 to make positive electrode slurry, and coat the positive electrode slurry on the current collector aluminum foil On one surface of the aluminum foil, after drying and winding at 120°C, the positive electrode slurry is coated and dried on the other side of the aluminum foil according to the above method, and then the prepared aluminum foil is double-sided coated with the positive electrode active material layer. cold pressing;

[0059] Carry out edge trimming, cutting into piec...

Embodiment 2

[0070] The difference from Example 1 is the preparation of the negative electrode sheet.

[0071] Preparation of negative electrode sheet:

[0072] The silicon carbon negative electrode active material, the conductive agent superconducting carbon, the thickener sodium carboxymethyl cellulose, and the binder styrene-butadiene rubber are made into a negative electrode slurry at a mass ratio of 96:1.5:1.0:1.5, and coated on the current collector After the copper foil is dried and rolled at 105°C, the negative electrode slurry is coated and dried on the other side of the copper foil according to the above method, and then the prepared copper foil is coated with a negative electrode active material layer on both sides. cold pressing;

[0073] Preparation of safety coating: polyvinylidene fluoride-hexafluoropropylene, lithium bistrifluoromethanesulfonimide, polyvinyl acetate, lithium lanthanum zirconium tantalum oxide and ethylene carbonate in a ratio of 45:30:15:6: The mass ratio...

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Abstract

The invention provides a safety coating, an electrode plate, a preparation method of the electrode plate and a lithium ion battery. The safety coating comprises a polymer, a lithium salt, a flexibilizer, an inorganic filler and a plasticizer. The safety coating has the characteristics of electronic insulation and lithium ion conduction. Compared with the prior art, the safety coating provided by the invention takes the polymer as a film forming substrate, and then the polymer acts together with the lithium salt, the flexibilizer, the inorganic filler, the plasticizer and other substances, so that the safety coating not only has the characteristics of electronic insulation and lithium ion conduction, but also has good toughness and mechanical strength; and when the plate is punctured or extruded by an external object, the plate can be better protected, and the double isolation effect with the diaphragm is achieved, so that the situation of thermal runaway caused by short circuit of the battery is avoided.

Description

technical field [0001] The invention relates to the field of lithium batteries, in particular to a safety coating, an electrode pole piece, a preparation method thereof, and a lithium ion battery. Background technique [0002] In order to alleviate problems such as environmental pollution and energy crisis, the state has made it clear that it will focus on the development of new energy industries. As a new type of energy, lithium-ion batteries have the advantages of high energy density, large capacity, long cycle life, and no memory effect, and have been widely used in electronic products and electric vehicles. Lithium-ion batteries are an important source of power for various equipment and devices, and their failure or failure will lead to system failures, resulting in huge economic losses, and even catastrophic failures. In recent years, there have been many safety accidents related to lithium-ion batteries, so the safety issues caused by thermal runaway of lithium-ion ba...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H01M4/13H01M4/139H01M10/0525H01M10/42H01M50/46
CPCH01M4/13H01M4/139H01M10/4235H01M50/46H01M10/0525Y02E60/10
Inventor 于清江陈琪康刘娇江柯成张传健姜斌龙绘锦
Owner JIANGSU ZENIO NEW ENERGY BATTERY TECH CO LTD
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