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Preparation method of lithium ion battery pole piece containing PTC coating

A lithium-ion battery and pole piece technology, applied in electrode manufacturing, battery electrodes, batteries, etc., can solve the problems of battery fire or explosion, high electrochemical reaction activity, etc., achieve reduced transfer speed, good conductivity, and prevent reaction from heating up Effect

Inactive Publication Date: 2015-03-11
SHANGHAI AEROSPACE POWER TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Due to the high electrochemical reactivity of the electrode materials used in lithium-ion batteries, and the electrolyte contains a large amount of flammable organic solvents, the battery is prone to fire or explosion caused by overcharging, short circuit, extrusion, etc. during use.

Method used

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  • Preparation method of lithium ion battery pole piece containing PTC coating

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preparation example Construction

[0022] The preparation method of the lithium-ion battery pole sheet containing PTC coating provided by the present invention, the lithium-ion battery is provided with positive and negative electrode sheets formed by coating a slurry containing positive and negative active materials on the current collector 1, Contains the following steps.

[0023] Step 1, add the binder, positive temperature type material, and conductive agent in the solvent according to the weight percentage of 20%~80%, 10%~80%, 0%~70%, and mix evenly to make a precoat 2 coating ; Precoat 2 coating, wherein the solid content is 5-20% by weight; the solvent is preferably an organic solvent, more preferably N-methylpyrrolidone (NMP); and preferably, the binder and the solvent Mix, then add positive temperature type material and conductive agent respectively and mix evenly to prepare precoat 2 coating with solid content of 10% by weight.

[0024] Step 2, coating the precoat 2 coating obtained in step 1 on the c...

Embodiment 1

[0035] Pre-coating 2 mixture: Weigh the materials according to the ratio of 50% wt%, 45% wt%, and 5% wt% of binder PVDF, polyethylene-based composite conductive polymer material, and conductive carbon black Super P, respectively. First, the binder PVDF was dissolved in the solvent NMP, and then polyethylene-based composite conductive polymer material and conductive carbon black Super P were added respectively, and the pre-coating 2 coating with a solid content of 10% wt% was prepared after mixing evenly.

[0036] The above-mentioned pre-coating 2 paint is coated on the aluminum foil, and dried to form a conductive aluminum foil with temperature characteristics.

[0037]The positive electrode is made of ternary material NCM111, and the negative electrode is made of artificial graphite. The positive and negative electrode slurries are prepared respectively. The prepared positive electrode slurry is coated on the above-mentioned conductive aluminum foil with temperature characteri...

Embodiment 2

[0039] Pre-coat 2 mixture: 50% wt%, 40% wt%, 5% wt%, 5% by binder PFTE, polyethylene-based composite conductive polymer material, conductive carbon black Super P, and conductive graphite Ks-6, respectively The ratio of % wt% is weighed material. Mix the binder PFTE with the solvent NMP, then add polyethylene-based composite conductive polymer material, conductive carbon black Super P, and conductive graphite Ks-6, and mix well to form a pre-coat with a solid content of 10% wt%. 2 paints.

[0040] The above-mentioned pre-coating 2 paint is coated on the aluminum foil, and dried to form a conductive aluminum foil with temperature characteristics.

[0041] The positive electrode is made of lithium iron phosphate material, and the negative electrode is made of artificial graphite. The positive and negative electrode slurries are prepared respectively, and the prepared positive electrode slurry is coated on the above-mentioned conductive aluminum foil with temperature characterist...

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Abstract

The invention discloses a preparation method of a lithium ion battery pole piece containing a PTC (Positive Temperature Coefficient) coating. The pole piece prepared by the method is a multilayer coated pole piece. The method comprises the following steps: before coating slurry comprising an anode or a cathode active substance onto a current collector, coating the current collector with a precoated layer with the temperature sensitivity in advance, wherein the precoated layer with the temperature sensitivity comprises ingredients of a binding agent, a positive temperature material and a conductive agent; the weight ratio of the binding agent to the positive temperature material to the conductive agent is (2-8): (1-8): (0-7). The method provided by the invention is used for preparing the lithium ion battery pole piece containing the PTC coating; the battery using the pole piece has good safety characteristics against overcharge, short circuit, squeezing, needling and the like.

Description

technical field [0001] The invention relates to a preparation method of a pole piece for improving the safety of a lithium ion battery, in particular to a preparation method of a lithium ion battery pole piece containing a PTC coating. Background technique [0002] In recent years, with the depletion of energy and people's requirements for environmental protection, the electric vehicle industry has developed rapidly. Due to its high energy density and long cycle life, lithium-ion batteries have become the preferred power source for electric vehicles. However, as the "power" of power vehicles, the safety of lithium-ion batteries has always been a major obstacle for power vehicles, so the safety of lithium-ion batteries has attracted people's attention. [0003] Lithium-ion batteries are generally composed of a cover plate, a casing, an electrolyte, and a battery cell. The battery cell is assembled by winding or laminating the separator, positive electrode sheet and negative...

Claims

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Application Information

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IPC IPC(8): H01M4/04H01M4/62
CPCH01M4/1391H01M4/1397H01M4/366H01M2200/106Y02E60/10
Inventor 董永峰侯敏刘婵曹辉
Owner SHANGHAI AEROSPACE POWER TECH
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