A kind of preparation method of lithium-ion battery pole piece containing PTC coating

Abstract

The invention discloses a preparation method of a lithium ion battery electrode piece containing a PTC coating layer. The method is characterized in that the method comprises the following steps: mixing a positive active material or a negative active material of the lithium ion battery with a conductive agent and a binder according to a certain ratio; performing stirring to obtain positive electrode slurry or negative electrode slurry; mixing the stirred slurry with sol; before the mixed slurry is coated on a current collector, performing the pre-coating of ceramic PTC coating slurry; performing drying to prepare a battery electrode piece after coating is completed, wherein the ceramic PTC coating layer is composed of barium titanate, titanium dioxide, tantalum pentoxide, lanthanum oxide,lead tetraoxide, calcium carbonate and manganese oxide. According to the invention, a heating source is made by using the temperature resistance characteristic, and can also play a role in overheatingprotection of the battery as a heating element.

Description

technical field

[0001] The invention relates to the technical field of preparation of lithium battery components, 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, lithium-ion batteries have become the first choice of power energy due to their high energy density and long cycle life. However, the safety issue of lithium-ion batteries has always been a major obstacle, so the safety issue of lithium-ion batteries has attracted people's attention. Contents of the invention

[0003] In order to solve the above-mentioned deficiencies in the prior art, the present invention proposes a preparation method of a lithium-ion battery pole piece containing a PTC coating.

[0004] In order to solve the above-mentioned technical problems, the present invention adopts the following technical solutions; a prep...

Examples

Embodiment 1

[0022] A kind of preparation method of the lithium-ion battery pole piece that the present invention proposes containing PTC coating comprises steps: the cathode active material of lithium-ion battery or negative electrode active material and conductive agent (conductive agent is conductive carbon black), bonding Agents (the ingredients on the market can be synthetic resins) are mixed in a weight ratio of 3:1:1, and the positive electrode slurry or negative electrode slurry is obtained after stirring, and the stirred slurry and sol are mixed in a weight ratio of 4:1, The mixed slurry is sprayed on the surface of the ceramic PTC coating by a spray coating machine. The raw materials of the ceramic PTC coating are 70 parts of barium titanate, 3 parts of titanium dioxide, 5 parts of tantalum pentoxide, 2 parts of lanthanum oxide, tetraoxide 3 parts of lead, 3 parts of calcium carbonate, 2 parts of manganese oxide, raw materials and deionized water are mixed and stirred to prepare c...

Embodiment 2

[0025] Further optimization on the basis of Example 1, the raw material of the ceramic PTC coating consists of 85 parts of barium titanate, 8 parts of titanium dioxide, 10 parts of tantalum pentoxide, 4 parts of lanthanum oxide, 3 parts of trilead tetraoxide, and 5 parts of calcium carbonate , composed of 4 parts of manganese oxide, mixed and stirred with deionized water in a total weight ratio of 1:1. After the stirring is completed and coated on the surface of the current collector, the heating rate is 200°C / hour, and the temperature is raised to 1250°C and then kept for 1 hour. The cooling rate The temperature is 250°C / hour, and the temperature is lowered to normal temperature to obtain a ceramic PTC coating, and then all the slurry is sprayed on the ceramic PTC coating, and finally dried to form a battery pole piece.

Embodiment 3

[0027] Changes are made on the basis of Example 1. The raw materials of the ceramic PTC coating are composed of 85 parts of barium titanate, 8 parts of titanium dioxide, 3 parts of tantalum pentoxide, 3 parts of trilead oxide, 5 parts of calcium carbonate, and 4 parts of manganese oxide. , mixed and stirred with deionized water at a total weight ratio of 1:1. After the stirring is completed and coated on the surface of the current collector, the heating rate is 200 ° C / hour, and the temperature is raised to 1250 ° C. After 1 hour, the cooling rate is 250 ° C °C / hour, lower the temperature to normal temperature to prepare a ceramic PTC coating, then spray all the slurry on the ceramic PTC coating, and finally dry it to make a battery pole piece.

technical field

[0001] The invention relates to the technical field of preparation of lithium battery components, 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, lithium-ion batteries have become the first choice of power energy due to their high energy density and long cycle life. However, the safety issue of lithium-ion batteries has always been a major obstacle, so the safety issue of lithium-ion batteries has attracted people's attention. Contents of the invention

[0003] In order to solve the above-mentioned deficiencies in the prior art, the present invention proposes a preparation method of a lithium-ion battery pole piece containing a PTC coating.

[0004] In order to solve the above-mentioned technical problems, the present invention adopts the following technical solutions; a prep...

Examples

Embodiment 1

[0022] A kind of preparation method of the lithium-ion battery pole piece that the present invention proposes containing PTC coating comprises steps: the cathode active material of lithium-ion battery or negative electrode active material and conductive agent (conductive agent is conductive carbon black), bonding Agents (the ingredients on the market can be synthetic resins) are mixed in a weight ratio of 3:1:1, and the positive electrode slurry or negative electrode slurry is obtained after stirring, and the stirred slurry and sol are mixed in a weight ratio of 4:1, The mixed slurry is sprayed on the surface of the ceramic PTC coating by a spray coating machine. The raw materials of the ceramic PTC coating are 70 parts of barium titanate, 3 parts of titanium dioxide, 5 parts of tantalum pentoxide, 2 parts of lanthanum oxide, tetraoxide 3 parts of lead, 3 parts of calcium carbonate, 2 parts of manganese oxide, raw materials and deionized water are mixed and stirred to prepare c...

Embodiment 2

[0025] Further optimization on the basis of Example 1, the raw material of the ceramic PTC coating consists of 85 parts of barium titanate, 8 parts of titanium dioxide, 10 parts of tantalum pentoxide, 4 parts of lanthanum oxide, 3 parts of trilead tetraoxide, and 5 parts of calcium carbonate , composed of 4 parts of manganese oxide, mixed and stirred with deionized water in a total weight ratio of 1:1. After the stirring is completed and coated on the surface of the current collector, the heating rate is 200°C / hour, and the temperature is raised to 1250°C and then kept for 1 hour. The cooling rate The temperature is 250°C / hour, and the temperature is lowered to normal temperature to obtain a ceramic PTC coating, and then all the slurry is sprayed on the ceramic PTC coating, and finally dried to form a battery pole piece.

Embodiment 3

[0027] Changes are made on the basis of Example 1. The raw materials of the ceramic PTC coating are composed of 85 parts of barium titanate, 8 parts of titanium dioxide, 3 parts of tantalum pentoxide, 3 parts of trilead oxide, 5 parts of calcium carbonate, and 4 parts of manganese oxide. , mixed and stirred with deionized water at a total weight ratio of 1:1. After the stirring is completed and coated on the surface of the current collector, the heating rate is 200 ° C / hour, and the temperature is raised to 1250 ° C. After 1 hour, the cooling rate is 250 ° C °C / hour, lower the temperature to normal temperature to prepare a ceramic PTC coating, then spray all the slurry on the ceramic PTC coating, and finally dry it to make a battery pole piece.

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