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Current collector containing PTC coatings, and lithium ion battery containing current collector

A current collector and coating technology, applied in batteries, battery electrodes, secondary batteries, etc., can solve the problems of limited improvement effect, inability to block heat-producing side reactions, and inability to be widely used, and achieve normal temperature performance without affecting and reducing Current, the effect of improving needle stick resistance

Active Publication Date: 2018-09-07
WANXIANG 123 CO LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

[0004] For example, Chinese Patent Publication No. CN104269509A, the patent publication date is January 7, 2015, discloses a ceramic coating diaphragm for lithium batteries and a preparation method thereof, which includes a ceramic coating and a substrate diaphragm, and the ceramic coating is composed of a water-based ceramic coating The coating slurry is evenly coated on the surface of the substrate diaphragm, and the ceramic coating slurry includes 10-30wt% of alumina, 0.5-3wt% of adhesive, 0.2-1.0wt% of additives and 0.01-0.1wt% % additives, alumina is a nano-alumina powder with a particle size ratio D1 / D2 of 0.10 to 0.20; the ceramic coating diaphragm of the technical solution of the present invention has improved thermal safety and strong wettability to the electrolyte, and is applied in Lithium batteries can improve the cycle life of the battery; however, the ceramic-coated diaphragm can only improve the thermal stability of the diaphragm, and cannot block the heat-generating side reaction, so the improvement effect is limited. At present, it can only solve the problem that the energy density does not exceed 200Wh / kg. Battery safety issues, not widely available

Method used

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  • Current collector containing PTC coatings, and lithium ion battery containing current collector

Examples

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Effect test

Embodiment 1

[0030] A current collector containing a PTC coating, including a current collector, the front and back of the current collector are provided with a PTC coating, the thickness of the PTC coating is 1 μm, and the PTC coating is coated on the current collector by PTC slurry and dried After making; the viscosity of PTC slurry is 100mPa s, and it is made by the raw material of following parts by weight: 1 part of polymer powder, 1 part of conductive agent, 1 part of inorganic micropowder, 30 parts of solvent; The polymer powder is Polyethylene and polymer powder are baked at 80°C before pulping; the conductive agent is carbon black; the inorganic micropowder is barium titanate; the solvent is chloroform.

[0031] A lithium ion battery, the current collector of the positive electrode sheet or / and negative electrode sheet adopts the above-mentioned current collector containing PTC coating.

Embodiment 2

[0033] A current collector containing a PTC coating, including a current collector, the front and back of the current collector are provided with a PTC coating, the thickness of the PTC coating is 3 μm, and the PTC coating is coated on the current collector by PTC slurry and dried After making; the viscosity of PTC slurry is 1000mPa s, and it is made by the raw material of following parts by weight: polymer powder 1 part, conductive agent 5 parts, inorganic micropowder 2 parts, solvent 300 parts; Macromolecule powder is Polyvinyl chloride, polymer powder is baked at 90°C before pulping; the conductive agent is vapor-deposited carbon fiber; the inorganic powder is strontium-doped barium titanate BaTi 0.95 Sr 0.05 o 3 ; The solvent is chloroform.

[0034] A lithium ion battery, the current collector of the positive electrode sheet or / and negative electrode sheet adopts the above-mentioned current collector containing PTC coating.

Embodiment 3

[0036] A current collector containing a PTC coating, including a current collector, the front and back of the current collector are provided with a PTC coating, the thickness of the PTC coating is 5 μm, and the PTC coating is coated on the current collector by PTC slurry and dried After making; the viscosity of PTC slurry is 1500mPa·s, and it is made by the raw material of following parts by weight: 1 part of polymer powder, 10 parts of conductive agent, 10 parts of inorganic micropowder, 500 parts of solvent; Polypropylene, polyvinylidene fluoride and polymethyl methacrylate are mixed in a weight ratio of 1:1.2:0.9, and the polymer powder is baked at 110°C before pulping; the conductive agent is carbon nanotubes and titanium monoxide Weight ratio 1:1.2 composition; inorganic powder is niobium doped barium titanate BaTi 0.9 Nb 0.1 o 3; The solvent is N-methylpyrrolidone.

[0037] A lithium ion battery, the current collector of the positive electrode sheet or / and negative el...

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Abstract

The invention belongs to the technical field of lithium ion batteries, and discloses a current collector containing PTC coatings, wherein the front surface and the back surface of the current collector are respectively provided with the PTC coating, the thickness of the PTC coating is 1-10 [mu]m, a current collector is coated with a PTC slurry and drying is performed to prepare the PTC coating, the viscosity of the PTC slurry is 100-3500 mPa.s, and the PTC slurry is prepared from polymer powder, an electric-conduction agent, inorganic micro-powder, a solvent and other raw materials. The invention further discloses a lithium ion battery containing the current collector. According to the present invention, with the current collector, the safety performance of the lithium ion battery during the use can be improved, and particularly the nail penetration resistance of the lithium ion battery can be improved; and the normal temperature performance of the lithium ion battery cannot be affected.

Description

technical field [0001] The invention relates to the technical field of lithium ion batteries, in particular to a current collector containing a PTC coating and a lithium ion battery containing the current collector. Background technique [0002] In recent years, the rapid development of portable electronic products, electric vehicles, energy storage power stations and other fields has put forward higher requirements for energy storage technology. Lithium-ion batteries are the first choice in these fields due to their high energy density, and their energy density is getting higher. As the energy density of lithium-ion batteries is getting higher and higher, the safety problems it faces are becoming more and more severe, which has severely limited the terminal use of high-energy-density lithium-ion batteries. The safety problem of lithium-ion batteries is mainly due to the thermal runaway of batteries. Due to the abnormal heat generation reaction inside the battery, the inte...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H01M4/66H01M10/0525
CPCH01M4/663H01M4/664H01M4/667H01M4/668H01M10/0525H01M2200/00H01M2200/106Y02E60/10
Inventor 陈其国沈书敏陈瑶
Owner WANXIANG 123 CO LTD
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