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A kind of preparation method of pole piece containing ptc coating and lithium ion battery

A lithium-ion battery and pole piece technology, which is applied in the field of preparation of PTC-coated pole pieces, can solve the problems of discontinuity, high cost, and influence on the effect of porous ceramic heat-sensitive materials, and achieve good application potential, low cost, The effect of improving compatibility

Active Publication Date: 2022-02-15
ZHUHAI COSMX BATTERY CO LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0004] In order to improve the safety performance of lithium-ion batteries, the Chinese invention patent application with application number CN201410661206.9 discloses a multi-layer PTC coating with binder, positive temperature type materials and conductive agents as materials to improve lithium-ion batteries. safety performance, but the PTC coating in this patent application requires a special processing technology, which is applied to the existing lithium-ion battery manufacturing process, and there are problems such as high cost
The Chinese invention patent application with the application number CN201610446371.1 discloses a PTC coating prepared from porous ceramic heat-sensitive materials, conductive agents, and binders. The PTC coating uses water-based materials to effectively reduce energy consumption and processing costs. , but the porous ceramic heat-sensitive material used in this patent application has discontinuity, which affects its effect

Method used

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Experimental program
Comparison scheme
Effect test

specific Embodiment approach 1

[0028] A preparation method containing a PTC-coated pole piece, comprising the following steps:

[0029]Step 1: In parts by weight, stir 400-1000 parts of solvent, 50-100 parts of high molecular polymer, and 0.5-3 parts of conductive agent at a speed of 100-3000 r / min until the materials are evenly dispersed, and then add 0.1-5 parts of a mixed reagent of a high-voltage resistant cross-linking agent and an initiator, wherein the mass fraction of the initiator in the high-voltage-resistant cross-linking agent is 0.1% to 2%, stirred at a speed of 100 to 1000r / min for 2 to 8 hours , to obtain the coating slurry;

[0030] Step 2: Coating the coating slurry on the current collector by spraying or gravure printing with a coating machine, and drying at 80-120°C for 2-6 hours to obtain a current collector coated with a PTC coating, wherein The thickness of PTC coating is 0.1um~10um;

[0031] Step 3: uniformly coating the pole piece slurry on the current collector coated with the PTC...

specific Embodiment approach 2

[0046] A preparation method containing a PTC-coated pole piece, comprising the following steps:

[0047] Step 1: In parts by weight, stir 400-1000 parts of solvent, 50-100 parts of high molecular polymer, and 0.5-3 parts of conductive agent at a speed of 100-3000 r / min until the materials are evenly dispersed, and then add 0.1-5 parts of a mixed reagent of a high-voltage resistant cross-linking agent and an initiator, wherein the mass fraction of the initiator in the high-voltage-resistant cross-linking agent is 0.1% to 2%, stirred at a speed of 100 to 1000r / min for 2 to 8 hours , to obtain the coating slurry;

[0048] Step 2: Coating the coating slurry on the current collector by spraying or gravure printing with a coating machine, and drying at 80-120°C for 2-6 hours to obtain a current collector coated with a PTC coating, wherein The thickness of PTC coating is 0.1um~10um;

[0049] Step 3: uniformly coating the pole piece slurry on the current collector coated with the PT...

specific Embodiment approach 3

[0064] A preparation method containing a PTC-coated pole piece, comprising the following steps:

[0065] Step 1: In parts by weight, stir 400-1000 parts of solvent, 50-100 parts of high molecular polymer, and 0.5-3 parts of conductive agent at a speed of 100-3000 r / min until the materials are evenly dispersed, and then add 0.1-5 parts of a mixed reagent of a high-voltage resistant cross-linking agent and an initiator, wherein the mass fraction of the initiator in the high-voltage-resistant cross-linking agent is 0.1% to 2%, stirred at a speed of 100 to 1000r / min for 2 to 8 hours , to obtain the coating slurry;

[0066] Step 2: Coating the coating slurry on the current collector by spraying or gravure printing with a coating machine, and drying at 80-120°C for 2-6 hours to obtain a current collector coated with a PTC coating, wherein The thickness of PTC coating is 0.1um~10um;

[0067] Step 3: uniformly coating the pole piece slurry on the current collector coated with the PT...

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Abstract

The invention provides a preparation method of a pole piece containing a PTC coating and a lithium ion battery containing the pole piece, belonging to the technical field of lithium ion batteries, comprising the following steps, step 1: by weight parts, adding 400 to 1000 parts of solvent , 50-100 parts of high molecular polymer, 0.5-3 parts of conductive agent, after stirring evenly, add 0.1-5 parts of the mixed reagent of high-voltage resistant cross-linking agent and initiator, wherein the initiator accounts for the proportion of high-voltage-resistant cross-linking agent The mass fraction is 0.1-2%, stirring for 2-8 hours to obtain the coating slurry; Step 2: coating the coating slurry on the current collector, drying at 80-120°C for 2-6 hours, and obtaining the coated PTC The current collector of the coating; step 3: uniformly coat the pole piece slurry on the current collector, dry, roll, and slice to obtain a lithium ion battery pole piece containing a PTC coating. The present invention adopts a molecular design method and introduces High voltage resistant cross-linking structure system, effectively improving the compatibility and processing performance of PTC coating and pole piece.

Description

technical field [0001] The invention belongs to the technical field of lithium ion batteries, and in particular relates to a preparation method of a pole piece containing a PTC coating and a lithium ion battery. Background technique [0002] Lithium-ion batteries have the characteristics of long service life and high energy density, and have been widely used at present. At present, the main problem that restricts the application of lithium-ion batteries is the problem of poor safety. Since the current mainstream lithium-ion battery products use organic liquid electrolytes, there are safety problems such as electrolyte leakage, fire, and explosion during use, and various safety accidents occur frequently. In order to improve the safety performance of lithium-ion batteries, technologies such as special separators and positive temperature coefficient materials (Positive Temperature Coefficient, PTC) are mainly used. Among them, special separators cannot block thermal side react...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): H01M50/581H01M4/04H01M4/139H01M4/62H01M10/0525H01M10/058
CPCH01M4/0404H01M4/0471H01M4/139H01M4/62H01M10/0525H01M10/058H01M50/581Y02E60/10Y02P70/50
Inventor 唐伟超李素丽赵伟袁号李俊义徐延铭
Owner ZHUHAI COSMX BATTERY CO LTD