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Current collector, current collector manufacturing method, electrode plate and lithium ion battery

A technology of electrode pole piece and manufacturing method, applied in the direction of electrode carrier/current collector, non-aqueous electrolyte storage battery, secondary battery, etc. The effect of thermal runaway

Active Publication Date: 2019-05-21
CONTEMPORARY AMPEREX TECH CO
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0003] However, the above-mentioned technical scheme of setting an undercoat layer between the current collector and the active material layer only reduces the probability of internal short circuit of the lithium-ion battery caused by extrusion, impact, or piercing by sharp objects, and there is still a problem that causes the battery to heat up. out of control risk

Method used

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  • Current collector, current collector manufacturing method, electrode plate and lithium ion battery
  • Current collector, current collector manufacturing method, electrode plate and lithium ion battery
  • Current collector, current collector manufacturing method, electrode plate and lithium ion battery

Examples

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Effect test

Embodiment 1

[0067] Hard shell batteries, the cathode pole piece adopts figure 1 The current collector shown has a width of 80mm, the width of the first region, that is, the oxidation region, is 35mm, and the surface resistance of the aluminum foil is 3Ω·cm 2 , the thickness of the undercoat layer is 6 μm.

Embodiment 2

[0069] On the basis of Example 1, the width of the first area on the surface of the aluminum foil, ie, the oxidized area, was adjusted from 35 mm to 45 mm, and the widths of the two second areas, ie, the two non-oxidized areas, were correspondingly reduced by 5 mm. Other manufacturing specifications are consistent with embodiment 1.

Embodiment 3

[0071]On the basis of Example 1, increase the degree of oxidation of the first region on the surface of the aluminum foil, that is, the oxidation degree of the oxidized region, and make the surface resistance of the aluminum foil from 3 Ω cm 2 Increased to 10Ω·cm 2 . Other manufacturing specifications are consistent with embodiment 1.

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Abstract

The invention relates to a current collector, a current collector manufacturing method, an electrode plate and a lithium ion battery. The current collector comprises a metal foil and a bottom coatinglayer, wherein the metal foil comprises two surfaces opposite to each other, at least one of the two surfaces is provided with an oxide region, the area of the oxide region accounts for 20-60% of thetotal area of the two surfaces, the surface resistance of the metal foil is (3-10) ohms / cm<2>, and the bottom coating layer is formed on the metal foil. With the current collector, the current collector manufacturing method, the electrode plate and the lithium ion battery, provided by the invention, the thermal runaway of a battery cell can be effectively and stably prevented, the safety of the lithium ion battery is improved, and meanwhile, the current collector is compatible with favorable electrical performance.

Description

technical field [0001] The invention belongs to the technical field of batteries, and in particular relates to a current collector, a method for manufacturing the current collector, electrode pole pieces and a lithium ion battery. Background technique [0002] With the widespread application of lithium-ion batteries, their safety performance is one of the properties that consumers are very concerned about, and it is also a very difficult problem to solve. At present, the new technology adopted in the safety performance of lithium-ion batteries is to use undercoating to protect the current collector, and at the same time, it can increase the short-circuit resistance, reduce the short-circuit power, and suppress thermal runaway, thereby improving the safety performance of lithium-ion batteries. [0003] However, the above-mentioned technical scheme of setting an undercoat layer between the current collector and the active material layer only reduces the probability of internal...

Claims

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Application Information

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IPC IPC(8): H01M4/13H01M4/139H01M4/66H01M10/0525H01M10/058
CPCY02E60/10Y02P70/50
Inventor 林明翔龙熙桂张小细
Owner CONTEMPORARY AMPEREX TECH CO
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