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Lithium ion battery electrode, battery and activation method thereof

A lithium-ion battery and battery electrode technology, applied in battery electrodes, secondary battery charging/discharging, batteries, etc., can solve the problems of product endurance loss, lithium-ion battery performance attenuation acceleration, etc., to reduce the physical transmission distance and improve Low-temperature battery life and the effect of low-temperature discharge performance

Active Publication Date: 2020-06-16
BEIJING XIAOMI MOBILE SOFTWARE CO LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, limited by the lithium-ion battery system, the performance degradation of lithium-ion batteries is accelerated at low temperatures, and the battery life of the product suffers a great loss.

Method used

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  • Lithium ion battery electrode, battery and activation method thereof
  • Lithium ion battery electrode, battery and activation method thereof
  • Lithium ion battery electrode, battery and activation method thereof

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0049] A lithium ion battery electrode, including active material, conductive carbon, binder and current collector.

[0050] In the positive electrode, the weight ratio of active material, conductive carbon and binder is 92:6:2. The active material is lithium cobalt oxide. The binder is PVDF. The current collector is aluminum foil. The conductive carbon includes conductive carbon black with a weight content of 30%, ordinary activated carbon with a weight content of 30%, and activated carbon with a high specific surface area and high, medium and large pores distribution with a weight content of 40%.

[0051]In the negative electrode, the weight ratio of active material, conductive carbon and binder is 97:1:2. The active material is artificial graphite. The binder is SBR. The current collector is copper foil. The conductive carbon includes conductive carbon black with a weight content of 30%, ordinary activated carbon with a weight content of 30%, and activated carbon with...

Embodiment 2

[0054] A lithium ion battery electrode, including active material, conductive carbon, binder and current collector.

[0055] In the positive electrode, the weight ratio of active material, conductive carbon and binder is 92:6:2. The active material is lithium manganate. The binder is PVDF. The current collector is aluminum foil. The conductive carbon includes carbon nanotubes with a weight content of 20%, ordinary activated carbon with a weight content of 30%, and activated carbon with a high specific surface area and a distribution of high, medium and large pores with a weight content of 50%.

[0056] In the negative electrode, the weight ratio of active material, conductive carbon and binder is 97:1:2. The active material is artificial graphite. The binder is SBR. The current collector is copper foil. The conductive carbon includes graphene with a weight content of 20%, ordinary activated carbon with a weight content of 30%, and activated carbon with a high specific su...

Embodiment 3

[0059] A lithium ion battery electrode, including active material, conductive carbon, binder and current collector.

[0060] In the positive electrode, the weight ratio of active material, conductive carbon and binder is 92:6:2. The active material is lithium cobalt oxide. The binder is PVDF. The current collector is aluminum foil. The conductive carbon includes conductive carbon black with a weight content of 30%, ordinary activated carbon with a weight content of 50%, and activated carbon with a high specific surface area and high, medium and large pores distribution with a weight content of 20%.

[0061] In the negative electrode, the weight ratio of active material, conductive carbon and binder is 97:1:2. The active material is artificial graphite. The binder is SBR. The current collector is copper foil. The conductive carbon includes conductive carbon black with a weight content of 30%, ordinary activated carbon with a weight content of 50%, and activated carbon wit...

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Abstract

The invention discloses a lithium ion battery electrode, a battery comprising the electrode and an activation method of the battery. The electrode comprises an active substance, conductive carbon, a binder and a current collector, wherein the conductive carbon comprises activated carbon of which the specific surface area is greater than 1000m<2> / g and the percentage of pore size of 2-50nm is greater than 30%. According to the invention, the positive and negative pole pieces are porous, so that the discharge capacity of the lithium ion battery at low temperature is greatly improved, the low-temperature endurance is improved, and the user experience is greatly improved; an overvoltage initial activation process is provided, the film forming state of an SEI film on the surface of graphite isgreatly improved, and the low-temperature performance of the lithium ion battery is improved.

Description

technical field [0001] The invention relates to the technical field of lithium ion batteries, in particular to a lithium ion battery electrode, a battery and an activation method thereof. Background technique [0002] In recent years, lithium-ion batteries have been more widely used in smart wearables, mobile phones, PCs, electric vehicles, electric vehicles and other fields. In particular, the promotion of electric vehicles has pushed the development of lithium-ion batteries to a new wind direction. However, limited by the lithium-ion battery system, the performance degradation of lithium-ion batteries is accelerated at low temperatures, and the battery life of the product suffers a great loss. Therefore, how to improve the performance of lithium-ion batteries at low temperatures has become an important research topic, especially with the development of electric vehicles in recent years. In terms of improving the low-temperature battery life of lithium-ion batteries, rese...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H01M4/131H01M4/133H01M4/62H01M4/1391H01M4/1393H01M10/42H01M10/44
CPCH01M4/131H01M4/133H01M4/1391H01M4/1393H01M4/625H01M10/4242H01M10/446H01M2004/021H01M2004/028H01M2220/20Y02E60/10
Inventor 杜思红
Owner BEIJING XIAOMI MOBILE SOFTWARE CO LTD