Sandwich structure pre-lithiated negative electrode and lithium ion battery

A sandwich and pre-lithiation technology, used in battery electrodes, secondary batteries, structural parts, etc., can solve problems such as reducing the unit energy density of batteries, and achieve the effect of reducing self-discharge behavior, suitable for mass production, and reducing etching.

Active Publication Date: 2020-02-21
复阳固态储能科技(溧阳)有限公司
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, the metal lithium strips used in the contact method pre-lithiation are generally larger than 10 μm, indicating that a large amount of metal lithium does not participate in the reaction, which reduces the actual unit energy density of the battery.

Method used

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  • Sandwich structure pre-lithiated negative electrode and lithium ion battery
  • Sandwich structure pre-lithiated negative electrode and lithium ion battery
  • Sandwich structure pre-lithiated negative electrode and lithium ion battery

Examples

Experimental program
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Effect test

Embodiment 1

[0051] A sandwich structure pre-lithiated negative electrode, comprising a negative electrode current collector, a negative electrode active layer is arranged above the negative electrode current collector, and a sandwich structure is arranged above the negative electrode active layer;

[0052] The sandwich structure includes a primary protection layer, a lithium-containing metal layer, and a secondary protection layer, the lithium-containing metal layer is located between the primary protection layer and the secondary protection layer, and the secondary protection layer is layer is located above the primary protective layer, and the primary protective layer is located on the negative electrode active layer.

[0053] The negative electrode current collector adopts pure copper foil with a thickness of 12 μm, the negative electrode active material is silicon oxide / graphite composite material, the unit capacity is 600mAh / g, and it also contains conductive agent carbon black, CMC, ...

Embodiment 2

[0067] A sandwich structure pre-lithiated negative electrode, comprising a negative electrode current collector, a negative electrode active layer is arranged above the negative electrode current collector, and a sandwich structure is arranged above the negative electrode active layer;

[0068] The sandwich structure includes a primary protection layer, a lithium-containing metal layer, and a secondary protection layer, the lithium-containing metal layer is located between the primary protection layer and the secondary protection layer, and the secondary protection layer is layer is located above the primary protective layer, and the primary protective layer is located on the negative electrode active layer.

[0069] The negative electrode current collector adopts a carbon-coated copper foil with a thickness of 14 μm, and the negative electrode active material is silicon oxide / graphite composite material, and also contains conductive agent carbon black, PVDF, silicon oxide / grap...

Embodiment 3

[0083] A sandwich structure pre-lithiated negative electrode, comprising a negative electrode current collector, a negative electrode active layer is arranged above the negative electrode current collector, and a sandwich structure is arranged above the negative electrode active layer;

[0084] The sandwich structure includes a primary protection layer, a lithium-containing metal layer, and a secondary protection layer, the lithium-containing metal layer is located between the primary protection layer and the secondary protection layer, and the secondary protection layer is layer is located above the primary protective layer, and the primary protective layer is located on the negative electrode active layer.

[0085] The negative electrode current collector adopts a copper foil with a thickness of 12 μm, and the negative electrode active material is a soft carbon material, which also includes conductive agent carbon black, PVDF, soft carbon, conductive agent carbon black, and P...

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Abstract

The invention provides a sandwich structure pre-lithiated negative electrode, which comprises a negative electrode current collector; a negative electrode active layer is arranged above the negative electrode current collector, and a sandwich structure is arranged above the negative electrode active layer; the sandwich structure comprises a first-stage protective layer, a lithium-containing metallayer and a second-stage protective layer; the lithium-containing metal layer is located between the first-stage protective layer and the second-stage protective layer, the second-stage protective layer is located above the first-stage protective layer, and the first-stage protective layer is located on the negative electrode active layer. The sandwich structure pre-lithiation negative electrode can maintain a relatively stable state in the production process and the storage process, the potential safety hazard in the pole piece transfer and battery preparation process is reduced while the electrochemical performance of the battery is improved, the safety performance of the battery is greatly improved, and the negative electrode pre-lithiation effect is greatly improved.

Description

technical field [0001] The invention belongs to the field of lithium ion batteries, and in particular relates to a sandwich structure pre-lithiated negative electrode and a lithium ion battery. Background technique [0002] With the rapid development of electronic products, the demand for lithium-ion batteries with high energy and high power density is increasing year by year. At present, the negative electrode of commercial lithium-ion batteries mainly uses graphite materials, but its theoretical capacity severely limits the overall specific capacity of lithium-ion batteries. It is an inevitable trend to replace graphite with negative electrode materials with higher theoretical capacity. However, currently there are few high specific volume anodes widely used in commercial lithium-ion full batteries. This is mainly because high specific volume anode materials generally have a large initial irreversible capacity, and this part of the capacity needs to be consumed in the cath...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H01M4/131H01M4/133H01M4/134H01M4/136H01M10/0525
CPCH01M4/133H01M4/134H01M4/131H01M4/136H01M10/0525Y02E60/10
Inventor 李立飞
Owner 复阳固态储能科技(溧阳)有限公司
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