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Composite positive plate and lithium ion battery comprising same

A technology of composite positive electrode and positive electrode sheet, applied in secondary batteries, battery electrodes, non-aqueous electrolyte batteries, etc., can solve problems such as safety accidents, internal short-circuit thermal runaway, diaphragm shrinkage, etc., to reduce interface resistance and improve safety performance. , the effect of high ionic conductivity

Pending Publication Date: 2021-11-23
东莞凯德新能源有限公司 +1
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

But at the same time, with the wide application of lithium-ion batteries, there will be some safety accidents. The main reason is that lithium batteries generate a lot of heat during long-term use, which causes the diaphragm to shrink and internal short circuit occurs, causing thermal runaway.

Method used

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  • Composite positive plate and lithium ion battery comprising same
  • Composite positive plate and lithium ion battery comprising same
  • Composite positive plate and lithium ion battery comprising same

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0029] Such as figure 1 As shown, the composite positive electrode sheet includes an aluminum current collector 1 and a positive electrode coating coated on the aluminum current collector 1. The positive electrode coating includes an active material layer 2, a buffer layer 3 and a solid electrolyte layer 4 stacked in sequence. The active material layer 2 Coated on the surface of the aluminum current collector 1.

[0030] The active material layer 2 is composed of 95% positive electrode active material, 3% conductive agent and 2% binder by mass percentage; the solid electrolyte layer 4 is a sulfide coating, which is 98% sulfide and 2% binder by mass percentage Composition: The buffer layer 3 is composed of 95% mass percentage of mixed slurry, 3% conductive agent and 2% binder, and the mixed slurry is composed of positive electrode active material and sulfide. In this embodiment, the conductive agent is Ketjen Black, the binder is PVDF, and the sulfide is Li 10 GeP 2 S 12 , ...

Embodiment 2

[0035] Such as figure 1 As shown, the composite positive electrode sheet includes an aluminum current collector 1 and a positive electrode coating coated on the aluminum current collector 1. The positive electrode coating includes an active material layer 2, a buffer layer 3 and a solid electrolyte layer 4 stacked in sequence. The active material layer 2 Coated on the surface of the aluminum current collector 1.

[0036] The active material layer 2 is composed of 94% positive electrode active material, 4% conductive agent and 2% binder by mass percentage; the solid electrolyte layer 4 is a sulfide coating, which is 97% sulfide and 3% binder by mass percentage Composition: The buffer layer 3 is composed of 94% mixed slurry, 4% conductive agent and 2% binder in mass percentage, and the mixed slurry is composed of positive electrode active material and sulfide. In this embodiment, the conductive agent is Ketjen Black, the binder is PVDF, and the sulfide is Li 10 GeP 2 S 12 , ...

Embodiment 3

[0041] Such as figure 1 As shown, the composite positive electrode sheet includes an aluminum current collector 1 and a positive electrode coating coated on the aluminum current collector 1. The positive electrode coating includes an active material layer 2, a buffer layer 3 and a solid electrolyte layer 4 stacked in sequence. The active material layer 2 Coated on the surface of the aluminum current collector 1.

[0042] The active material layer 2 is composed of 96% positive electrode active material, 2% conductive agent and 2% binder by mass percentage; the solid electrolyte layer 4 is a sulfide coating, which is 99% sulfide and 1% binder by mass percentage Composition: The buffer layer 3 is composed of 96% mass percentage of mixed slurry, 2% conductive agent and 2% binder, and the mixed slurry is composed of positive electrode active material and sulfide. In this embodiment, the conductive agent is Ketjen Black, the binder is PVDF, and the sulfide is Li 10 GeP 2 S 12 , ...

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Abstract

The invention relates to the technical field of lithium ion batteries, in particular to a composite positive plate and a lithium ion battery comprising the positive plate. The composite positive plate comprises an aluminum current collector and a positive coating coated on the aluminum current collector; the positive coating comprises an active material layer, a buffer layer and a solid electrolyte layer which are stacked in sequence, and the active material layer is coated on the surface of the aluminum current collector. The composite positive plate can be used for preparing a lithium ion battery which is free of a diaphragm, high in safety performance and high in ionic conductivity.

Description

technical field [0001] The invention relates to the technical field of lithium ion batteries, in particular to a composite positive electrode sheet and a lithium ion battery including the positive electrode sheet. Background technique [0002] With the explosive development of new energy sources, lithium-ion batteries have been widely used in chemical industry, digital, storage and power. But at the same time, with the wide application of lithium-ion batteries, there will be some safety accidents. The main reason is that lithium batteries generate a lot of heat during long-term use, which causes the diaphragm to shrink and internal short circuit to cause thermal runaway. Contents of the invention [0003] The object of the present invention is to address the deficiencies of the prior art and provide a composite positive electrode sheet, which can be used to prepare a lithium-ion battery without a diaphragm, high in safety performance and high in ion conductivity. [0004]...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H01M10/42H01M10/0562H01M10/058H01M10/0525H01M4/131H01M4/136
CPCH01M10/4235H01M10/0562H01M10/058H01M10/0525H01M4/131H01M4/136Y02P70/50Y02E60/10
Inventor 张志平梁进觉高旭光徐宁侯峰杨波周丹王永月
Owner 东莞凯德新能源有限公司