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Composite electrolyte, preparation method thereof, and composite electrode sheet and battery comprising same

A composite electrolyte and electrode pole piece technology, which is applied in the manufacture of electrolyte batteries, non-aqueous electrolyte batteries, non-aqueous electrolyte battery electrodes, etc., can solve the problem that the impedance of the electrolyte and the pole piece has not been solved well, and achieve a lower interface Impedance, improve ionic conductivity, and avoid short circuit effects

Active Publication Date: 2021-02-02
SUZHOU QINGTAO NEW ENERGY TECH CO LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0008] However, the above-mentioned impedance problem between the electrolyte and the pole piece has not been well resolved.

Method used

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  • Composite electrolyte, preparation method thereof, and composite electrode sheet and battery comprising same
  • Composite electrolyte, preparation method thereof, and composite electrode sheet and battery comprising same
  • Composite electrolyte, preparation method thereof, and composite electrode sheet and battery comprising same

Examples

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Embodiment 1

[0098] This embodiment provides a composite electrolyte, which includes a composite layer and a polymer layer; the composite layer includes a PVDF-LLZTO porous solid electrolyte layer with a porosity of 80%, an average pore diameter of 15.7 μm, and a thickness of 20 μm, and PMMA-based gel electrolyte filled in the pores of the porous solid electrolyte layer, the pores include interpenetrating pores and pores distributed on the surfaces of both sides of the porous solid electrolyte; the polymer layer is a 18 μm thick PEO-based polymer solid electrolyte layer.

[0099] The preparation method of composite electrolyte described in this embodiment comprises the following steps:

[0100] (1) Preparation of porous layer

[0101] Calculate the porosity and pore-forming dose of the porous layer according to the amount of gel electrolyte added, and the mass parts are 70 parts of LLZTO, 30 parts of PVDF, and 30 parts of LiN(SO 2 CF 3 ) 2 Mix with 25 parts of pore-forming agent ammoni...

Embodiment 2

[0108] This embodiment provides a composite electrolyte, which includes a composite layer and a polymer layer; the composite layer is a PVDF-LLZTO porous solid electrolyte layer with a porosity of 40%, an average pore diameter of 8.4 μm, and a thickness of 25 μm, and PMMA-based gel electrolyte filled in the pores of the porous solid electrolyte layer, the pores include interpenetrating pores and pores distributed on the surfaces of both sides of the porous solid electrolyte; the polymer layer is a 15 μm thick PEO-based polymer solid electrolyte layer.

[0109] The preparation method of the composite electrolyte described in this example is carried out with reference to the method in Example 1.

Embodiment 3

[0111] This embodiment provides a composite electrolyte, which includes a composite layer and a polymer layer; the composite layer is a PVDF-LLZTO porous solid electrolyte layer with a porosity of 60%, an average pore diameter of 12.1 μm, and a thickness of 18 μm, and PMMA-based gel electrolyte filled in the pores of the porous solid electrolyte layer, the pores include interpenetrating pores and pores distributed on the surfaces of both sides of the porous solid electrolyte; the polymer layer is a 10 μm thick PEO-based polymer solid electrolyte layer.

[0112] The preparation method of the composite electrolyte described in this example is carried out with reference to the method in Example 1.

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Abstract

The invention provides a composite electrolyte. The composite electrolyte adopts a porous solid electrolyte layer and fills the pores of the porous solid electrolyte layer with a gel electrolyte, which is beneficial to improve the ionic conductivity and reduce the interface between the electrolyte and the electrode sheet. Impedance, which is applied in the battery, improves the cycle performance and rate performance of the battery.

Description

technical field [0001] The invention relates to the field of battery technology, in particular to a composite electrolyte, a preparation method thereof, a composite electrode sheet and a battery containing the composite electrolyte. Background technique [0002] As a new type of energy storage device, lithium-ion batteries are developing rapidly in the automotive field. Lithium-ion battery electrolytes are roughly divided into liquid electrolytes, gel electrolytes, and solid electrolytes. Liquid electrolytes are flammable and explosive, and have great safety hazards. Therefore, they have Solid-state electrolytes with high safety performance have become the focus of research. Solid-state batteries have many advantages, and their development prospects are worth looking forward to. Among them, the two most obvious advantages are higher energy density and safer operation. [0003] Solid-state batteries will not puncture the separator due to the appearance of lithium dendrites a...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): H01M10/056H01M10/058H01M10/0525H01M10/42H01M4/13
CPCH01M4/13H01M10/0525H01M10/056H01M10/058H01M10/4235H01M2300/0065H01M2300/0094Y02E60/10Y02P70/50
Inventor 李峥何泓材王丹丹冯玉川陈凯杨帆
Owner SUZHOU QINGTAO NEW ENERGY TECH CO LTD