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Composite electrolyte and preparation method thereof, and composite electrode plate and battery containing composite electrolyte

A composite electrolyte, electrode electrode technology, applied in non-aqueous electrolyte batteries, electrolyte battery manufacturing, non-aqueous electrolyte battery electrodes, etc. Impedance, high ionic conductivity, effect of avoiding short circuits

Active Publication Date: 2020-11-13
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 and preparation method thereof, and composite electrode plate and battery containing composite electrolyte
  • Composite electrolyte and preparation method thereof, and composite electrode plate and battery containing composite electrolyte
  • Composite electrolyte and preparation method thereof, and composite electrode plate and battery containing composite electrolyte

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. According to the composite electrolyte, the porous solid electrolyte layer is adopted, and the pores of the porous solid electrolyte layer are filled with the gel electrolyte, so that the ionic conductivity is improved, the interface impedance between the electrolyte and the electrode plate is reduced, and the cycle performance and the rate capability of the battery are improved when the composite electrolyte is applied to 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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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
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