Composite solid electrolyte, flexible all-solid-state battery, preparation method and wearable electronic device

A solid-state electrolyte and all-solid-state battery technology, which can be used in the manufacture of electrolyte batteries, non-aqueous electrolyte batteries, and electrolyte immobilization/gelation. , reduce the internal resistance and increase the effect of the contact interface

Inactive Publication Date: 2017-01-04
TSINGHUA UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0002] At present, commercial lithium-ion batteries mostly use liquid electrolyte as the conduction medium for lithium ions between the positi

Method used

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  • Composite solid electrolyte, flexible all-solid-state battery, preparation method and wearable electronic device
  • Composite solid electrolyte, flexible all-solid-state battery, preparation method and wearable electronic device
  • Composite solid electrolyte, flexible all-solid-state battery, preparation method and wearable electronic device

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0061] In this embodiment, the positive electrode active material adopts nickel-cobalt-manganese ternary material (LiNi 0.5 co 0.2 mn 0.3 o 2 ), the polymer matrix is ​​polyethylene oxide, the lithium salt is lithium ammonium trifluoromethanesulfonate, and the conductive additive is indium oxide. After mixing the four raw materials in acetonitrile at a mass ratio of 5:1:1:3, the room temperature The mixture was stirred for 12 hours to obtain a composite positive electrode slurry. The composite cathode slurry was vacuum-dried at 60°C for 12 hours to obtain a composite cathode precursor powder, and finally the composite cathode precursor powder was pressed under a pressure of 4 MPa to obtain a composite cathode sheet with a thickness of 200 microns.

[0062] The cross-sectional scanning electron microscope figure of the composite positive electrode sheet of this embodiment, as figure 1 shown. Depend on figure 1 It can be seen that the composite positive electrode sheet pre...

Embodiment 2

[0064] In this example, lithium cobaltate is used as the positive electrode active material, chlorohydrin rubber as the polymer matrix, lithium perchlorate is selected as the lithium salt, and indium oxide is used as the conductive additive. The mass ratio of the four raw materials is 2:1:1: 1 was mixed in acetone and stirred at room temperature for 12 hours to obtain a composite positive electrode slurry. The composite positive electrode slurry was directly coated on the aluminum foil, and dried under vacuum at 60° C. for 12 hours to obtain a composite positive electrode sheet with a thickness of 20 μm.

Embodiment 3

[0066] In this example, the positive electrode active material is lithium iron phosphate, the polymer matrix is ​​polyethylene oxide, the lithium salt is lithium hexafluorophosphate, and the conductive additive is conductive graphite. The mass ratio of the four raw materials is 36:1:1:2. After mixing with nitrile, the mixture was stirred at room temperature for 12 hours to obtain a composite positive electrode slurry. The composite positive electrode slurry was vacuum-dried at 60°C for 12 hours to obtain a composite positive electrode precursor powder, and finally the composite positive electrode precursor powder was pressed under a pressure of 6 MPa to obtain a composite positive electrode sheet with a thickness of 1000 microns

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Abstract

The invention provides a composite solid electrolyte and a preparation method thereof, a flexible all-solid-state battery and a preparation method of the flexible all-solid-state battery and a wearable electronic device. The composite solid electrolyte comprises a ceramic-based solid electrolyte and a first polymer-based solid electrolyte, wherein the content of the ceramic-based solid electrolyte is 20-90wt% of total weight of the composite solid electrolyte. The composite solid electrolyte provided by the invention has good mechanical property, high ionic conductivity at a room temperature, good heat stability and electrochemical stability and high safety and can be effectively prevented from being perforated by lithium dendrites, and a good interface contact is formed by the composite solid electrolyte and a composite positive electrode, thereby obtaining the flexible all-solid-state battery which is high in area specific capacity and energy density, relatively small in battery internal resistance and high in flexibility and can be bent and cut and of which use is not affected.

Description

technical field [0001] The present invention relates to the technical field of lithium-ion batteries. Specifically, the present invention relates to a composite solid-state electrolyte and a preparation method thereof, a flexible all-solid-state battery and a preparation method thereof, and wearable electronic devices. Background technique [0002] At present, commercial lithium-ion batteries mostly use liquid electrolyte as the conduction medium for lithium ions between the positive and negative electrodes. Flammability and explosiveness have brought great safety hazards to the large-scale application of lithium-ion batteries. [0003] In view of the above problems, it is the best solution to prepare all-solid-state lithium-ion batteries by using solid electrolytes instead of traditional electrolytes. The all-solid-state lithium-ion battery can prevent safety accidents such as liquid leakage and explosion, and at the same time, it can meet many harsh environmental requirem...

Claims

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Application Information

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IPC IPC(8): H01M10/056H01M10/0525H01M10/058
CPCH01M10/0525H01M10/056H01M10/058H01M2300/0085Y02E60/10Y02P70/50
Inventor 南策文陈儒君张益博刘亭林元华沈洋
Owner TSINGHUA UNIV
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