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Composite solid electrolyte and preparation method and application thereof

A solid electrolyte, mass fraction technology, applied in the manufacture of electrolyte batteries, electrolytes, non-aqueous electrolyte batteries, etc., can solve the problems of high voltage intolerance and low room temperature conductivity, and achieve the advantages of inhibiting migration, high conductivity, and improving cycle life. Effect

Active Publication Date: 2022-03-25
东莞维科电池有限公司 +1
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

The main problem of the current inorganic / organic composite solid electrolyte is the low room temperature conductivity (10 -5 mS / cm, while the conductivity of liquid electrolyte at room temperature> 10 -3 mS / cm), and are not resistant to high pressure, so it is urgent to provide a solid electrolyte with relatively high room temperature conductivity and high pressure resistance

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  • Composite solid electrolyte and preparation method and application thereof
  • Composite solid electrolyte and preparation method and application thereof
  • Composite solid electrolyte and preparation method and application thereof

Examples

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Effect test

Embodiment 1

[0044] A kind of composite solid electrolyte, composition is block polymer, inorganic solid electrolyte, lithium salt and additive; The mass fraction that block polymer accounts for composite solid electrolyte is 81%; The mass fraction that described inorganic solid electrolyte accounts for composite solid electrolyte is 7%; the mass fraction of the lithium salt in the composite solid electrolyte is 11%; the mass fraction of the additive in the composite solid electrolyte is 1%; wherein the block polymer is polyvinylpyridine-polyoxyethylene diblock polymer ; The inorganic solid electrolyte is LLZTO; the lithium salt is LiTSFI; the additive is SN.

[0045] The structural formula of polyvinylpyridine-polyoxyethylene diblock polymer is as follows:

[0046]

[0047] The preparation method of the composite solid electrolyte is:

[0048] Step 1: Dissolve the block polymer and LiTFSI in the solvent acetone in the glove box, stir for 24 hours, then add SN and LLZTO powders respect...

Embodiment 2

[0053] A kind of composite solid electrolyte, composition is block polymer, inorganic solid electrolyte, lithium salt and additive; The mass fraction that block polymer accounts for composite solid electrolyte is 81%; The mass fraction that described inorganic solid electrolyte accounts for composite solid electrolyte is 7%; the mass fraction of the lithium salt in the composite solid electrolyte is 11%; the mass fraction of the additive in the composite solid electrolyte is 1%; wherein the block polymer is polyvinylpyridine-polyoxyethylene diblock polymer ; The inorganic solid electrolyte is LLZTO; the lithium salt is LiBOB; the additive is SN.

[0054] The preparation method of the composite solid electrolyte is:

[0055] Step 1: Dissolve the block polymer and LiBOB in acetone in a glove box, stir for 24 hours, then add SN and LLZTO powders respectively, stir at room temperature for 24 hours and mix evenly to obtain a slurry;

[0056] Step 2: Pour the slurry into a polytetr...

Embodiment 3

[0059] A kind of composite solid electrolyte, composition is block polymer, inorganic solid electrolyte, lithium salt and additive; The mass fraction that block polymer accounts for composite solid electrolyte is 81%; The mass fraction that described inorganic solid electrolyte accounts for composite solid electrolyte is 7%; the mass fraction of the lithium salt in the composite solid electrolyte is 11%; the mass fraction of the additive in the composite solid electrolyte is 1%; wherein the block polymer is polyvinylpyridine-polyoxyethylene diblock polymer ; The inorganic solid electrolyte is LLZTO; the lithium salt is LiTSFI; the additive is SN.

[0060] The preparation method of the composite solid electrolyte is:

[0061] Step 1: Dissolve the block polymer and LiTFSI in acetone in a glove box, stir for 24 hours, then add SN and LLZTO powders respectively, stir at room temperature for 24 hours and mix evenly to obtain a slurry;

[0062] Step 2: Pour the slurry into a polyte...

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Abstract

The invention relates to the technical field of lithium batteries, in particular to a composite solid electrolyte and a preparation method and application thereof. The composite solid electrolyte comprises a block polymer, an inorganic solid electrolyte, a lithium salt and an additive, the block polymer is a polyvinyl pyridine-polyoxyethylene diblock polymer. The composite solid electrolyte provided by the invention contains the polyvinylpyridine-polyoxyethylene diblock polymer, polyvinylpyridine can be used as a matrix, polyoxyethylene chain segments form a vertical cylindrical structure to be dispersed in the polyethylene matrix, a lithium ion transmission channel is formed, and the conductivity of the composite solid electrolyte is greatly improved. The composite solid electrolyte disclosed by the invention is used for preparing a high-voltage battery, can be matched with a lithium cobalt oxide positive electrode and a lithium metal negative electrode to work under a relatively wide voltage, has relatively high room-temperature conductivity and lithium ion transference number, can effectively inhibit cobalt ions dissolved out from the positive electrode from depositing on the lithium metal negative electrode, and prolongs the cycle life of the battery.

Description

technical field [0001] The invention relates to the technical field of lithium batteries, in particular to a composite solid electrolyte and its preparation method and application. Background technique [0002] Lithium batteries have been widely used in civilian and military fields since their commercialization. With the large-scale application of 5G technology and the continuous improvement of consumers' requirements for the portable performance of lithium battery equipment, the market demand for lithium battery energy density and safety is also growing. Traditional lithium batteries use organic solvents as the main liquid electrolyte, which has serious safety problems. Compared with organic electrolytes, solid electrolytes have the advantages of relatively high mechanical strength, good electrochemical stability, and good environmental tolerance, which can well solve the safety problems of liquid electrolytes. Therefore, whether in academia or industry, solid-state elect...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H01M10/0562H01M10/0565H01M10/058H01M10/0525
CPCH01M10/0562H01M10/0565H01M10/058H01M10/0525H01M2300/0091Y02P70/50Y02E60/10
Inventor 向导
Owner 东莞维科电池有限公司
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