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Solid electrolyte for in-situ protection of metal lithium negative electrode and preparation method of solid electrolyte

A technology of solid electrolyte and metal lithium, which is applied in the direction of solid electrolyte, non-aqueous electrolyte, non-aqueous electrolyte battery, etc., can solve the problems of difficult research on electrode/polymer electrolyte interface, thin and uneven passivation film, etc. Growth of dendrites, strength enhancement, and damage prevention effects

Inactive Publication Date: 2020-11-20
GUIZHOU MEILING POWER SUPPLY CO LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0009] These studies have set off a wave of research on the influence of solid electrolytes on the formation of SEI films. However, compared with the interface behavior of electrodes in liquid electrolytes, it is more difficult to study the electrode / polymer electrolyte interface in detail, because the electrode / polymer The passivation film formed on the electrolyte interface is thin and uneven, very sensitive to air and water, and easy to lose. Therefore, the development of a solid-state electrolyte that protects metal lithium anodes in situ is of great significance for solid-state batteries using metal lithium anodes.

Method used

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  • Solid electrolyte for in-situ protection of metal lithium negative electrode and preparation method of solid electrolyte
  • Solid electrolyte for in-situ protection of metal lithium negative electrode and preparation method of solid electrolyte

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Embodiment 1

[0033] A solid electrolyte for in-situ protection of metal lithium negative electrodes, which is a double-salt solid electrolyte with both negative electrode protective agents and lithium salts;

[0034] Its components include by weight percentage: 5% of negative electrode protective agent, 5% of lithium salt, 10% of additive, 10% of plasticizer, and the balance is polymer base;

[0035] The polymer substrate is PEO;

[0036] The negative electrode protective agent is LiNO 3 ;

[0037] The lithium salt is LiPF 6 ;

[0038] The additive is silica nanoparticles;

[0039] Described plasticizer is succinonitrile;

[0040] The solid electrolyte for in-situ protection of the metal lithium negative electrode is obtained by dissolving the aforementioned negative electrode protective agent, lithium salt, additive, plasticizer, and polymer substrate in a solvent, followed by pouring and secondary drying;

[0041] The solvent is NN'-dimethylformamide, and its consumption is 2.5 times...

Embodiment 2

[0043] A solid electrolyte for in-situ protection of metal lithium negative electrodes, which is a double-salt solid electrolyte with both negative electrode protective agents and lithium salts;

[0044] Its components include by weight percentage: 10% of negative electrode protective agent, 10% of lithium salt, 15% of additive, 15% of plasticizer, and the balance is polymer base;

[0045] The polymer substrate is PEO;

[0046] The negative electrode protection agent is LiBOB;

[0047] The lithium salt is LiBF 4 ;

[0048] The additive is garnet-type nanoparticles;

[0049] Described plasticizer is succinonitrile;

[0050] The solid electrolyte for in-situ protection of the metal lithium negative electrode is obtained by dissolving the aforementioned negative electrode protective agent, lithium salt, additive, plasticizer, and polymer substrate in a solvent, followed by pouring and secondary drying;

[0051] The solvent is NN'-dimethylacetamide, and its consumption is 2 t...

Embodiment 3

[0053] A method for preparing a solid-state electrolyte for in-situ protection of lithium metal negative electrodes, comprising the steps of:

[0054] 1) Mix the polymer substrate, nitrogen-containing lithium nitrate salt, fluorine-containing lithium salt, additives, plasticizer and solvent evenly, and stir at a constant temperature of 55-65°C until the solution is clear and transparent;

[0055] 2) Cast the uniformly mixed solution onto a glass plate, and dry it in a constant temperature oven at 70-90°C to obtain a pre-dried polymer electrolyte film;

[0056] 3) Dry the pre-dried polymer electrolyte film in a vacuum oven at 48-56° C. for ≥ 4 hours.

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Abstract

The invention belongs to the technical field of polymer electrolytes and relates to a solid electrolyte for in-situ protection of a metal lithium negative electrode and a preparation method of the solid electrolyte. The solid electrolyte is a double-salt type solid electrolyte with both a negative electrode protective agent and a lithium salt, can ensure continuous generation of an SEI film on thesurface of a metal lithium negative electrode, inhibits growth of dendrites in the lithium negative electrode, and improves the cycling stability of the metal lithium negative electrode.

Description

technical field [0001] The invention belongs to the technical field of polymer electrolytes, and in particular relates to a solid electrolyte for in-situ protection of metal lithium negative electrodes and a preparation method thereof. Background technique [0002] The development of electric vehicles and intelligent energy storage has promoted the rapid development of high specific energy secondary lithium batteries. Due to its high theoretical energy density and low reduction potential, metal lithium anodes have attracted more and more attention from researchers of high specific energy secondary lithium batteries. Therefore, the secondary lithium battery system using lithium metal negative electrode and high-voltage ternary positive electrode is also the most promising next-generation lithium battery. However, at present, lithium-ion batteries use liquid organic electrolytes, which contain toxic and volatile organic solvents with low ignition points, which will bring safe...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H01M10/0565H01M10/052
CPCH01M10/052H01M10/0565H01M2300/0082Y02E60/10
Inventor 康树森吴宁宁杨程响杨泽林赵珊唐康康陈晓涛刘富亮石斌
Owner GUIZHOU MEILING POWER SUPPLY CO LTD
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