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Solid electrode and preparation method and application thereof

A technology of solid electrodes and solid electrolytes, applied to solid electrodes and their preparation, applications in solid-state batteries, internal construction of solid electrodes for effective ion transmission and their preparation, can solve the problem of low battery capacity, poor ion conductivity, etc. problems, to achieve the effect of improving ion conduction, high specific capacity, and good rate performance

Pending Publication Date: 2022-04-12
SUZHOU INST OF NANO TECH & NANO BIONICS CHINESE ACEDEMY OF SCI
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

However, because the solid electrolyte material used is composed of regular structure, high molecular weight polymer and inert inorganic filler, its ion conductivity is not good, so the capacity of the battery at 30°C is not high, especially at a high rate of 0.5C. 30mAhg -1

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  • Solid electrode and preparation method and application thereof
  • Solid electrode and preparation method and application thereof
  • Solid electrode and preparation method and application thereof

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preparation example Construction

[0053] Another aspect of the embodiments of the present invention provides a method for preparing the aforementioned solid electrode, which includes:

[0054] Provide a uniform mixed reaction system comprising active material particles, conductive additives, solid electrolyte precursor solution, binder and dispersant, wherein the solid electrolyte precursor solution includes an ionic liquid monomer having at least one reactive active group , a mixture of a polymer monomer having at least one reactive active group, an initiator and a lithium salt;

[0055] Applying the homogeneously mixed reaction system on the current collector, and performing heating or light treatment, so that the ionic liquid monomer and polymer monomer in the homogeneously mixed reaction system undergo in-situ polymerization reaction on the surface of the active material particles , so as to coat the surface of the active material particles to form a polyionic liquid-based solid electrolyte; and,

[0056]...

Embodiment 1

[0082] The composition of the solid electrolyte precursor solution: monomer A: vinylimidazole bistrifluoromethanesulfonimide salt (50wt%), monomer B: acrylate monomer (20wt%), lithium salt: bistrifluoromethanesulfonyl Lithium imide (30 wt%), thermal initiator: azobisisobutyronitrile (1% of the total mass of monomer A and monomer B).

[0083] Preparation of solid electrode: uniformly disperse lithium iron phosphate, conductive agent-conductive carbon black, binder PVDF, and solid electrolyte precursor solution in NMP at a mass ratio of 70:10:10:10, and scrape the dispersion Coated on the surface of aluminum foil with a coating thickness of 200 μm, heated in vacuum at 50°C for 24 hours to polymerize the monomers in the solid electrolyte precursor and remove the solvent NMP at the same time to obtain a solid lithium iron phosphate electrode with a porosity of 3%. The average solid electrolyte contained The molecular weight is about 200,000. The schematic diagram of the internal ...

Embodiment 2

[0085] Solid electrolyte precursor solution composition: monomer A: allyl pyrrole-containing ionic liquid monomer (50wt%), monomer B: acrylate monomer (20wt%), lithium salt: bistrifluoromethanesulfonimide Lithium (30 wt%), thermal initiator: azobisisobutyronitrile (0.5% of the total mass of monomer A and monomer B).

[0086] Preparation of solid electrode: uniformly disperse lithium iron phosphate, conductive agent-conductive carbon black, binder PVDF, and solid electrolyte precursor solution in NMP with a mass ratio of 85:5:0:10, and scrape the dispersion Coated on the surface of aluminum foil with a coating thickness of 200 μm, heated in vacuum at 80°C for 4 hours to polymerize the monomer in the solid electrolyte precursor and remove the solvent NMP at the same time to obtain a solid lithium iron phosphate electrode with a porosity of 5%. The solid electrolyte contained in the average The molecular weight is about 100,000.

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Abstract

The invention discloses a solid electrode and a preparation method and application thereof. The solid electrode comprises active material particles, a conductive additive, a polyion liquid-based solid electrolyte and a current collector, and the conductive additive and the polyion liquid-based solid electrolyte are uniformly and compactly coated on the surfaces of the active material particles. The polyion liquid-based solid electrolyte is a copolymer electrolyte obtained by carrying out in-situ polymerization reaction on an ionic liquid monomer with at least one reactive active group and a polymer monomer with at least one reactive active group. The solid electrode does not contain an ionic liquid plasticizer, various problems caused by the plasticizer are greatly reduced, the solid electrode structure is beneficial to reducing interface impedance among active particles in the solid electrode, ionic conduction among the particles is improved, and the solid electrode has a good application prospect. And the all-solid-state battery containing the solid electrode can obtain higher specific capacity, lower internal resistance and better rate capability at 25 DEG C.

Description

technical field [0001] The invention relates to a solid electrode and a preparation method thereof, in particular to a solid electrode internally constructed for effective ion transmission and a preparation method thereof, as well as its application in solid-state batteries, belonging to the technical field of solid electrodes. Background technique [0002] A solid-state battery is a battery that uses solid electrodes and solid electrolytes. It has the advantages of non-flammability, non-corrosion, non-volatility, and non-leakage. Compared with commercial lithium batteries using organic electrolytes, it has higher safety. In addition, solid-state batteries can achieve lighter weight, smaller volume, better flexibility and higher energy density, etc., and become the ideal target for the power battery of the next generation of new energy vehicles, and also provide more opportunities for military battery products. s Choice. [0003] In solid-state batteries, solid-state electr...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H01M4/62H01M4/66H01M10/0525H01M10/0565
Inventor 许晶晶吴晓东张凤蕊
Owner SUZHOU INST OF NANO TECH & NANO BIONICS CHINESE ACEDEMY OF SCI
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