Solid-state electrolyte, preparation method thereof and solid-state battery

A solid-state electrolyte, solid-state battery technology, applied in non-aqueous electrolyte batteries, electrolyte battery manufacturing, solid electrolytes and other directions, can solve the problem that the electrode plates cannot obtain cycle performance and rate performance, and cannot exert the maximum benefit of solid-state batteries, etc., to improve Insufficient stability, effect of improved ionic conductivity, good mechanical properties

Inactive Publication Date: 2020-12-15
HEFEI GUOXUAN HIGH TECH POWER ENERGY
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  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

To improve the rate performance, the electrode plate is also thinner, and the electrode plate that is too thick cannot obtain good cycle performance and rate performance
The solid-state battery is a solid-solid contact, and the electrode plate developed based on the traditional solid-liquid interface theory is applied to the solid-state battery and cannot maximize the benefits of the solid-state battery.

Method used

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  • Solid-state electrolyte, preparation method thereof and solid-state battery
  • Solid-state electrolyte, preparation method thereof and solid-state battery
  • Solid-state electrolyte, preparation method thereof and solid-state battery

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preparation example Construction

[0032] 1. Preparation of solid electrolyte:

[0033] According to the composition design in Table 2, the base polymer and the dopant were mixed at a mass ratio of 5:1, and then the mixture was placed in an argon atmosphere and heated at 200°C for 24 hours. After cooling, it was ground to reduce the particle size of the material to 50 μm. Left and right, get the polymer ion conductor, spare;

[0034] The ceramic-based ion conductor was put into a ball mill and milled at a speed of 1000 rpm for 8 hours to make the particle size as small as about 500nm. The mixture composed of ceramic-based ion conductor, polymer ion conductor and lithium salt is dissolved in DMF, stirred evenly, and coated on the surface of aluminum foil. After the solvent is volatilized, a solid electrolyte with a thickness of 50 μm is obtained; Table 2 shows the composition and performance parameters of the solid electrolyte. For the lithium salt composition, the mass ratio of LiTFSI and LiDFOB in the lithium...

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Abstract

The invention discloses a solid electrolyte and a preparation method thereof. The solid electrolyte comprises the following components: a ceramic-based ion conductor, a polymer ion conductor and a lithium salt, wherein the polymer ion conductor includes a base polymer and a dopant. The invention also discloses a solid-state battery. The components of the solid electrolyte are improved and optimized, and the ceramic-based ion conductor, the polymer ion conductor and the lithium salt are combined for use, so the ionic conductivity of the solid electrolyte is improved, and the solid electrolyte has relatively small interface impedance and good mechanical properties; in addition, good stability is achieved. By adding a trace amount of electrolyte into the positive electrode plate, the interface contact impedance can be effectively reduced, and meanwhile, the diffusion rate of lithium ions in a solid phase is increased. The prepared solid-state battery is excellent in performance, the maximum working voltage is greater than 4V, the safety performance is good, and the solid-state battery has a very good application prospect.

Description

technical field [0001] The invention belongs to the technical field of lithium-ion batteries, and in particular relates to a solid electrolyte, a preparation method thereof, and a solid-state battery. Background technique [0002] Due to their better safety performance, solid-state batteries are regarded as the next generation of lithium-ion batteries, which will replace liquid lithium-ion batteries in the future, and have the prospect of large-scale application in new energy vehicles. [0003] At present, many problems limit the further application of solid-state batteries. The solid-state electrolyte is the core component of the solid-state battery. The contact interface between the solid-state electrolyte and the plate is a solid-solid interface. Since the interface impedance of the solid-solid interface is extremely large, how to reduce its interface impedance has always been a key issue that needs to be solved. Ceramic-based solid electrolyte is a commonly used solid e...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H01M10/0525H01M10/0562H01M10/0565H01M10/058
CPCH01M10/0525H01M10/0562H01M10/0565H01M10/058H01M2300/0065Y02E60/10Y02P70/50
Inventor 许涛曹勇朱冠楠
Owner HEFEI GUOXUAN HIGH TECH POWER ENERGY
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