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Solid electrolyte, preparation method of solid electrolyte, lithium ion battery and preparation method of lithium ion battery

A solid-state electrolyte and lithium-ion battery technology, which is applied in the manufacture of electrolyte batteries, non-aqueous electrolyte batteries, secondary batteries, etc., can solve the problems of insufficient lithium ion migration number and limit the development of polymer solid electrolytes, and achieve high migration number, Improved transport kinetics, cheap and readily available raw materials

Active Publication Date: 2022-04-08
HUAZHONG UNIV OF SCI & TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Although the above work has improved the ionic conductivity of polymer solid electrolytes to a certain extent, its lithium ion transfer number is still insufficient (<0.7), which limits the further development of polymer solid electrolytes.

Method used

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  • Solid electrolyte, preparation method of solid electrolyte, lithium ion battery and preparation method of lithium ion battery
  • Solid electrolyte, preparation method of solid electrolyte, lithium ion battery and preparation method of lithium ion battery
  • Solid electrolyte, preparation method of solid electrolyte, lithium ion battery and preparation method of lithium ion battery

Examples

Experimental program
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Effect test

Embodiment 1

[0035] Under the condition of water and oxygen concentration less than 1ppm, dissolve lithium bistrifluoromethanesulfonate in 1,3-dioxolane at a molar concentration of 2mol / L, and then add 0.5% iodine and 2% ethyl Glycol dimethyl ether was stirred until it was completely dissolved to obtain a precursor liquid. The precursor solution was left standing at 25°C for 24h to obtain a polymer solid electrolyte (see figure 1 ), the ion conductivity at room temperature is 0.9mS / cm, and the transfer number is 0.85; the precursor solution is injected into the button battery or pouch battery assembled according to the positive electrode layer, diaphragm, and negative electrode layer, and static at 25°C Standing for 24 hours, a battery containing the polymer solid electrolyte was obtained.

Embodiment 2

[0037] Under the condition of water and oxygen concentration less than 1ppm, dissolve lithium bistrifluoromethanesulfonate at a molar concentration of 0.1mol / L in 1,4-epoxybutane, then add 0.1% iodine bromide by mass fraction, and stir until completely dissolved to obtain the precursor fluid. Put the precursor liquid at 0°C for 72 hours to obtain a polymer solid electrolyte with an ionic conductivity of 0.5mS / cm and a migration number of 0.76 at room temperature; inject the precursor liquid into the positive electrode layer, diaphragm, and negative electrode layer to assemble In the button battery or pouch battery, stand at 0°C for 72h to obtain a battery containing the polymer solid electrolyte.

Embodiment 3

[0039] Under the condition of water and oxygen concentration less than 1ppm, add lithium bistrifluoromethanesulfonate at a molar concentration of 6mol / L to 1,3-dioxolane, add 6% iodine trichloride by mass fraction, and stir until completely Dissolve, then add titanium dioxide with a mass fraction of 5%, and fully disperse to obtain a mixed solution. Let the mixed solution stand at 80°C for 4 hours to obtain a polymer solid electrolyte, which has an ion conductivity of 0.9mS / cm and a migration number of 0.83 at room temperature; inject the mixed solution into the positive electrode layer, diaphragm, and negative electrode layer. In a good button battery or a pouch battery, let it stand at 80°C for 4 hours to obtain a battery containing the polymer solid electrolyte.

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Abstract

The invention discloses a solid electrolyte and a preparation method thereof, and a lithium ion battery and a preparation method thereof. The preparation method of the solid electrolyte comprises the following steps: uniformly mixing a lithium salt, a halogen initiator and an oxygen-containing cyclic ether monomer to obtain a precursor liquid, and initiating in-situ polymerization of the oxygen-containing cyclic ether monomer through the halogen initiator to obtain the high-migration-number polymer solid electrolyte. The solid electrolyte provided by the invention has high ionic conductivity, high transference number and good interface contact with a positive electrode and a negative electrode at room temperature, can effectively enable lithium ion concentration distribution and electric field distribution on the surface of lithium metal to be more uniform, inhibits growth of lithium dendrites, effectively reduces interface impedance between the solid electrolyte and the electrode, and improves the service life of the solid electrolyte. The electrolyte shows excellent stability to a lithium metal negative electrode, so that a solid-state battery containing the electrolyte shows good electrochemical performance.

Description

technical field [0001] The invention belongs to the technical field of solid electrolytes, and more specifically relates to a solid electrolyte and a preparation method thereof, a lithium ion battery and a preparation method thereof. Background technique [0002] Promoting the use of new energy electric vehicles can effectively alleviate the pressure on the environment caused by fuel vehicles, and is also conducive to improving my country's energy structure that relies on oil and gas imports. The most important thing in the development of new energy electric vehicles is to develop high-performance and high-safety lithium-ion batteries to solve the range anxiety and safety problems of electric vehicles. At present, commercial lithium-ion batteries mainly use organic ester electrolytes, which have the problems of easy leakage and flammability, and cannot meet the safety performance requirements of electric vehicles for lithium-ion batteries; at the same time, lithium metal is ...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H01M10/0565H01M10/058H01M10/0525
CPCY02P70/50Y02E60/10
Inventor 许恒辉侯添壹黄云辉
Owner HUAZHONG UNIV OF SCI & TECH
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