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Electrolyte for solid electrolyte-containing lithium secondary battery and application thereof

A lithium secondary battery and solid electrolyte technology, which is applied in the field of lithium secondary batteries, can solve problems such as sulfide chemical instability, achieve the effects of reducing interface impedance, improving ion conduction, and improving performance

Active Publication Date: 2020-05-29
CHINA AUTOMOTIVE BATTERY RES INST CO LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0009] In summary, ionic liquids and common electrolytes are mostly used in the prior art. Due to the chemical instability of sulfides, they are easy to react with polar solvents, and halide solid electrolytes are also easy to react with ionic liquids and conventional electrolytes. Find a stable solvent with solid electrolytes and prepare new electrolytes

Method used

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  • Electrolyte for solid electrolyte-containing lithium secondary battery and application thereof
  • Electrolyte for solid electrolyte-containing lithium secondary battery and application thereof
  • Electrolyte for solid electrolyte-containing lithium secondary battery and application thereof

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0047] In a glove box full of argon (moisture 1ppm, oxygen 1ppm) weigh 15.4g of n-butyl ether as an organic solvent, then add lithium salt LiFSI to it to form an electrolyte solution of 1mol / L, and obtain The solid-liquid mixture of the electrolyte is the electrolyte of the lithium secondary battery, and the conductivity of the electrolyte is tested using a conductivity tester.

Embodiment 2

[0049] In a glove box full of argon (moisture 1ppm, oxygen 1ppm), take by weighing 15.6g of n-pentyl ether as an organic solvent, then add lithium salt LiFSI to it to form an electrolyte solution of 1mol / L, and obtain a solution that can be used to contain solid-state electrolytes. The solid-liquid mixed lithium secondary battery electrolyte, using a conductivity tester, test the conductivity of the electrolyte.

Embodiment 3

[0051] In a glove box full of argon (moisture 1ppm, oxygen 1ppm), take 15.5g of isoamyl ether as an organic solvent, and then add lithium salt LiFSI to it to form an electrolyte solution of 1mol / L, and obtain a solid-state electrolyte that can be used The solid-liquid mixed lithium secondary battery electrolyte, using a conductivity tester, test the conductivity of the electrolyte.

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Abstract

The invention discloses an electrolyte for a solid electrolyte-containing lithium secondary battery and application of the electrolyte. The electrolyte comprises a lithium salt and a non-aqueous organic solvent; the non-aqueous organic solvent is an ether compound and / or a non-ether organic matter with polarity smaller than that of diethyl ether; and the non-aqueous organic solvent does not dissolve a solid electrolyte and does not react with the solid electrolyte. The electrolyte provided by the invention can be used as an electrolyte of the lithium secondary battery, can also be used as an additive of a solid-state battery, and can achieve the effects of improving ion conduction and reducing interface impedance, thereby effectively improving the performance of the solid-state battery.

Description

technical field [0001] The invention belongs to the technical field of lithium secondary batteries, and in particular relates to an electrolyte solution for lithium secondary batteries containing a solid electrolyte and an application thereof. Background technique [0002] With the rapid development of solid-state electrolytes, various types of solid-state electrolyte materials such as sulfide electrolyte materials, oxide electrolyte materials, and halide electrolyte materials have been developed. Among them, the ionic conductivity of halide solid-state electrolytes can be as high as 2.05× 10 -3 S / cm (Angew.Chem.Int.Ed.2019, 58, 1-8), the material is compatible with commonly used commercial oxide cathode materials such as LCO, NMC, etc., which is expected to realize the commercial application of all-solid-state secondary batteries value. [0003] In the current lithium secondary battery system, the solid-state battery uses a new solid-state electrolyte to replace the curre...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H01M10/0569H01M10/0525
CPCH01M10/0525H01M10/0569H01M2300/0028Y02E60/10
Inventor 赵春荣赵尚骞赵金玲朱秀龙弓胜民张立王建涛庞静杨娟玉
Owner CHINA AUTOMOTIVE BATTERY RES INST CO LTD
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