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Lithium-stable succinonitrile-based solid electrolyte, preparation method and application thereof

A solid electrolyte, succinonitrile technology, applied in the direction of solid electrolyte, non-aqueous electrolyte, electrolyte immobilization/gelation, etc., can solve the problems of unsatisfactory improvement of lithium stability, loss of solid state characteristics of electrolyte, etc., to improve performance , reduce the interface impedance and improve the effect on lithium stability

Active Publication Date: 2019-04-16
NORTHWESTERN POLYTECHNICAL UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, these works may lead to the loss of solid-state characteristics of the electrolyte, or the degree of improvement in the stability of lithium is not ideal.

Method used

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  • Lithium-stable succinonitrile-based solid electrolyte, preparation method and application thereof
  • Lithium-stable succinonitrile-based solid electrolyte, preparation method and application thereof
  • Lithium-stable succinonitrile-based solid electrolyte, preparation method and application thereof

Examples

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Effect test

Embodiment 1

[0026] A succinonitrile-based solid electrolyte stable to lithium, made of the following components by weight percentage: succinonitrile 85%, LiN(CF 3 SO 2 ) 2 10%, SO 2 Gas 5%.

[0027] The above-mentioned preparation method of lithium-stabilized succinonitrile-based solid-state electrolyte specifically comprises the following steps:

[0028] S1, take by weight percent succinonitrile 85%, LiN(CF 3 SO 2 ) 2 10%, SO 2 Gas 5%;

[0029] S2, heat the succinonitrile weighed in S1 to melting at 70°C, add the LiN(CF) weighed in S1 3 SO 2 ) 2 , stirred for 8h to disperse evenly to obtain a mixed solution, and then a certain flow of SO 2 gas for 10 minutes (make SO 2 The amount of gas reaches the percentage by weight of the film-forming additive in S1), after the aeration ends, stir at 70°C for 8h to SO 2 The gas is completely dissolved into the mixed solution to obtain an electrolyte, and then the electrolyte is drip-coated on the surface of the porous diaphragm, and na...

Embodiment 2

[0032] A succinonitrile-based solid electrolyte stable to lithium, made of the following components by weight percentage: succinonitrile 50%, LiN(CF 3 SO 2 ) 2 40%, SO 2 Gas 10%.

[0033] The above-mentioned preparation method of lithium-stabilized succinonitrile-based solid-state electrolyte specifically comprises the following steps:

[0034] S1, take by weight percentage succinonitrile 50%, LiN(CF 3 SO 2 ) 2 40%, SO 2 Gas 10%;

[0035] S2, heat the succinonitrile weighed in S1 to melting at 80°C, add the LiN(CF) weighed in S1 3 SO 2 ) 2 , stirred for 8h to disperse evenly to obtain a mixed solution, and then a certain flow of SO 2 gas for 10 minutes (make SO 2 The amount of gas reaches the percentage by weight of the film-forming additive in S1), after the aeration ends, stir at 80°C for 8h to SO 2 The gas is completely dissolved into the mixed solution to obtain an electrolyte, and then the electrolyte is drip-coated on the surface of the porous diaphragm, a...

Embodiment 3

[0038] A succinonitrile-based solid electrolyte stable to lithium, made of the following components by weight percentage: succinonitrile 89%, LiN(CF 3 SO 2 ) 2 10%, SO 2 Gas 1%.

[0039] The above-mentioned preparation method of lithium-stabilized succinonitrile-based solid-state electrolyte specifically comprises the following steps:

[0040] S1, take by weight percent succinonitrile 89%, LiN(CF 3 SO 2 ) 2 10%, SO 2 Gas 1%;

[0041]S2, heat the succinonitrile weighed in S1 to melting at 70°C, add the LiN(CF) weighed in S1 3 SO 2 ) 2 , stirred for 8h to disperse evenly to obtain a mixed solution, and then a certain flow of SO 2 gas for 10 minutes (make SO 2 The amount of gas reaches the percentage by weight of the film-forming additive in S1), after the aeration ends, stir at 90°C for 8h to SO 2 The gas is completely dissolved in the mixed solution to obtain an electrolyte, and then the electrolyte is drip-coated on the surface of the porous diaphragm, and natur...

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Abstract

The invention discloses a lithium-stable succinonitrile-based solid electrolyte, which is prepared from the following components by weight: 50-89% of succinonitrile, 10%-40% of lithium salt, 0.1%-10%of a film-forming additive. The invention also discloses a preparation method of the lithium-stable succinonitrile-based solid electrolyte, which comprises the following steps: S1, weighing the succinonitrile, the lithium salt, the film-forming additive according to the weight percentage; S2, heating the succinonitrile weighed in the S1 to melt, and adding the lithium salt weighed in S1, performing stirring for 8 hours to obtain a mixed solution, and then adding the film-forming additive weighed in S1, and performing stirring at 60 to 100 DEG C for 8 to 12 hours to obtain an electrolyte, and then dropping the electrolyte on a surface of the porous membrane to obtain a succinonitrile-based solid electrolyte. The invention also discloses the application of the solid electrolyte to an all-solid lithium battery, and the solid electrolyte can reduce the interface impedance between the solid electrolyte and the Li sheet and improve the performance of the battery.

Description

technical field [0001] The invention relates to the technical field of ion batteries, in particular to a succinonitrile-based solid electrolyte stable to lithium, a preparation method and an application thereof. Background technique [0002] Lithium-ion batteries have been widely used as power sources for modern portable electronic devices such as laptops, mobile phones, etc. However, most of these battery electrolyte solvents are easily leaking organic solvents, and the solvents are flammable. In order to avoid such safety problems, it is necessary to replace the liquid electrolyte with a non-flammable or non-flammable electrolyte. [0003] Moreover, the practicability of lithium battery electrolytes depends on the lithium ion migration number of the electrolyte, the electrochemical window, the plastic crystal temperature range, and the stability to lithium. Lithium metal as a light (density = 0.534g / cm 3 ), the electrode material with low potential (-3.045V vs SHE) has ...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H01M10/0565H01M10/0525
CPCH01M10/0525H01M10/0565H01M2300/0085H01M2300/0082Y02E60/10
Inventor 谢科予沈超侯倩
Owner NORTHWESTERN POLYTECHNICAL UNIV
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