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Preparation method of all-solid-state battery interface layer and all-solid-state battery

An all-solid-state battery and interface layer technology, which is applied in the direction of lithium batteries, secondary batteries, solid electrolytes, etc., can solve the problems of interface layer loss, SN melting point reduction, etc., to suppress side reactions, improve stability, and reduce interface The effect of impedance

Pending Publication Date: 2021-03-26
SHANGHAI INST OF SPACE POWER SOURCES
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, FEC or LiNO 3 The addition of SN will cause the melting point of SN to decrease. When it is greater than 25 ° C, it exists in the form of a solution. At this time, it is easy to cause it to be lost from the electrode / electrolyte interface when it is used as an interface layer.

Method used

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  • Preparation method of all-solid-state battery interface layer and all-solid-state battery

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preparation example Construction

[0037] The invention provides a method for preparing an interface layer of an all-solid-state battery, the interface layer is arranged between a solid electrolyte and an electrode, and the method includes the following steps:

[0038] Step 1, heating and dissolving lithium salt, a stabilizer for stabilizing lithium, and succinonitrile and mixing to obtain a mixed solution;

[0039] Step 2, adding the polymer into the mixed solution, dissolving and mixing, and cooling to obtain a gel state interface layer; the polymer includes: one of polyethylene oxide, polyvinyl alcohol, and polyacrylonitrile or two or more.

[0040] In some embodiments, the stabilizer is fluoroethylene carbonate (FEC) or LiNO 3 .

[0041] Succinonitrile (SN) is solid at room temperature with a melting point of 55-60°C. SN has a strong ability to dissolve lithium salts. After adding a small amount of lithium salts, the ion conductivity at room temperature can reach 10 -3S / cm order of magnitude. As a plas...

Embodiment 1

[0050] Add succinonitrile and 5mol% LiTFSI into a glass sample bottle, heat and stir at 60°C to dissolve. After obtaining a clear solution, add 3wt% FEC and stir well. Then, add PEO, stir to dissolve, the mass ratio of PEO and succinonitrile is 1:10. Finally, the obtained interface layer is subjected to vacuum defoaming treatment.

Embodiment 2

[0052] Add succinonitrile and 5mol% LiTFSI into a glass sample bottle, heat and stir at 60°C to dissolve. After obtaining a clear solution, add 7wt% FEC and stir well. Then, add PEO, stir to dissolve, the mass ratio of PEO and succinonitrile is 1:10. Finally, the obtained interface layer is subjected to vacuum defoaming treatment.

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Abstract

The invention discloses a preparation method of an interface layer of an all-solid-state battery and the all-solid-state battery, the interface layer is arranged between a solid electrolyte and an electrode, and the method comprises the following steps: step 1, heating, dissolving and uniformly mixing a lithium salt, a stabilizer for stabilizing lithium and succinonitrile to obtain a mixed solution; step 2, adding a polymer into the mixed solution, dissolving, uniformly mixing, and cooling to obtain an interface layer in a gel state; wherein the polymer comprises one or more than two of polyoxyethylene, polyvinyl alcohol and polyacrylonitrile. The added polymer can improve the liquid retention capacity of the interface layer, and the interface layer is a colorless and transparent gel-statesubstance. Besides, due to the addition of the polymer, the interface layer has good viscosity, the contact performance of the interface layer with the electrode and the solid electrolyte can be improved, and the interface impedance is reduced.

Description

technical field [0001] The invention relates to the field of new energy materials, in particular to a method for preparing an interface layer of an all-solid-state battery and the all-solid-state battery. Background technique [0002] With the development of electric vehicles and large-scale energy storage systems, people put forward the requirements of high energy density and high safety for chemical energy storage technology. At present, lithium-ion batteries use organic electrolytes. Because organic electrolytes are flammable and have a narrow electrochemical stability window, traditional lithium-ion batteries not only have the disadvantages of insufficient theoretical energy density, but also have the disadvantages of leakage, Safety risk of burning or even explosion. The development of all-solid-state batteries with solid electrolytes instead of organic electrolytes is expected to solve these problems. [0003] However, due to the poor solid-solid interfacial contact ...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H01M10/0565H01M10/052
CPCH01M10/0565H01M10/052H01M2300/0082Y02E60/10
Inventor 吴洁朱蕾吴勇民高靖雄刘通韩松益汤卫平
Owner SHANGHAI INST OF SPACE POWER SOURCES
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