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Modified solid electrolyte as well as preparation method and application thereof

A solid electrolyte and electrolyte technology, applied in circuits, electrical components, secondary batteries, etc., can solve problems such as uncontrollable safety, battery short circuit, poor safety, etc., achieve good versatility, improve stability, and benefit the industry Magnified effect

Pending Publication Date: 2021-07-20
EVE ENERGY CO LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, the solid electrolyte prepared by it has poor interface contact with lithium metal, and it is easy to generate lithium dendrites in places with high current density, penetrating the electrolyte and causing short circuit of the battery, and the safety is poor.
[0006] The above scheme has the problem of uncontrollability or poor safety. Therefore, it is necessary to develop a modified solid electrolyte suitable for solid electrolyte systems with controllable lithium nitride layer and good safety.

Method used

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  • Modified solid electrolyte as well as preparation method and application thereof

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Embodiment 1

[0041] This embodiment provides a modified solid electrolyte, and the preparation method of the modified solid electrolyte is as follows:

[0042] (1) Purge the PVDF-based polymer electrolyte with nitrogen before use to remove impurities and dust remaining on the surface, and use non-stick adhesive to fix the oxide electrolyte sheet on the substrate of the high-vacuum thermal evaporation coating device;

[0043] (2) Place the metal lithium sheet in a tantalum evaporation crucible, and control the vacuum degree to 10 -5 Pa, the steam flow rate is Evaporate onto the surface of the oxide electrolyte sheet, and control the thickness of the evaporated layer to 100nm;

[0044] (3) Pass the solid electrolyte deposited with metal lithium obtained in step (2) into high-purity nitrogen gas (99.999%) to react with lithium metal, and generate Li in situ on the surface of the electrolyte 3 The N protective layer is subjected to one isostatic cold pressing under 12Mpa to obtain the modif...

Embodiment 2

[0047] This embodiment provides a modified solid electrolyte, and the preparation method of the modified solid electrolyte is as follows:

[0048] (1) Before using the PEO-based polymer electrolyte, purge the electrolyte with nitrogen gas to remove impurities, dust, etc. remaining on the surface, and use non-stick adhesive to fix the oxide electrolyte sheet on the substrate of the high-vacuum thermal evaporation coating device;

[0049] (2) Place the metal lithium sheet in a tantalum evaporation crucible, and control the vacuum degree to 5×10 -5 Pa, the steam flow rate is , vapor-deposited on the surface of the oxide electrolyte sheet, and the thickness of the vapor-deposited layer is controlled to be 80nm;

[0050] (3) Pass the solid electrolyte deposited with metal lithium obtained in step (2) into high-purity nitrogen gas (99.999%) to react with lithium metal, and generate Li in situ on the surface of the electrolyte 3 The N protective layer is subjected to one isostatic...

Embodiment 3

[0052] The only difference between this embodiment and embodiment 1 is that the thickness of the evaporated layer in step (2) is 50 nm, and other conditions and parameters are exactly the same as those of embodiment 1.

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Abstract

The invention provides a modified solid electrolyte as well as a preparation method and application thereof. The preparation method comprises the following steps: (1) carrying out surface impurity removal treatment on the solid electrolyte, and fixing; (2) depositing metal lithium on the surface of the solid electrolyte to obtain the solid electrolyte deposited with the metal lithium; and (3) carrying out nitridation treatment on the solid electrolyte deposited with the metal lithium obtained in the step (2), and then carrying out isostatic pressing cold pressing treatment to obtain the modified solid electrolyte. Metal lithium is deposited on the surface of the solid electrolyte, and then nitridation treatment is carried out on the metal lithium, so that a Li3N protection layer is generated on the surface of the electrolyte in situ; li3N has high ionic conductivity and low electronic conductivity, is an ideal interface modification protective layer, and can effectively improve the stability between the electrolyte and lithium metal.

Description

technical field [0001] The invention belongs to the field of lithium ion batteries, and relates to a modified solid electrolyte and a preparation method and application thereof. Background technique [0002] Thanks to a series of state subsidy policies for the electric vehicle industry, the domestic electric vehicle market has developed rapidly. Based on the existing liquid electrolyte lithium-ion power battery system, the energy density and safety performance of batteries will be difficult to meet national requirements after 2025. Replacing traditional liquid electrolytes with non-flammable solid electrolytes can increase the energy density of batteries by about 66% while ensuring battery safety performance, so solid-state batteries are considered to be an important direction for next-generation battery technology. [0003] To increase the energy density of solid-state batteries, lithium metal anodes must be used. However, none of the existing solid-state electrolytes can...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H01M10/0562H01M10/0565H01M10/0525C23C14/18C23C14/20C23C14/24C23C14/58
CPCH01M10/0525H01M10/0565H01M10/0562C23C14/18C23C14/20C23C14/24C23C14/586C23C14/5886Y02E60/10
Inventor 陈规伟冀亚娟
Owner EVE ENERGY CO LTD
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