Current collector with solid electrolyte interface phase and production method

A technology of solid electrolyte and current collector, applied in the field of electrochemistry, can solve the problems of ignoring the construction of high-quality SEI film, the cycle conversion of lithium anode and the coulombic efficiency that need to be improved urgently, and the inability to fully utilize the high specific surface and internal space of the three-dimensional current collector. To achieve the effect of maintaining cycle stability, superior electrochemical performance, and inhibited growth

Inactive Publication Date: 2019-05-21
XIAMEN UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, most of the current research on current collectors focuses on the improvement of specific surface area, but ignores the construction of high-quality SEI films, resulting in the inability to give full play to the role of the high specific surface and internal space of the three-dimensional current collector. Efficiency still needs to be improved

Method used

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  • Current collector with solid electrolyte interface phase and production method
  • Current collector with solid electrolyte interface phase and production method
  • Current collector with solid electrolyte interface phase and production method

Examples

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Effect test

Embodiment 1

[0032] Sacrifice a thin lithium layer on the current collector to build a solid electrolyte interface phase as follows:

[0033] 1) Introduce a sacrificial lithium thin layer: put a current collector and a metal lithium sheet in the electrolytic cell as the working electrode and counter electrode respectively; inject electrolyte into the electrolytic cell, and apply -0.2V~-0.05V cathode potential or -2mA to the working electrode / cm 2 ~-0.05mA / cm 2 Cathodic current, so that lithium is electrodeposited on the working electrode to obtain a sacrificial lithium thin layer with a thickness of 5 μm to 30 μm; or heat metal lithium to melt it, immerse the current collector in it for a period of time, take it out and cool it to room temperature, and obtain a thin layer of sacrificial lithium with a thickness of 5 μm to 30 μm. 30μm sacrificial lithium thin layer;

[0034] 2) Build solid electrolyte interface phase: After step 1) is completed, apply 0.2V to 2.0V anode potential or 100m...

Embodiment 2

[0037] The difference between this example and Example 1 is that in step 1), copper mesh is used as the working electrode, and a cathode potential of -0.2V is applied to the working electrode, so that lithium is electrodeposited on the working electrode, and a sacrificial lithium thin layer with a thickness of 5 μm is obtained. Others are the same as in Example 1.

Embodiment 3

[0039] The difference between this example and Example 1 is that in step 1), the copper mesh is used as the working electrode, and a cathode potential of -0.05V is applied to the working electrode, so that lithium is electrodeposited on the working electrode, and a sacrificial lithium thin layer with a thickness of 30 μm is obtained. Others are the same as in Example 1.

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Abstract

The invention discloses a current collector. The surface of the current collector has a solid electrolyte interface phase. The solid electrolyte interface phase is prepared by adopting an electrochemical control method after introducing a sacrificing lithium thin layer, wherein the sacrificing lithium thin layer is formed by metal lithium with a certain thickness by the adoption of an electro-deposition or non-electro-deposition method.

Description

technical field [0001] The invention belongs to the technical field of electrochemistry, and in particular relates to a method for constructing a solid electrolyte interface phase by sacrificing a thin lithium layer on a current collector and its application. Background technique [0002] Lithium metal has the characteristics of light weight and low electrode potential, and its negative electrode has a specific capacity as high as 3860mAh / g. It is an ideal negative electrode for the rapidly developing next-generation high-energy batteries such as lithium-sulfur and lithium-air batteries. However, lithium anodes are prone to grow dendrites, and the deposition-dissolution process accompanied by large volume changes can lead to the rupture of the solid electrolyte interfacial phase (SEI). The damaged and uneven SEI further promotes the growth of lithium dendrites, and leads to The formation of "dead lithium" causes low cycle performance of lithium anodes and consumes additional...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H01M4/64H01M10/052H01M10/0525H01M12/08
CPCH01M4/0445H01M4/661H01M4/667H01M4/74H01M4/75H01M10/4235Y02E60/10H01M4/0404H01M10/0525
Inventor 毛秉伟谷宇徐洪雨王卫伟颜佳伟董全峰郑明森
Owner XIAMEN UNIV
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