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A kind of lithium ion solid electrolyte and its preparation method and application

A solid electrolyte, lithium ion technology, applied in the field of lithium ion solid electrolyte and its preparation, can solve the problem of high interface impedance between solid electrolyte and lithium sheet, and achieve the effects of improving cycle stability, reducing interface impedance and inhibiting reaction

Active Publication Date: 2020-10-27
NANJING UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

[0003] The technical problem to be solved: the tetravalent germanium in the NASICON type lithium-ion solid electrolyte containing tetravalent germanium ions in the above-mentioned prior art will be reduced to zero-valent or divalent germanium by metal lithium, and the gap between the solid electrolyte and the lithium sheet In view of technical problems such as large interface impedance, the present invention provides a lithium-ion solid electrolyte and its preparation method and application, which can make the contact between the electrolyte and lithium metal more closely while inhibiting the reduction of tetravalent germanium, and can also effectively inhibit the formation of lithium dendrites. Production

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  • A kind of lithium ion solid electrolyte and its preparation method and application
  • A kind of lithium ion solid electrolyte and its preparation method and application
  • A kind of lithium ion solid electrolyte and its preparation method and application

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Embodiment 1

[0028] A lithium ion solid electrolyte, comprising a NASICON type lithium ion solid electrolyte sheet containing tetravalent germanium ions and a Ge film, the Ge film is plated on the surface of the NASICON type lithium ion solid electrolyte sheet containing tetravalent germanium ions, and the coating thickness is 10 nm. The mass of the NASICON type lithium ion solid electrolyte sheet containing tetravalent germanium ions is 0.1 mg. The NASICON type lithium ion solid electrolyte containing tetravalent germanium ions is Li 1.4 Al 0.4 Ge 1.6 o 12 .

[0029] The preparation method of the described lithium ion solid electrolyte, the preparation method comprises preparing the NASICON type lithium ion solid electrolyte sheet Li containing tetravalent germanium ions by the traditional solid phase method 1.4 Al 0.4 Ge 1.6 o 12, the preparation method also includes the following steps: the NASICON type lithium ion solid electrolyte sheet Li containing tetravalent germanium ions...

Embodiment 2

[0035] A lithium ion solid electrolyte, comprising a NASICON type lithium ion solid electrolyte sheet containing tetravalent germanium ions and a Ge film, the Ge film is plated on the surface of the NASICON type lithium ion solid electrolyte sheet containing tetravalent germanium ions, and the coating thickness is 200 nm. The mass of the NASICON type lithium ion solid electrolyte sheet containing tetravalent germanium ions is 1.0 mg. The NASICON type lithium ion solid electrolyte containing tetravalent germanium ions is Li 1.4 Al 0.4 Ge 1.6 o 12 .

[0036] The preparation method of the lithium ion solid electrolyte, the preparation method includes preparing a NASICON type lithium ion solid electrolyte sheet containing tetravalent germanium ions by a traditional solid phase method, and the preparation method also includes the following steps: The surface of the NASICON-type lithium-ion solid electrolyte sheet was polished with sandpaper, then ultrasonically cleaned in etha...

Embodiment 3

[0042] A lithium ion solid electrolyte comprises a NASICON type lithium ion solid electrolyte sheet containing tetravalent germanium ions and a Ge film, and the Ge film is plated on the surface of the NASICON type lithium ion solid electrolyte sheet containing tetravalent germanium ions. Wherein the NASICON type lithium ion solid electrolyte sheet containing tetravalent germanium ions is LAGP (Li 1.5 Al 0.5 Ge 1.5 P 3 o 12 ) solid electrolyte sheet. figure 1 It is a schematic diagram of the contact structure of the LAGP solid electrolyte sheet before and after germanium plating on the surface of the present invention. In the figure, a shows that the solid electrolyte film is in closer contact with lithium, and b in the figure is a diagram of the valence state change of germanium ions before and after the solid electrolyte film. As shown in the figure, the LAGP solid electrolyte sheet is in closer contact with lithium after coating. When the LAGP sheet is in contact with li...

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Abstract

A lithium ion solid electrolyte and preparation method and application thereof belong to the technical field of a battery. The lithium ion solid electrolyte comprises an NASICON-type lithium ion solidelectrolyte sheet containing tetravalent germanium ions and a Ge film, wherein the Ge film is plated on a surface of the NASICON-type lithium ion solid electrolyte sheet containing the tetravalent germanium ions, and the plating thickness is 10-200 nanometers. By plating the Ge thin film with a certain thickness on a surface of the solid electrolyte LAGP, on one hand, the reduction of tetravalentgermanium is suppressed, and the electrolyte is protected; and on the other hand, the electrolyte and metal lithium are in more close contact, and the interface impedance of a solid battery is reduced. Moreover, the lithium dendrites also can be effectively prevented by the solid electrolyte with a protected surface, so that the cycle stability and the coulombic efficiency of the battery are improved, and the effects of reducing the interface impedance of the solid battery and improving the interface stability are achieved.

Description

technical field [0001] The invention relates to the technical field of batteries, in particular to a lithium-ion solid electrolyte and a preparation method and application thereof. Background technique [0002] Lithium-ion batteries have received extensive attention and application because of their high specific energy density. Most current lithium-ion batteries use organic electrolytes to transport lithium ions. However, these organic electrolytes have potential safety hazards, and problems such as leakage, combustion, and explosion may occur. In addition, during the battery cycle of a lithium battery using metallic lithium as the negative electrode, lithium dendrites on the negative electrode will grow and may pierce the electrolyte layer, resulting in a short circuit of the battery, resulting in safety accidents such as combustion or explosion. To fundamentally solve this problem, the researchers used solid-state electrolytes as lithium-ion conductors. Solid electrolyt...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): H01M10/0562H01M10/0525H01M12/08
CPCH01M10/0525H01M10/0562H01M12/08H01M2300/0068Y02E60/10
Inventor 何平刘一杰周豪慎
Owner NANJING UNIV