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Ultra-thin metal lithium electrode and its preparation and use as secondary lithium battery negative electrode

An ultra-thin metal and lithium electrode technology, applied in lithium batteries, non-aqueous electrolyte batteries, battery electrodes, etc., can solve the problems of mismatching the capacity of metal lithium negative electrode and positive electrode material, waste of metal lithium capacity, and safety hazards, etc. Effects of Coulombic Efficiency and Cyclic Stability, Excellent Safety

Active Publication Date: 2022-06-21
BEIHANG UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

[0007] Aiming at the above-mentioned technical problems such as the capacity mismatch between the metal lithium negative electrode and the positive electrode material in the above-mentioned dilithium secondary battery, resulting in the waste of metal lithium capacity and potential safety hazards, the first aspect of the present invention provides an ultra-thin metal lithium electrode, including a metal lithium layer and A current collector layer, the metal lithium layer is covered on the surface of the current collector layer, the thickness of the metal lithium layer is between 1 μm and 100 μm, and the metal lithium layer includes metal lithium, additive components and skeleton components;

Method used

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  • Ultra-thin metal lithium electrode and its preparation and use as secondary lithium battery negative electrode
  • Ultra-thin metal lithium electrode and its preparation and use as secondary lithium battery negative electrode
  • Ultra-thin metal lithium electrode and its preparation and use as secondary lithium battery negative electrode

Examples

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Embodiment 1

[0042] This embodiment provides a method for preparing an ultra-thin metal lithium electrode of the present invention, such as figure 1 shown, including steps:

[0043] Heating step S101: in the environment of inert gas, heating and melting metal lithium or lithium alloy to obtain liquid metal lithium;

[0044] Mixing step S102: adding the additive component and the skeleton component to the liquid metal lithium in sequence, and after mixing and dispersing, a mixed lithium slurry is obtained;

[0045] Loading step S103 : coating the mixed lithium slurry on the current collector layer to form a thin film layer, and after the thin film layer is cooled and solidified, an ultra-thin metal lithium electrode is obtained.

Embodiment 2

[0047] This embodiment provides another embodiment of the method for preparing an ultra-thin metal lithium electrode of the present invention, such as figure 2 shown, including steps:

[0048] Mixing step S104: in an environment of inert gas, physically mixing metallic lithium or lithium alloy with the additive component and the skeleton component to obtain a mixture;

[0049] Heating step S105: heating the mixture until the metal lithium is melted to obtain a mixed lithium slurry;

[0050] Loading step S106 : coating the mixed lithium slurry on the current collector layer to form a thin film layer, and after the thin film layer is cooled and solidified, an ultra-thin metal lithium electrode is obtained.

[0051] In Examples 1 and 2, the lithium alloy contains alloying elements that reduce the surface tension of liquid metal lithium, the alloying elements include: Mg, Al, In, Zn, Ag, Ca, Sr, Ba, Sc, Y, Rh, One or more of Ir, Pd, Pt, Au, Cd, Hg, Ga, Tl, Ge, Pb, As, Sb, Bi, B...

Embodiment 3

[0057] This example provides a specific implementation method in Example 1, using alloy element Mg, transition metal carbide titanium carbide (Ti 3 C2 F), and the one-dimensional nano-material carbon nanotube of skeleton composition is an example, the preparation method of the ultra-thin metal lithium electrode of the present invention is specifically described, comprising the steps:

[0058] Heating step: in an argon gas (purity greater than 99.999%) environment, add 400 mg of metallic lithium blocks into a stainless steel pot and heat to 200° C. to melt the metallic lithium blocks into a liquid state.

[0059] Mixing step: keep the heating temperature, add 40mg metal magnesium flakes to the liquid metal lithium first, then add 50mg Ti 3 C 2 F, stirring and mixing, the metal magnesium flakes are melted to form a liquid lithium-magnesium alloy, and then 50 mg of carbon nanotubes are added to it, and the stirring is continued for about 30 minutes to make the Ti 3 C 2 F and c...

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Abstract

The invention discloses an ultra-thin metal lithium electrode, its preparation and its use as a secondary lithium battery negative electrode, wherein the ultra-thin metal lithium electrode includes a metal lithium layer and a current collector layer, and the metal lithium layer is covered on the The surface of the current collector layer, the thickness of the metal lithium layer is between 1 μm and 100 μm, and the metal lithium layer includes metal lithium, additive components and skeleton components; material, and / or, an inorganic material capable of being close to liquid metal lithium or a lithium alloy; A three-dimensional network structure is formed inside the lithium metal layer. The ultra-thin metal lithium electrode of the present invention can be used as a negative electrode to manufacture a new type of lithium battery with matching positive and negative electrode capacities, and has better safety and higher energy density because it does not contain excess lithium.

Description

technical field [0001] The invention relates to the field of energy storage batteries, in particular to an ultra-thin metal lithium electrode and its preparation and use as a negative electrode of a secondary lithium battery. Background technique [0002] Lithium metal has always been regarded as the most ideal anode material for lithium batteries, and it has a very high theoretical specific capacity (3860mAh g. -1 ), low density (0.59g cm -3 ) and the most negative electrochemical potential (about -3.04V compared to standard hydrogen electrode) and other excellent properties. As early as the 1970s and 1980s, lithium metal batteries began to be commercialized. In 1972, Exxon Petroleum Company developed Li / TiS. 2 Lithium secondary battery, followed by Li / MnO 2 , Li / Ag 2 V 4 O 11 Lithium metal batteries have been developed one after another, but metal lithium is used as a negative electrode material. During the process of repeated charge and discharge, metal lithium is u...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): H01M4/134H01M4/1395H01M10/052
CPCH01M4/134H01M4/1395H01M10/052Y02E60/10
Inventor 杨树斌
Owner BEIHANG UNIV