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Liquid metal negative pole piece as well as preparation method and application thereof

A negative electrode pole piece and liquid metal technology, which is applied in the field of lithium ion solid-state battery liquid metal negative pole piece and its preparation, can solve the problems of large interface impedance of all solid electrolytes, lower lithium ion conductivity, and lower lithium ion density. Improve the critical current density, the preparation method is simple and efficient, and the effect of solving the interface contact problem

Pending Publication Date: 2022-02-25
EVE ENERGY CO LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

However, using activated carbon fiber as the negative electrode carrier, the interface resistance of the prepared all-solid electrolyte is large.
[0007] CN105470466A discloses an all-solid-state battery with a framework supporting alloy negative electrode and its preparation method. Lithium-boron alloy foil is used as the all-solid-state lithium battery negative electrode material, but after being prepared as an alloy with boron, the density of lithium ions in the negative electrode decreases, which will reduce the Li-ion conductivity of
However, the price of garnet solid electrolyte is high, which is not suitable for industrial production

Method used

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  • Liquid metal negative pole piece as well as preparation method and application thereof
  • Liquid metal negative pole piece as well as preparation method and application thereof
  • Liquid metal negative pole piece as well as preparation method and application thereof

Examples

Experimental program
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Effect test

Embodiment 1

[0039] This embodiment provides a method for preparing a solid-state battery containing a liquid metal negative pole piece:

[0040] Step 1: Take LLTO with a thickness of about 1mm and a diameter of 10mm as solid electrolyte 1, use LLTO to polish, ultrasonically clean, and heat treat at 500°C for 3 hours to remove LiCO 3, LiOH, the electrolyte is purged with nitrogen to remove impurities, dust, etc. remaining on the surface;

[0041] Step 2: Melt pure sodium and pure potassium and transfer them into a glass bottle according to the ratio of 1:1, heat to a single-phase liquid state and mix evenly and cool to prepare Na-K alloy, namely liquid alloy 2;

[0042] Step 3: Take a lithium metal sheet 3 with a diameter of 8 mm, and apply 4 μL of Na-K alloy, that is, liquid alloy 2, to one side of the lithium sheet, and coat evenly;

[0043] Step 4: Contact the Na-K alloy-coated side of the lithium metal sheet with the LLTO sheet, assemble a pair of lithium batteries, measure the critic...

Embodiment 2

[0045] This embodiment provides a method for preparing a solid-state battery containing a liquid metal negative pole piece:

[0046] Step 1: Take LLZTO with a thickness of about 1mm and a diameter of 12mm as solid electrolyte 1, use LLZTO to polish, ultrasonically clean, and heat treat at 500°C for 3 hours to remove LiCO 3 , LiOH, the electrolyte is purged with nitrogen to remove impurities, dust, etc. remaining on the surface;

[0047] Step 2: After melting pure tin and pure copper, transfer them into a glass bottle according to the ratio of 4:1, heat them until they are in a single-phase liquid state, mix them evenly and cool them down to prepare a Cu-Sn alloy, namely Liquid Alloy 2;

[0048] Step 3: Take a lithium metal sheet 3 with a diameter of 9 mm, and coat 5 μL of Cu-Sn alloy on one side of the lithium sheet, and coat evenly;

[0049] Step 4: Contact the Cu-Sn alloy-coated side of the lithium metal sheet with the LLZTO sheet, assemble a lithium battery, measure the cr...

Embodiment 3

[0051] This embodiment provides a method for preparing a solid-state battery containing a liquid metal negative pole piece:

[0052] Step 1: Take a PEO polymer electrolyte with a thickness of about 1mm and a diameter of 11mm as the solid electrolyte 1. Use the PEO polymer electrolyte to polish, ultrasonically clean, and heat treat at 500°C for 3 hours to remove LiCO 3 , LiOH, the electrolyte is purged with nitrogen to remove impurities, dust, etc. remaining on the surface;

[0053] Step 2: After melting pure aluminum and pure copper, transfer them into a glass bottle according to the ratio of 4:1, heat them until they are in a single-phase liquid state, mix them evenly and cool them down, and prepare an Al-Cu alloy, that is, liquid alloy 2;

[0054] Step 3: Take a lithium metal sheet 3 with a diameter of 9 mm, and coat 5 μL of Al-Cu alloy on one side of the lithium sheet, and coat evenly;

[0055] Step 4: Contact the Al-Cu alloy-coated side of the lithium metal sheet with the...

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Abstract

The invention provides a liquid metal negative pole piece as well as a preparation method and application thereof. And the surface of the negative pole piece is coated with a liquid alloy. The invention provides a liquid metal electrode of which the surface of metal lithium is coated with a liquid alloy, so the interface contact between an electrolyte and a negative electrode is improved, the critical current density of a solid electrolyte is greatly improved, pores generated by lithium removal can be filled in a circulating process, self-healing of an interface is realized, formation and growth of lithium dendrites are avoided, and the interface contact problem is effectively solved.

Description

technical field [0001] The invention relates to a lithium ion battery, in particular to a lithium ion solid state battery, in particular to a lithium ion solid state battery liquid metal negative pole piece and a preparation method and application thereof. Background technique [0002] With the popularization of the concept of green environmental protection, new energy lithium batteries rely on their advantages such as high voltage, high energy density, long cycle life, and wide electrochemical window. And many other aspects have been widely used, which also puts forward higher requirements for lithium batteries. The energy density of single batteries should reach 500Wh / kg; in addition, there are higher requirements for battery life and safety performance. need. [0003] Solid-state lithium batteries are considered to be the development direction of lithium batteries in the future. Solid-state lithium batteries use solid-state electrolytes to replace the diaphragm and elect...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H01M4/13H01M4/139H01M10/0525
CPCH01M4/13H01M4/139H01M10/0525Y02E60/10
Inventor 张典政陈规伟冀亚娟
Owner EVE ENERGY CO LTD
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