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Metal lithium anode with protective coating, preparation thereof and application of metal lithium anode

A protective coating, metal lithium technology, applied in the field of electrochemistry, can solve the problems of low coulombic efficiency and poor cycle performance

Active Publication Date: 2016-11-23
QINGDAO INST OF BIOENERGY & BIOPROCESS TECH CHINESE ACADEMY OF SCI
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0006] The purpose of the present invention is to solve the problems of low coulombic efficiency, poor cycle performance and safety caused by the side reaction of lithium metal and electrolyte to generate lithium dendrites. The present invention provides a metal lithium negative electrode with a protective coating and its molecular layer-based Preparation method and application of self-assembly

Method used

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  • Metal lithium anode with protective coating, preparation thereof and application of metal lithium anode
  • Metal lithium anode with protective coating, preparation thereof and application of metal lithium anode
  • Metal lithium anode with protective coating, preparation thereof and application of metal lithium anode

Examples

Experimental program
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Effect test

Embodiment 1

[0025] Will 1g n=10-100000, dissolved in 10ml acetone, stirred evenly to dissolve completely to form a homogeneous solution, then formed a film on the surface of metal lithium by spin coating, and then dried in a vacuum oven at room temperature for 8 hours to completely remove acetone. The metal lithium coated with the protective layer was heated at 40° C. for 2 h under an Ar gas atmosphere, so that the polymer chain segments were arranged regularly. Then soak in THF alkaline solution for 6h, dry to remove THF, transfer to the cavity of atomic layer deposition (ALD), use the metal lithium coated with protective layer as the substrate, and use the fast ion conductor Li 7 La3 Zr 2 o 12 As the target material, a fast ion conductor layer is sputtered.

[0026] LiCoO 2 as the positive electrode, with LiPF 6 / EC: DMC (1:1) is the electrolyte, and the lithium metal with a protective coating is used as the negative electrode to assemble the battery. The battery performance is ...

Embodiment 2

[0028] 1.5g n=10-100000, dissolved in 10ml acetone, stirred evenly to dissolve completely to form a homogeneous solution, then formed a film on the surface of metal lithium by spin coating, and then dried in a vacuum oven at room temperature for 8 hours to completely remove acetone. The metal lithium coated with the protective layer was heated at 50° C. for 3 h under an Ar gas atmosphere, so that the polymer chain segments were arranged regularly. Then soak in THF alkaline solution for 6h, dry to remove THF, transfer to the cavity of ALD, use the metal lithium coated with the protective layer as the substrate, and use the fast ion conductor Li 1.3 al 0.3 Ti 1.7 (PO 4 ) 3 As the target material, a fast ion conductor layer is sputtered.

[0029] LiCoO 2 as the positive electrode, with LiPF 6 / EC: DMC (1:1) is the electrolyte, and the lithium metal with a protective coating is used as the negative electrode to assemble the battery. The battery performance is shown in Ta...

Embodiment 3

[0031] Will 1g n=10-100000, dissolved in 10ml acetone, stirred evenly to dissolve completely to form a homogeneous solution, then formed a film on the surface of metal lithium by spin coating, and then dried in a vacuum oven at room temperature for 8 hours to completely remove acetone. The metal lithium coated with the protective layer was heated at 60° C. for 3 h under an Ar gas atmosphere, so that the polymer chain segments were arranged regularly. Then soak in THF alkaline solution for 6h, then vacuum dry at room temperature to remove THF, transfer to the cavity of ALD, use the metal lithium coated with the protective layer as the substrate, and use TiO 2 As the target material, a fast ion conductor layer is sputtered.

[0032] LiCoO 2 as the positive electrode, with LiPF 6 / EC: DMC (1:1) is the electrolyte, and the lithium metal with a protective coating is used as the negative electrode to assemble the battery. The battery performance is shown in Table 1.

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Abstract

The invention relates to a metal lithium anode with a protective coating and a preparation method based on molecule layer-by-layer self-assembly. The substance of the coating is a solid electrolyte interface membrane constructed by an assembling molecule layer and an inorganic fast ion conductor layer on an active material layer surface of the metal lithium anode. The solid electrolyte interface membrane has the following functions: (1) electrolyte solution and lithium wafers are effectively isolated and the lithium wafers are prevented from being eroded and reacted; (2) lithium ions are uniformly distributed and generation of lithium dendrites is restrained; (3) inorganic fast ion conductors can transmit the lithium ions, and membrane strength is effectively improved. Metal lithium electrode pieces protected by the protective coating are used in lithium batteries, the coulombic efficiency of the batteries can be effectively improved, and circulation life is prolonged.

Description

technical field [0001] The invention belongs to the technical field of electrochemistry, and relates to a lithium negative electrode with a protective coating and its application in lithium batteries. Background technique [0002] With the development of society and the advancement of science and technology, various portable electronic products have gradually become an indispensable part of human daily life. At present, lithium-ion batteries, as the main energy storage devices, are widely used not only in portable electronic products but also in electric vehicles, smart grids, national defense, aerospace, etc. due to their high working voltage, good cycle performance, high energy density and power density, and environmental friendliness Fields also have their place. However, with the increase of demand, traditional lithium-ion batteries are gradually unable to meet the needs, so it is necessary to develop next-generation lithium batteries with high safety, high energy densi...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H01M4/134H01M4/1395
CPCH01M4/134H01M4/1395Y02E60/10
Inventor 崔光磊张舒王庆富胡正林徐红霞
Owner QINGDAO INST OF BIOENERGY & BIOPROCESS TECH CHINESE ACADEMY OF SCI
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