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Lithium metal anode sheet, preparation method thereof, and lithium metal battery

A lithium metal anode and lithium ion technology, applied in battery electrodes, secondary batteries, non-aqueous electrolyte storage battery electrodes, etc., can solve problems such as the inability to obtain a nano-level dense protective layer and affect the electrochemical performance of lithium metal batteries. The effect of inhibiting the growth of lithium dendrites, facilitating industrial production, and low swelling coefficient

Active Publication Date: 2016-05-18
CONTEMPORARY AMPEREX TECH CO
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, the nano-level dense protective layer cannot be obtained through existing processes, and there is also the problem that the use of such lithium metal anode sheets seriously affects the electrochemical performance of lithium metal batteries.

Method used

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  • Lithium metal anode sheet, preparation method thereof, and lithium metal battery
  • Lithium metal anode sheet, preparation method thereof, and lithium metal battery
  • Lithium metal anode sheet, preparation method thereof, and lithium metal battery

Examples

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preparation example Construction

[0027] According to the preparation method of the lithium metal anode sheet of the second aspect of the present invention, it is used to prepare the lithium metal anode sheet of the first aspect of the present invention, comprising the steps of: (1) at a temperature T 1 Precursor A is heated to form steam, and then at temperature T 2 xiajing t 1 Time pyrolysis forms free radical monomer; 3 Contact the free radical monomer with the lithium metal anode sheet under t 2 Time, so that a polymer film protective layer with the ability to conduct lithium ions is formed on the surface of the lithium metal anode sheet in situ, and the general formula of the polymer is structural formula 1;

[0028]

[0029] Wherein, X is selected from H or F, Y 1 , Y 2 , Y 3 , Y 4 independently selected from sulfonic acid groups, carboxylic acid groups, amido groups, hydroxyl groups, ether groups, thioether groups, amine groups, H, F or Cl, and Y 1 , Y 2 , Y 3 , Y 4 not simultaneously selec...

Embodiment 1

[0043]

[0044] (1) After heating precursor A1 at 180°C to form steam, raise the temperature to 700°C and treat at this temperature for 5 minutes to form free radical monomers by pyrolysis;

[0045] (2) Introduce the free radical monomer vapor into the vacuum degree P to be 10 -5 bar vacuum chamber, and at 20°C, make it contact with the clean lithium metal anode sheet for 10 min to obtain the lithium metal anode sheet L1 whose surface is covered with a polymer film protective layer with a thickness of 50 nm.

Embodiment 2

[0047]

[0048] (1) After heating the precursor A2 at 350°C to form steam, raise the temperature to 700°C and treat it at this temperature for 15 minutes to form free radical monomers through pyrolysis;

[0049] (2) Introduce the free radical monomer vapor into the vacuum degree P to be 5×10 -6 bar vacuum chamber, and at 40°C, make it contact with the clean lithium metal anode sheet for 30min to obtain the lithium metal anode sheet L2 covered with a polymer film protective layer with a thickness of 300nm.

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Abstract

The invention provides a lithium metal anode sheet, a preparation method thereof, and a lithium metal battery. A polymer thin film protective layer, which has capability of guiding lithium ions, is generated in-situ on the surface of the lithium metal anode sheet. A general formula of the polymer is represented as the structure formula (1), wherein the polymer is formed by free radical polymerization of a precursor A. X is selected from H or F; Y1, Y2, Y3 and Y4 are independently selected from a sulfonic acid group, a carboxylic acid group, an amide group, a hydroxyl group, an ether group, a thioether group, an amine group, H, F or Cl, wherein the Y1, Y2, Y3 and Y4 are not simultaneously selected from the H, F or Cl. The lithium metal battery comprises the lithium metal anode sheet. The preparation method can fully protect the lithium metal anode sheet without influence on the performance thereof, can effectively inhibit growth of lithium dendrites, and can improve cycle performance and safety performance of the lithium metal battery.

Description

technical field [0001] The invention relates to the technical field of batteries, in particular to a lithium metal anode sheet, a preparation method thereof, and a lithium metal battery. Background technique [0002] Li metal anode sheets for Li metal batteries have high mass energy density (3860Ah / kg) and volumetric energy density (2050Ah / L). However, due to the uneven deposition of the lithium metal anode sheet during repeated charging, the growing lithium dendrites will continuously destroy the SEI film on the anode surface, resulting in continuous side reactions at the anode interface. Moreover, the lithium dendrites caused by the uneven deposition of the lithium metal anode sheet during the charging process will form foamy lithium dendrites, and eventually fail due to the loss of electrical contact with the anode. These two factors will greatly reduce the cycle performance of lithium metal batteries. In addition, the continuous growth of lithium dendrites may eventual...

Claims

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Application Information

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IPC IPC(8): H01M4/13H01M4/139H01M10/0525
CPCY02E60/10
Inventor 洪响
Owner CONTEMPORARY AMPEREX TECH CO