3D lithium-philic composite porous metal alloy current collector, and preparation method and application thereof

A technology of porous metals and metal alloys, which is applied in the coating process of metal materials, lithium batteries, electrode carriers/collectors, etc., can solve the problems of unstable lithium-philic layer structure, non-conductive lithium products, large volume effect, etc., to achieve Improved Coulombic efficiency and cycle stability, uniform deposition/dissolution, and enhanced diffusion effects

Pending Publication Date: 2021-10-08
CENT SOUTH UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

[0004] Aiming at the problems of large volume effect, uncontrollable dendrites, unstable lithiophilic layer structure and non-conductive lithium product after reaction in the existing lithium metal negative electrode during the cycle process, the present invention provides a highly flexible 3D lithium-loving porous metal all...

Method used

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  • 3D lithium-philic composite porous metal alloy current collector, and preparation method and application thereof
  • 3D lithium-philic composite porous metal alloy current collector, and preparation method and application thereof
  • 3D lithium-philic composite porous metal alloy current collector, and preparation method and application thereof

Examples

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Effect test

Embodiment 1

[0047] Phosphorus copper mesh (Cu-Sn alloy) with a metal alloy fiber diameter of 5 μm, a porosity of 50%, a thickness of 60 μm, and a mass of 0.6 g was added to a mixture of 3M NaOH solution and 0.5 mmol / L ammonium persulfate solution. The solution was reacted at room temperature for 45min, cleaned and dried, placed in a tube furnace with an argon flow downwind direction, 3g of sodium hypophosphite was placed in the upwind direction, heated to 300°C at a rate of 2°C / min, and the air flow was 150ml Phosphate for 2h under argon flow / min.

[0048] The experimental results found that the metal fibers of the prepared materials were uniformly coated with a layer of Cu. 3 P-Sn 3 P 2 Nanolayers and their surface nanowires, Cu 3 P-Sn 3 P 2 The thickness of the nanolayer is 100 nm, Cu 3 P-Sn 3 P 2 The length of the nanowires is 8 μm, Cu 3 P-Sn 3 P 2 The content is 40wt.%.

Embodiment 2

[0050] A brass mesh (Cu-Zn alloy) with a metal alloy fiber diameter of 10 μm, a porosity of 60%, a thickness of 120 μm, and a mass of 1.0 g was added to a mixed solution composed of 4M NaOH solution and 1.0 mmol / L hydrogen peroxide solution. Reaction at room temperature for 90min, cleaned and dried, placed in a tube furnace in the downwind direction of argon flow, placed 4g of sodium hypophosphite in the upwind direction, heated to 400°C at a rate of 2°C / min, and heated to 400°C at a rate of 2°C / min. Phosphate for 3h.

[0051] The experimental results found that the metal fibers of the prepared materials were uniformly coated with a layer of Cu. 3 P-Zn 3 P 2 Nanolayers and their surface nanowires, Cu 3 P-Ti 3 P 2 The thickness of the nanolayer is 150 nm, Cu 3 P-Ti 3 P 2 The length of the nanowires is 8 μm, Cu 3 P-Ti 3 P 2 The content is 60wt.%.

Embodiment 3

[0053] A silver-copper mesh (Cu-Ag alloy) with a metal alloy fiber diameter of 30 μm, a porosity of 50%, a thickness of 200 μm, and a mass of 2.5 g was added to 5M NaOH solution and 3.0 mmol / L potassium permanganate solution. The mixed solution was reacted at room temperature for 90min, cleaned and dried, placed in a tube furnace with an argon flow downwind direction, 10g of sodium hypophosphite was placed in the upwind direction, heated to 500°C at a rate of 5°C / min, and heated to 500°C at a rate of 5°C / min. Phosphate under argon flow for 4h.

[0054] The experimental results found that the metal fibers of the prepared materials were uniformly coated with a layer of Cu. 3 P-Ag 3 P nanolayers and their surface nanowires, Cu 3 P-Ag 3 P 2 The thickness of the nanolayer is 180 nm, Cu 3 P-Ag 3 P 2 The length of the nanowire is 12 μm, Cu 3 P-Ag 3 P 2 The content is 80wt.%.

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Abstract

The invention belongs to the field of lithium metal battery negative electrode materials, and particularly discloses a high-flexibility 3D lithium-philic composite porous metal alloy current collector. The current collector comprises a high-flexibility 3D porous metal alloy current collector and a lithium-philic phosphide compounded on the 3D porous metal alloy current collector in situ, has abundant specific surface area, pore structure and excellent mechanical property, and can effectively reduce the local current density, promote the diffusion of electrons/lithium ions and inhibit the volume change; and a phosphide layer on the porous metal alloy current collector and a nanowire structure on the surface of the phosphide layer remarkably reduce lithium nucleation overpotential and induce lithium to be uniformly deposited/dissolved, the constructed lithium metal negative electrode can have excellent electrochemical performance, and coulombic efficiency and cycling stability are greatly improved. The invention further discloses a preparation method and application of the high-flexibility 3D lithium-philic composite porous metal alloy current collector.

Description

technical field [0001] The invention belongs to the technical field of lithium metal battery electrode materials, and particularly relates to an alloy current collector of a lithium metal battery and a preparation method and application thereof. Background technique [0002] Lithium metal has extremely high mass specific energy and is the most important anode material for secondary high specific energy energy storage devices. However, the uncontrollable lithium dendrite greatly reduces the coulombic efficiency of the battery and increases the potential safety risk, so it is difficult to be commercialized. The generation of Li dendrites is ultimately due to the framework-free nature of Li metal and the surface inhomogeneity, resulting in huge volume changes and non-uniform Li deposition. [0003] In order to solve these problems, the volume change during repeated charge and discharge processes is currently alleviated by 3D framework structures, such as Zhiguang Peng et al. [...

Claims

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Application Information

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IPC IPC(8): H01M4/66H01M4/134H01M10/052C23C18/04C23C18/12
CPCH01M4/662H01M4/667H01M4/134H01M10/052C23C18/1204C23C18/04H01M2004/021H01M2004/027Y02E60/10
Inventor 洪波赖延清姜怀赖俊全张治安张凯方静
Owner CENT SOUTH UNIV
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