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3D lithium-philic porous metal current collector, negative electrode, and preparation and application thereof

A technology of porous current collectors and porous metals, applied in battery electrodes, lithium batteries, electrode carriers/current collectors, etc., can solve the problems of insufficient current density reduction and inability to effectively suppress lithium dendrites.

Active Publication Date: 2020-02-21
CENT SOUTH UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0005] Aiming at the problems that the ubiquitous current density of 3D porous current collectors cannot be sufficiently reduced and lithium dendrites cannot be effectively suppressed, the present invention aims to provide a lithium-friendly 3D porous metal current collector (the present invention is also referred to as a 3D lithium-friendly porous metal collector). fluid, or simply referred to as Lithophilic current collector)

Method used

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  • 3D lithium-philic porous metal current collector, negative electrode, and preparation and application thereof
  • 3D lithium-philic porous metal current collector, negative electrode, and preparation and application thereof
  • 3D lithium-philic porous metal current collector, negative electrode, and preparation and application thereof

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0086] The thickness of the copper foam current collector is 50 μm, the porosity is 50%, and the hole spacing is 100 μm;

[0087] The copper foam current collector (Cu foam) is the working electrode, and Ag is the counter electrode, and silver particles are electrodeposited on the copper foam current collector (Cu foam) (the plating solution for electrodeposition is: sodium thiosulfate (200g / L), coke Potassium sulfite (40g / L), silver nitrate (30g / L), OP-10 (1mL / L) and the balance is water), at 1mA / cm 2 Ag@Cu foam was obtained by lower deposition for 10s; the particle size of Ag was ~500nm.

[0088] The prepared Ag@Cu foam was used as the working electrode, the metal lithium sheet was used as the counter electrode, and 1M LiTFSI / DOL:DME (volume ratio=1:1) contained 1%wt LiNO 3 Assemble coin cells for the electrolyte, conduct lithium deposition tests and charge-discharge cycle tests. At the same time, the corresponding deposition test and charge-discharge cycle test were carri...

Embodiment 2

[0092] The thickness of the titanium foam current collector is 20 μm, the porosity is 30%, and the pore spacing is 80 μm;

[0093] The porous titanium current collector (porous Ti) is the working electrode, platinum is the counter electrode, and the platinum particles are electrodeposited on the porous titanium (porous Ti) current collector (the plating solution for electrodeposition is: chloroplatinic acid hexahydrate (1.2g / L) , Tween 20 (0.6g / L) and the balance is water), at 1.5mA / cm 2 The Pt@porous Ti prepared by deposition for 20s. The particle size of Pt is 200 nm.

[0094] The prepared Pt@porous Ti was used as the working electrode, the metal lithium sheet was used as the counter electrode, and 1M LiTFSI / DOL:DME (volume ratio=1:1) contained 1%wt LiNO 3 Assemble coin cells for the electrolyte, conduct lithium deposition tests and charge-discharge cycle tests. At the same time, the corresponding deposition test and charge-discharge cycle test were carried out with pure ...

Embodiment 3

[0097] The thickness of the porous nickel-manganese current collector is 30 μm, the porosity is 45%, and the pore spacing is 70 μm;

[0098] The porous Ni-Mn current collector is used as the working electrode, and the Ag-Au alloy is used as the counter electrode. On the porous Ni-Mn current collector, Ag-Au particles are electrodeposited (the plating solution for electrodeposition is sulfur Sodium disulfate (180g / L), potassium metabisulfite (30g / L), silver nitrate (20g / L), chloroauric acid (1g / L), sodium dodecylbenzenesulfonate (0.3 / L) and The balance is water), at 1.5mA / cm 2 Ag-Au@porous Ni-Mn prepared by deposition for 30s; the particle size of Ag-Au particles is 100nm.

[0099] The prepared Ag-Au@porous Ni-Mn was used as the working electrode, the metal lithium sheet was used as the counter electrode, and 1MLiTFSI / DOL:DME (volume ratio=1:1) contained 1%wt LiNO 3 Assemble coin cells for the electrolyte, conduct lithium deposition tests and charge-discharge cycle tests. At...

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Abstract

The invention belongs to the field of a lithium battery electrode material and particularly discloses a 3D lithium-philic porous metal current collector. The current collector comprises a 3D porous metal current collector and at least one of gold, silver and platinum compounded on a framework of the 3D porous metal current collector. The invention further discloses a preparation method and an application of the metal current collector. A 3D lithium-philic porous lithium ion negative electrode is particularly prepared. The current collector is advantaged in that at least one metal of gold, silver and platinum on the porous metal framework reduces the overpotential in the lithium metal nucleation and deposition process, uniform deposition and dissolution of lithium metal in the continuous cycle process are realized, growth of dendrites is effectively avoided, and the cycle life of a lithium metal battery is greatly prolonged.

Description

technical field [0001] The invention belongs to the field of energy storage devices, and in particular relates to a lithium-friendly 3D current collector and a negative electrode prepared by using the current collector. Background technique [0002] Lithium-sulfur batteries are regarded as the most promising energy storage devices for the next generation due to their ultra-high energy density of 2600 Wh / kg. However, the growth of lithium dendrites and the huge volume effect limit its industrial application. To counter the risk of dendrites and mitigate volume effects. Currently, the most commonly used strategy is to support lithium metal in porous current collectors. For example, Shu-Hong Yu et al [L.L.Lu, J.Ge, J.N.Yang, S.M.Chen, H.B.Yao, F.Zhou, S.H.Yu, Free-standing coppernanowire network current collector for improving lithium anode performance, Nano Letters 16(2016 ) 4431-4437.] Prepared porous copper composed of copper nanofibers by self-assembly method, but when i...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H01M4/80H01M4/66H01M4/1395H01M4/134H01M10/052
CPCH01M4/80H01M4/661H01M4/134H01M4/1395H01M10/052Y02E60/10
Inventor 赖延清范海林洪波董庆元高春晖张治安张凯
Owner CENT SOUTH UNIV
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