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3D porous zinc-loaded current collector, sodium or potassium-philic battery negative electrode and preparation and application thereof

A porous current collector and battery negative electrode technology, which is applied in battery electrodes, electrode carriers/current collectors, secondary batteries, etc., can solve the problem of poor wettability of metal sodium and metal potassium, uneven deposition of sodium/potassium, and poor cycle performance of batteries And other issues

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

[0006] Aiming at the common technical deficiencies of 3D porous current collectors, such as poor wettability to metal sodium and metal potassium, uneven deposition of sodium / potassium, and poor cycle performance of the battery, the first purpose of the present invention is to provide a sodium- or potassium-friendly 3D porous zinc-loaded current collector (the present invention is also referred to as a composite zinc porous current collector, or simply referred to as a natriophilic or potassium current collector)

Method used

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  • 3D porous zinc-loaded current collector, sodium or potassium-philic battery negative electrode and preparation and application thereof
  • 3D porous zinc-loaded current collector, sodium or potassium-philic battery negative electrode and preparation and application thereof
  • 3D porous zinc-loaded current collector, sodium or potassium-philic battery negative electrode and preparation and application thereof

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0082] Clean nickel foam (Ni foam) (the thickness of the nickel foam current collector is 60 μm, the porosity is 60%, and the hole spacing is 120 μm) is placed in the following electroplating solution for zinc deposition.

[0083] The electroplating solution is an aqueous solution of zinc chloride, hydrochloric acid, and sodium lauryl sulfate, wherein 25 g / L of zinc chloride, 30 g / L of hydrochloric acid, 0.1 g / L of sodium lauryl sulfate, and the balance of water.

[0084] Electrodeposition with Ni foam as the working electrode, zinc plate as the counter electrode, at 8mA / cm 2 Deposit for 100 s to obtain zinc-coated nickel foam in the framework (marked as Zn@Ni foam) (the particle size of Zn is 100nm). Then the prepared Zn@Ni foam was used as the working electrode, the sodium sheet was used as the counter electrode, and 1M CF 3 SO 3 Na / DGDE (diethylene glycol dimethyl ether) was used as the electrolyte for re-discharge cycle tests.

[0085] The prepared Zn@Ni foam was used a...

Embodiment 2

[0088] Clean carbon nanotube paper (CNT paper) (the carbon nanotube paper current collector has a thickness of 30 μm, a porosity of 60%, and a pore spacing of 0.5 μm) is placed in the following electroplating solution for zinc deposition.

[0089] The electroplating solution is an aqueous solution of zinc acetate, acetic acid, and cetyltrimethylammonium bromide, wherein, zinc acetate 35g / L, acetic acid 50g / L, cetyltrimethylammonium bromide 0.2g / L, water margin.

[0090] Electrodeposition with CNT paper as the working electrode, zinc plate as the counter electrode, at 12mA / cm 2 Down deposition 60s, the carbon nanotube paper (marked as Zn@CNT paper) (the particle size of Zn is 20nm) ( Figure 4 ).

[0091] Then the prepared Zn@CNT paper was used as the working electrode, the sodium sheet was used as the counter electrode, and 1M CF 3 SO 3 Na / DGDE (diethylene glycol dimethyl ether) was used as the electrolyte for re-discharge cycle tests.

[0092] The prepared Zn@CNT paper w...

Embodiment 3

[0095] The Zn@CNT paper obtained in Example 2 is used as a working electrode, and then at a current density of 1mA / cm2, metal sodium of 5mAh / cm2 is deposited on the Zn@CNT paper working electrode to prepare a Na-Zn@CNT paper composite negative electrode material, Then form a sodium-sulfur battery with S-rich graphene cathode, at 1M CF 3 SO 3 In the electrolyte of Na / DGDE, the charge-discharge cycle test was carried out at 0.5C.

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Abstract

The invention belongs to the field of an electrode material and particularly belongs to the field of sodium electricity and potassium electricity. The invention discloses a 3D porous zinc-loaded current collector. The 3D porous zinc-loaded current collector comprises a 3D porous current collector and metal zinc compounded on a framework of the 3D porous current collector, the invention further comprises a preparation method and an application of the 3D porous zinc-loaded current collector, in addition, the invention further provides a sodium negative electrode or a potassium negative electrodeprepared from the 3D porous zinc-loaded current collector. The 3D porous zinc-loaded current collector is advantaged in that the metal zinc is creatively compounded on a pore skeleton of the 3D porous current collector, and the current collector with the structure can effectively maintain the skeleton stability in the sodium or potassium metal deposition process, moreover, the metallic zinc uniformly distributed on the pore skeleton can induce nucleation of metallic sodium or potassium, so the effective specific surface area of the 3D current collector is fully utilized in the sodium or potassium deposition process, and dendritic-crystal-free sodium or potassium deposition and long cycle life are realized.

Description

technical field [0001] The invention belongs to the field of energy storage devices, and in particular relates to a natriophilic and kalophilic 3D current collector and a negative electrode prepared therefrom. Background technique [0002] As an energy storage device, lithium-ion batteries have been widely used in various digital electronic products due to their high energy density and long cycle life. In recent years, lithium-ion batteries have gradually been applied in fields such as electric vehicles and smart grids. However, due to limited lithium resources (abundance in the earth's crust: 0.002%), the prices of lithium-ion batteries and related products remain high. Therefore, the development of low-cost energy storage devices is imminent. In this context, sodium and potassium are widely used due to their high abundance (2.83% for sodium and 2.59% for potassium), which are 1415 and 1295 times the abundance of lithium resources, respectively. focus on. In Na-ion batt...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H01M4/66H01M4/80H01M4/134H01M4/1395H01M4/36H01M4/38H01M4/62H01M10/054
CPCH01M4/134H01M4/1395H01M4/366H01M4/381H01M4/628H01M4/661H01M4/663H01M4/667H01M4/808H01M10/054Y02E60/10
Inventor 洪波赖延清范海林高春晖董庆元张治安张凯方静
Owner CENT SOUTH UNIV
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