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Negative current collector of sodium ion battery, preparation method of negative current collector and sodium ion battery

A technology for sodium ion batteries and current collectors, applied in the direction of electrode carriers/current collectors, battery electrodes, negative electrodes, etc., can solve the problems of reducing local current density, low cycle efficiency of sodium ion batteries, and growth of sodium dendrites, etc. Local current density, inhibited growth, effect of promoting uniform distribution

Pending Publication Date: 2022-03-25
GUANGDONG UNIV OF TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

[0005] In view of this, the present application provides a negative electrode current collector of a sodium ion battery and a preparation method thereof and a sodium ion battery, by improving the surface structure of the negative electrode current collector of the sodium ion battery, reducing the local current of the aluminum-based current collector of the negative electrode of the sodium ion battery Density, thereby solving the technical problem of low cycle efficiency of sodium ion batteries caused by sodium dendrite growth and volume expansion in the negative electrode of sodium ion batteries in the prior art during repeated cycles

Method used

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  • Negative current collector of sodium ion battery, preparation method of negative current collector and sodium ion battery
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  • Negative current collector of sodium ion battery, preparation method of negative current collector and sodium ion battery

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Embodiment 1

[0034] This embodiment 1 provides the first preparation method of the negative electrode collector of the sodium ion battery, including the following steps: accurately weigh 0.01mmol potassium hydroxide, add it to 10mL glycerol, and stir it magnetically at a speed of 500r / min for 1 hours, take 50 μL of the solution and drop it on an aluminum foil with a diameter of 12 mm, react at 25°C for 8 hours, wash the surface of the aluminum foil three times alternately with deionized water and absolute ethanol, and dry it at 25°C to obtain a negative electrode for a sodium-ion battery current collector.

Embodiment 2

[0036] This embodiment 2 provides the second preparation method of the negative electrode current collector of the sodium ion battery, which includes the following steps: accurately weigh 0.01 mmol of nickel hydroxide, add it to 10 mL of ethylenediamine, and stir it magnetically for 5 at a speed of 200 r / min. hour, take 50 μL of the solution and drop it on an aluminum foil with a diameter of 12 mm, react at 80°C for 4 hours, wash the surface of the aluminum foil with deionized water and absolute ethanol alternately for 3 times, and dry it at 80°C to obtain the negative electrode of the sodium ion battery current collector.

Embodiment 3

[0038] This embodiment 3 provides the third preparation method of the negative electrode current collector of the sodium ion battery, which includes the following steps: accurately weigh 0.2mmol calcium hydroxide, add it to 10mL glycerol, and stir it magnetically for 5 minutes at a speed of 1000r / min. hour, take 200 μL of the solution and drop it on an aluminum foil with a diameter of 12 mm, react at 60°C for 5 hours, wash the surface of the aluminum foil with deionized water and absolute ethanol alternately for 3 times, and dry it at 50°C to obtain the negative electrode of the sodium ion battery current collector.

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Abstract

The invention belongs to the technical field of sodium-ion batteries, and particularly relates to a sodium-ion battery negative electrode current collector, a preparation method thereof and a sodium-ion battery. The sodium ion battery negative electrode current collector comprises an aluminum foil, the surface of the aluminum foil is provided with a nanosheet array, and compared with a conventional aluminum foil, the aluminum foil with the surface provided with the nanosheet array is large in specific surface area, so that the contact area between a negative electrode and electrolyte is increased, the local current density of the sodium ion battery negative electrode is reduced, and uniform distribution of sodium ion flux is promoted; the growth of sodium dendrites is inhibited, and the technical problem of low cycle efficiency of the sodium-ion battery caused by sodium dendrite growth and volume expansion in the repeated cycle process of the sodium-ion battery negative electrode in the prior art is solved.

Description

technical field [0001] The present application belongs to the technical field of sodium ion batteries, and in particular relates to a negative electrode current collector of a sodium ion battery, a preparation method thereof, and a sodium ion battery. Background technique [0002] Lithium-ion batteries have become ideal energy storage devices because of their advantages such as high working voltage platform, good rate performance, long service life, high energy storage density, and low self-discharge rate. However, lithium-ion batteries have a shortage of lithium resources, There are inevitable problems such as uneven distribution and high cost, and there are certain security risks. [0003] Compared with lithium, the sodium element of the same main group not only has similar physical and chemical properties to lithium, but also has thousands of times more resources in the earth's crust than lithium. Compared with lithium-ion batteries, it has the advantages of abundant reso...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H01M4/66H01M4/72H01M10/054
CPCH01M4/661H01M4/72H01M10/054H01M2004/027Y02E60/10
Inventor 芮先宏唐芳
Owner GUANGDONG UNIV OF TECH
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