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Current collector modification method, and modified current collector and application thereof

A current collector and modification technology, applied in the field of current collector modification research, can solve the problem of high cost of current collector modification, and achieve the effects of low cost of raw materials, long cycle life, and easy commercial promotion.

Active Publication Date: 2021-06-25
JIANGHAN UNIVERSITY
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0005] In order to solve the technical problem of high cost of current collector modification in the prior art, the present invention provides a method for modifying current collector, modified current collector and its application , the method is simple, the cost is low, and the modified current collector enables the lithium battery to have a long cycle life and low impedance performance

Method used

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  • Current collector modification method, and modified current collector and application thereof
  • Current collector modification method, and modified current collector and application thereof
  • Current collector modification method, and modified current collector and application thereof

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Embodiment approach

[0042] As an embodiment of the embodiment of the present invention, the alkali metal amino salt is any of the following: amino sodium, aminol.

[0043] In the present invention, in order to increase the efficiency of the reaction, the metal oxide can be mixed with an alkali metal amino salt after a mortar for 5-15 min to ablate.

[0044] S2, configure the metal nitride into suspension;

[0045] As an embodiment of the embodiment of the present invention, the suspension has a solid content of 10-30 mg · ml. -1 .

[0046] The addition of metal nitrides has a general meeting to make the dissolved dispersion process cannot obtain uniform suspension, which is easy to reunite, and the subsequent evaporation crystal process will also be uneven in the surface of the collector; the addition of metal nitrides is too small, so that the current fluid load The nitride content is less, and the subsequent performance test will result in a bad result.

[0047] As an embodiment of the embodiment o...

Embodiment 1

[0060] 1. Commercial triodoxide powder and flaky amino sodium (Nanh 2 Mass mole is grinded by 5 min in a mortar, placing the mixture in a porcelain and placed in a tubular furnace, protecting the gas nitrogen, and the temperature rise rate is 2 ° C · min -1 The holding temperature is 290 ° C, 3 hours.

[0061] 2, the tube furnace is lowered to the room temperature, take out the porcelain boat, and slowly add a small amount of deionized water with alcohol to fully react with excess aminometh, collect the product, deionized water is solvent. Three centrifugations, after alcohol was centrifuged twice, the rotational speed was 8000 rpm, the time was 3 min, and the iron nitride powder was obtained.

[0062] 3. Place the nitride powder obtained by step 2 into alcohol, configure the solid content of 10 mg ml -1 The suspension, and the suspension is subjected to a clean glass dish by ultrasound, and then pour the silicon nanoparticles into a clean glass dish, and the foam of the three pun...

Embodiment 2

[0065] 1, commercial iron oxide powder (Fe 3 O 4 ) With aminomide (linh 2 The mass rather than 1: 2 is grinded in a mortar for 15 min, and the mixture is placed in a porcelain-cavalu and placed in a tubular furnace, and the protective gas is argon, and the temperature rise rate is 10 ° C · min. -1 The holding temperature and time were 350 ° C, 6 hours.

[0066] 2. Tube-tube furnace is lowered to room temperature, take out the porcelain boat, slowly add a small amount of deionized water with alcohol, and collect the excess of excess aminol, collect the product, deionized water is a solvent. Three centrifugation, after the solvent was centrifuged with alcohol twice, the rotational speed was 10,000 rpm, the time was 5 min, and the iron nitride powder was obtained.

[0067] 3. Place the nitride powder at step 2 in N, N-dimethylformamide, configured to solidify the suspension of 30 mg / ml, and sufficiently adequately mixing the suspension through the ultrasound. After the dispersion o...

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Abstract

The invention provides a current collector modification method, and a modified current collector and application thereof. The method comprises the following steps: mixing metal oxide powder with alkali metal amino salt, conducting heating to 280-350 DEG C under the condition of protective gas, and carrying out heat preservation for 3-6 hours to implement a nitridation reaction so as to obtain metal nitride; preparing turbid liquid from the metal nitride; and placing a foam metal current collector into the turbid liquid, conducting heating to 50-80 DEG C under the condition of protective gas or vacuum used by the nitridation reaction, and keeping the temperature for 10-20 minutes so as to allow the nitride to be loaded on the foam metal, thereby finishing the modification of the current collector. According to the nitride modified current collector provided by the invention, in a coulombic efficiency test, cycle life is 155-280 circles, fitting impedance is 21-33 ohm after ten circles of circulation, cycle life is long, the impedance is low, and good performance is obtained; and meanwhile, a relatively long service life of 660-1000 h can be obtained in a symmetrical battery test.

Description

Technical field [0001] The present invention belongs to the technical field of collective fluid modification studies in lithium metal batteries, and in particular, the present invention relates to a combination fluid modification method, a modified current fluid and an application. Background technique [0002] The collector refers to the structure or part of the collection current, which mainly refers to a metal foil, such as a copper foil, an aluminum foil, or a foam metal such as foam, foam nickel and foam, and the collector as an ion. The foil used in the battery is modified to improve the performance of the lithium battery, so it is expected to help the lithium metal battery boom and have business prospects. Therefore, in recent years, it has been widely concerned by constructing a three-dimensional host structure to suppress dendrites. However, the three-dimensional metal host structure is still facing problems such as uneven lithium deposition and dendrite growth due to po...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H01M4/04H01M4/66H01M4/80H01M10/052H01M10/42
CPCH01M4/667H01M4/661H01M4/808H01M4/0416H01M4/0471H01M10/052H01M10/4235Y02E60/10
Inventor 梁济元郭驰张望
Owner JIANGHAN UNIVERSITY
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