Non-Newtonian fluid Na-K alloy electrode and preparation method and application thereof

A non-Newtonian fluid and alloy electrode technology, which is applied in electrode manufacturing, battery electrodes, electrode collector coatings, etc., can solve problems such as changing the properties of liquid Na-K alloy fluids, and achieve improved energy density and cycle stability. Effect of High Coulombic Efficiency

Active Publication Date: 2019-01-18
ZHEJIANG UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, there is currently no research on changing the fluid properties of liquid Na-K alloys at home and abroad.

Method used

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  • Non-Newtonian fluid Na-K alloy electrode and preparation method and application thereof
  • Non-Newtonian fluid Na-K alloy electrode and preparation method and application thereof
  • Non-Newtonian fluid Na-K alloy electrode and preparation method and application thereof

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0037]Under the protection of inert gas argon, K metal and Na metal need to be cut to remove surface oxides before use, 0.1g K metal and 0.028g Na metal are stacked in a glove box, and after a period of reaction, a liquid Na-K alloy is formed. Mix 1 g of glucose with 500 mL of an aqueous solution containing 1% by mass of surfactant (sodium alkylbenzene sulfonate), then pour it into a hydrothermal tank, heat it at 180° C. for 12 hours, and wash to obtain carbon nanospheres. Mix 0.128g of liquid Na-K alloy with 0.5g of nano-carbon spheres, and continue to stir until a viscous mixture is formed to form a non-Newtonian fluid Na-K alloy (ie, a non-Newtonian fluid Na-K alloy composite material), and then coat A non-Newtonian fluid state Na-K alloy coating is formed on the surface of the copper sheet to prepare a non-Newtonian fluid state Na-K alloy electrode.

[0038] The non-Newtonian fluid state Na-K alloy prepared in Example 1 is relatively viscous and can be coated. figure 1 A ...

Embodiment 2

[0040] Under the protection of inert gas argon, K metal and Na metal need to be cut to remove surface oxides before use, 0.2g K metal and 0.056g Na metal are stacked in a glove box, and after a period of reaction, a liquid Na-K alloy is formed. Mix 2.5g of copper dichloride dihydrate with 1000mL of an aqueous solution containing 1% by mass of surfactant (sodium alkylbenzene sulfonate), and then pour it into a hydrothermal tank, heat it at 160°C for 11 hours, and wash to obtain Copper oxide nanopowder. Mix 0.256g of liquid Na-K alloy with 0.2g of copper oxide nanopowder, and keep stirring until a viscous mixture is formed, that is, a non-Newtonian fluid Na-K alloy is formed, and then coated on the surface of carbon cloth to obtain a non-Newtonian flow Bulk Na-K alloy electrode.

[0041] The performance of the obtained electrode is similar to Example 1.

Embodiment 3

[0043] Under the protection of inert gas argon, K metal and Na metal need to be cut to remove surface oxides before use, 0.2g K metal and 0.056g Na metal are stacked in a glove box, and after a period of reaction, a liquid Na-K alloy is formed. Mix 1.8g of silicon oxide powder with 1000mL of an aqueous solution containing 1% by mass of surfactant (sodium alkylbenzene sulfonate) evenly, then pour it into a hydrothermal tank, heat it at 180°C for 12 hours, and wash to obtain silicon nanopowder . Mix 0.256g of liquid Na-K alloy with 0.4g of silicon nanopowder, and keep stirring until a viscous mixture is formed, that is, a non-Newtonian fluid state Na-K alloy is formed, and then coated on the surface of a plastic film to obtain a non-Newtonian fluid state Na-K alloy electrode.

[0044] The performance of the obtained electrode is similar to Example 1.

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Abstract

The invention discloses a non-Newtonian fluid state Na- K alloy electrode, and a preparation method and an application as an anode material of an alkali metal secondary battery thereof. That method comprise the steps of physically stacking K metal and Na metal under the protection of an inert gas, alloying the K metal and Na metal, and obtaining Na-K liquid alloy; Under the protection of inert gas, the liquid Na-K alloy and powder particles were mixed and stirred to form non-Newtonian fluid Na-K alloy composite material which is coated on the carrier to obtain non-Newtonian fluid Na-K alloy electrode. The electrode comprises a carrier coated with a non-Newtonian fluid Na-K alloy composite. that electrode of the invention has the characteristic of high coulombic efficiency, no dendrite growth, stable structure and the like, the electrode can be used as a potassium metal negative electrode and a sodium metal negative electrode at the same time, and the energy density and cycle stabilityof the whole battery are remarkably improve when the electrode is matched with positive electrode materials such as sulfur, Prussian blue and the like.

Description

technical field [0001] The invention relates to the technical field of negative electrode materials for alkali metal secondary batteries, in particular to a non-Newtonian fluid state Na-K alloy electrode, a preparation method thereof and an application as negative electrode materials for alkali metal secondary batteries. Background technique [0002] With the development of technology and the popularization of electronic products, traditional batteries can no longer meet the demand. As a new type of energy storage device, alkali metal batteries have the characteristics of large reserves, low preparation cost, and wide electrochemical window, and have broad application prospects in the fields of mobile communications, electric vehicles, and energy storage. Compared with traditional carbon materials and metal oxides, alkali metal negative electrodes have higher specific capacity. However, alkali metal anodes are prone to produce dendrites, leading to short-circuit of the batt...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H01M4/40H01M4/1395H01M4/04H01M10/054
CPCH01M4/0404H01M4/1395H01M4/40H01M10/054Y02E60/10
Inventor 夏新辉章理远李玉倩王秀丽涂江平
Owner ZHEJIANG UNIV
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