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Method for making lithium aluminide compound with high lithium content

a lithium aluminide and compound technology, applied in the direction of electrolysis process, electrolysis components, etc., can solve the problems of insufficient lithium aluminide compound preparation, limited application of lithium aluminide compound, high energy consumption and time of ball grinding method, etc., to achieve the effect of reducing the danger of conventional processes and the cost of storage and transportation

Inactive Publication Date: 2009-01-01
UAN JUN YEN +1
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Benefits of technology

[0008]A method for making lithium aluminide compound with high lithium content in accordance with the present invention satisfies the need to lower the danger of conventional processes and the cost of storing and transporting the solid lithium.
[0009]The method comprises providing an electrolytic bath that employs an aluminum material as cathode. The electrolytic bath fills an electrolyte that essentially consists of lithium chloride, potassium chloride, and calcium chloride. The lithium chloride of the electrolyte provides a lithium source for making lithium aluminide compound, and the potassium chloride is a flux to decrease the temperature and improve the fluidity of the electrolyte.
[0012]In conclusion, the embodiment of the present invention provides a method to prepare lithium aluminide compound with high lithium content. The method includes applying an aluminum cathode and an electrolyte with lithium chloride, a stable chemical in atmospheric environment, to perform a diffusive electrolysis. The lithium is increasingly reduced and deposited on the aluminum cathode in diffusive electrolysis to form the liquid lithium aluminide, and solidify to a lithiumaluminide compound with high lithium content. The embodiment of the present invention provides a safer, lower cost and more convenient way to transport and store the lithium material by employing the lithium chloride as the raw material of the lithium aluminide compound.

Problems solved by technology

The application of the lithium aluminide compound is limited because the ingredients of the lithium aluminide (AlLi) compound are difficult to control.
The ball-grinding method consumes a lot of energy resources and time to force the metal powder blend into the lithium granule by mechanical metallurgy.
In the case of manufacturing the lithium aluminide compound, both the aluminum powder and solid lithium are extremely unstable in air, so that the ball grinding process is not adequate for the preparation of the lithium aluminide compound.
The above process gets even more complicated with increasing lithium content in the aluminum alloy melt.
Moreover, solid lithium is extremely unstable in air because the air humidity may result in dangerous flash lithium gasification.
Solid lithium is very dangerous during the transportation and storage period, and the cost cannot be lowered in regions without lithium ore that relies on importing the lithium from the place of origin.
Therefore, the conventional process of preparing a lithium containing alloy is not only difficult to operate but also expensive.

Method used

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  • Method for making lithium aluminide compound with high lithium content
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  • Method for making lithium aluminide compound with high lithium content

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Embodiment Construction

[0018]Reference will now be made in detail to the present embodiments of the invention, examples of which are illustrated in the accompanying drawings. Wherever possible, the same reference numbers are used in the drawings and the description to refer to the same or like parts.

[0019]Refer to FIG. 1. FIG. 1 is a flowchart of steps in accordance with an embodiment of the present invention. The steps of the embodiment include providing an electrolytic bath with an electrolyte and the temperature of the electrolyte is kept within a range of 380° C.˜550° C.; and exerting an electric current with current density of 0.08 A˜0.1 A per unit area of cathode surface (cm2) to the electrolyte to perform a diffusive electrolysis. The lithium ions of the electrolyte are reduced into lithium atoms and diffused into the aluminum cathode. The lithium content of the aluminum cathode is increased with diffusive electrolysis and forms liquid lithium aluminide floated on the upper of the electrolyte. Fina...

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Abstract

A method for making lithium aluminide compound with high lithium content is disclosed. The method includes applying an electrolyte composed of lithium chloride, potassium chloride, and calcium chloride to accomplish a diffusive electrolysis under 380˜550° C. temperature. The lithium atoms of the electrolyte are reduced and diffused into an aluminum cathode, and liquid lithium aluminide is formed and floats on the electrolyte. The liquid lithium aluminide is further scooped up from the upper electrolyte and solidified to a lithium aluminide compound with 40˜62 wt % lithium content.

Description

RELATED APPLICATIONS[0001]The application claims priority to Taiwan Application Serial Number 96123839, filed Jun. 29, 2007, which is herein incorporated by reference.BACKGROUND[0002]1. Field of Invention[0003]The present invention relates to a method for making lithium aluminide (AlLi) compound. More particularly, the present invention relates to a method for making lithium aluminide compound with high lithium content.[0004]2. Description of Related Art[0005]The application of the lithium aluminide compound is limited because the ingredients of the lithium aluminide (AlLi) compound are difficult to control. Conventionally, the intermetallic FeLi compound or intermetallic CuLi compound is prepared by a ball-grinding method in a chamber with a protective gaseous environment. The ball-grinding method consumes a lot of energy resources and time to force the metal powder blend into the lithium granule by mechanical metallurgy. In the case of manufacturing the lithium aluminide compound,...

Claims

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Application Information

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IPC IPC(8): C25B1/14
CPCC25C3/02C25C3/00
Inventor UAN, JUN-YENTSAI, TE-CHANG
Owner UAN JUN YEN
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