Vacuum synthesis method of lithium-aluminum alloy

A technology of lithium aluminum alloy and synthesis method, which is applied in the direction of electrical components, circuits, battery electrodes, etc., can solve problems such as low primary yield, low primary yield, and difficulties, and achieve improved production efficiency, reduced alloying time, and reduced The effect of production costs

Active Publication Date: 2014-09-24
TIANQI LITHIUM CORP
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

However, when the lithium aluminum alloy obtained by the above CN103290293A method is pressed to prepare alloy strips, the primary yield is low, especially when preparing high-end ultra-thin alloy strips with a thickness of 40 μm or less, the primary yield is even lower. around 25%
The low primary yield makes it difficult to apply it to lithium battery materials

Method used

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  • Vacuum synthesis method of lithium-aluminum alloy
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  • Vacuum synthesis method of lithium-aluminum alloy

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preparation example Construction

[0023] The vacuum synthesis method of lithium aluminum alloy of the present invention comprises the following steps: mixing aluminum and molten metal lithium in a vacuum environment at a weight ratio of 1:24 to 999, then melting at 190 to 250°C and cooling to obtain lithium aluminum alloy.

[0024] Among them, aluminum can be single-state metal aluminum such as aluminum block, aluminum sheet, aluminum skin, aluminum wire, etc., and its aluminum content is required to be no less than 99wt%, or it can be an aluminum-lithium alloy block with a relatively high aluminum content, of which aluminum The content is 4-99wt%.

[0025] Further, in order to reduce the nitrogen content of the product, simplify production, and reduce costs, the vacuum environment has a vacuum degree of ≤0.1Pa.

[0026] Further, the above-mentioned method of melting metal lithium is to be melted by means of electricity or thermal oil heating under the atmosphere of a drying room with a dew point lower than -...

Embodiment 1

[0035] Under the atmosphere of a drying room with a dew point of -35°C, metal lithium is melted by electric heating, the heating rate is controlled at 200°C / h, and the temperature after melting is controlled at 210°C for use; The vacuum degree is stably lowered below 0.1 Pa, and the above-mentioned molten metal lithium is added to the reaction kettle, and at the same time, aluminum with an aluminum content of 99.5wt% is added, wherein the weight ratio of lithium to aluminum is 665.7:1, and then the reaction kettle The temperature of the alloy liquid is controlled at 220°C, and the melting time is 30 minutes. After the alloying is completed, it is lowered to 200°C and cast. After the casting is completed and the temperature of the alloy ingot reaches the ambient temperature, the mold is opened for demoulding and sampling. The samples taken out are quickly packaged, weighed and recorded. The composition of the obtained lithium aluminum alloy is shown in Table 1.

[0036] Tabl...

Embodiment 2

[0039] Under the atmosphere of a drying room with a dew point of -35°C, metal lithium is melted by electric heating, the heating rate is controlled at 200°C / h, and the temperature after melting is controlled at 210°C for use; The vacuum degree is stably lowered to below 0.1 Pa, and the above-mentioned molten metal lithium is added to the reaction kettle, and aluminum is added at the same time, wherein, the temperature of the alloy liquid in the reaction kettle is controlled at 190-250°C, and the melting time is 20-50min. After the alloying is completed, lower the temperature to 185-230°C and perform casting. After the casting is completed and the temperature of the alloy ingot reaches the ambient temperature, the tank is opened for demoulding and sampling. The samples taken out are quickly packaged, weighed and recorded. Wherein, the weight ratio of lithium to aluminum and various parameters are shown in Table 2, and the composition of the obtained lithium aluminum alloy is s...

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Abstract

The invention relates to a vacuum synthesis method of lithium-aluminum alloy, belongs to the fields of non-ferrous metallurgy and batteries, and aims at solving the technical problem of providing a vacuum synthesis method of a lithium-aluminum alloy. The vacuum synthesis method of the lithium-aluminum alloy disclosed by the invention comprises the following steps: evenly mixing aluminum with molten metal lithium in a vacuum environment at a weight ratio of 1:(24-999), then smelting at 190-250 DEG C, and cooling, so as to obtain the lithium-aluminum alloy. Furthermore, the invention also discloses the lithium-aluminum alloy prepared by the method disclosed by the invention and use thereof in preparation of a battery cathode material. By adopting the vacuum synthesis method of the lithium-aluminum alloy disclosed by the invention, the alloying time is greatly reduced, the production efficiency is obviously improved, meanwhile, the impurity nitrogen content is obviously reduced, the product quality of the lithium-aluminum alloy is improved, and preparation of a high-end ultra-thin metal belt is facilitated.

Description

technical field [0001] The invention relates to a vacuum synthesis method of lithium aluminum alloy, which belongs to the field of nonferrous metallurgy and batteries. Background technique [0002] Lithium metal is a silver-white light metal with light texture, good ductility, strong electrical conductivity, and excellent electrochemical performance. Its theoretical capacity is as high as 3860Ah / kg. It is one of the most suitable materials for secondary battery anode materials. Therefore, in the 1970s and 1980s, there were reports of using metal lithium as the negative electrode of secondary batteries. For example, in 1972, the American Exxon company launched the Li / TiS 2 Secondary battery, the Canadian Moli company launched Li / MoS in the late 1980s 2 secondary battery. However, since metal lithium electrodes are prone to produce dendrites during the charge and discharge process, if the dendrites fall off from the plate, the electrical contact with the plate will be broke...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C22C24/00H01M4/40
CPCY02E60/10
Inventor 曹乃珍左永建邓玉松赵本常涂明江罗玉萍李仕红
Owner TIANQI LITHIUM CORP
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