A kind of battery-grade lithium-aluminum alloy synthesis equipment and synthesis method

Abstract

The invention relates to a battery-grade lithium-aluminum alloy synthesis equipment and a synthesis method, in particular to a lithium-aluminum alloy synthesis equipment and a synthesis method dedicated to primary lithium battery negative electrode materials. Including melting tank, first heating furnace, pipeline filter, liquid seal valve, second heating furnace, synthesis kettle, third heating furnace, argon device, vacuum pump and control cabinet; first heating furnace is set outside the melting material tank ; A pipeline filter and a liquid seal valve are arranged between the melting material tank and the synthesis kettle, and a second heating furnace is arranged outside the pipeline filter and the liquid seal valve; a third heating furnace is provided outside the synthesis kettle; Both the tank and the synthesis kettle are connected with an external argon device and a vacuum pump; the melting tank, the synthesis kettle, the first heating furnace, the second heating furnace, the third heating furnace, the liquid seal valve, the argon device and the vacuum pump are connected to the control cabinet. The melting operation is carried out under fully enclosed vacuum conditions, and the impurities produced are removed, and the materials are combined in the synthesis kettle to complete the compound reaction, and the obtained battery-grade lithium aluminum alloy products are of good quality and stable.

Description

technical field [0001] The invention relates to a battery-grade lithium-aluminum alloy synthesis equipment and a synthesis method, in particular to a lithium-aluminum alloy synthesis equipment and a synthesis method dedicated to primary lithium battery negative electrode materials. Background technique [0002] In recent years, with the continuous development of the application field of primary lithium batteries, higher requirements have been put forward for primary lithium batteries in terms of electrical performance and safety. Practice has shown that primary lithium-iron batteries use battery-grade lithium-aluminum alloy as the negative electrode material, which can significantly improve their discharge voltage characteristics. The primary lithium-manganese battery uses battery-grade lithium-aluminum alloy material as the negative electrode, which can improve its safety performance during high-current discharge. Therefore, battery-grade lithium-aluminum alloys as anode m...

AI Technical Summary

Problems solved by technology

[0005] There are three main problems in the synthesis process of the above-mentioned battery-grade lithium-aluminum alloys: first, the synthesis equipment of lithium-aluminum alloys are all open mechanical stirring methods

When using the synthesis process in an air drying room, even if the relative humidity in the drying room is kept below 2% (20°C), since metal lithium is too active at a synthesis temperature of 200-220°C, it will more or less interact with oxygen, Nitrogen undergoes a chemical reaction to produce impurities; when the synthesis process in the argon glove box is used, due to operational requirements, the glove box cannot be completely sealed, and the outside natural air can easily enter the glove box to pollute the argon gas. A small amount of lithium oxide and lithium nitride impurities will also be produced during the synthesis of lithium aluminum alloys

The second is that the melting and synthesis of lithium aluminum alloy are carried out in the same equipment. The lithium oxide and lithium nitride impurities produced during the melting and synthesis of lithium aluminum alloy cannot be effectively removed and are brought into the product during casting.

Third, because the synthesis equipment is mechanically stirred, it is necessary to stop stirring during manual casting, which will affect the uniformity of aluminum content in the alloy

[0006] Therefore, the quality of battery-grade lithium aluminum alloy products synthesized by traditional process equipment is difficult to guarantee and the stability is poor

At the same time, due to the open mechanical stirring method of the equipment, there are great potential safety hazards

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