Preparation device and method for metal lithium alloy negative electrode

A technology for preparing devices and metal lithium, which is applied in the direction of negative electrodes, metal material coating processes, battery electrodes, etc., can solve problems such as high equipment and process requirements, shortened battery life, and inapplicability to large-scale industrial applications. Achieve the effects of simplifying the production process, avoiding the formation of lithium dendrites, and improving battery safety

Active Publication Date: 2020-09-29
SICHUAN PANOVASIC TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, there are still many problems in the large-scale application of metal lithium anodes: 1. During the charging and discharging process, because of the high activity of metal lithium anodes and the uneven deposition of lithium ions, lithium dendrites are easily grown on the surface, which stimulates The short circuit caused by the penetration of the separator will cause thermal runaway, which will cause serious safety accidents. At the same time, the "dead lithium" formed after dendrite fracture will reduce the Coulombic efficiency. Instability of the structure leads to pulverization of the material, which shortens the service life of the battery
[0005] At present, there are two preparation techniques for composite metal lithium alloy negative electrodes: 1. It is carried out by melting, ingot casting, cooling and rolling, which has the disadvantages of complicated production process and high energy c

Method used

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  • Preparation device and method for metal lithium alloy negative electrode
  • Preparation device and method for metal lithium alloy negative electrode
  • Preparation device and method for metal lithium alloy negative electrode

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Embodiment 1

[0029] The present invention provides a preparation device for lithium metal composite negative electrode, the device includes a heating container 4, a roller machine and a nitrogen reaction container 12, the heating container is an induction furnace 4, and a crucible is arranged inside the induction furnace 4. The inside of the heating container 4 is provided with a graphite electrode 3, and the graphite electrode 3 and the heating container 4 are respectively connected with an external power supply 1 through a wire 2; the heating container 4 is connected with the roller machine through a pipeline 5, and the pipeline 5 One end near the roll machine is provided with a valve 13, and the roll machine includes a continuous casting roll 7 and a multi-stage roll, and the multi-stage roll includes a first roll 8, a second roll 9, a third roll 10 and a fourth roll 11, the A nitrogen reaction vessel 12 is provided at the end of the roll mill. The device also comprises a platform 6 on ...

Embodiment 2

[0031] Add metal lithium ingot, metal aluminum and metal magnesium into the induction furnace at a mass ratio of 8:1:1, heat the lithium ingot to a molten state at 700°C, and apply a voltage of 0.5V between the outer wall of the crucible and the graphite electrode to maintain the temperature and voltage for 4 hours, and carry out slag removal treatment at the same time; open the valve so that the lithium melt flows into the nip area of ​​the casting roll through the pipeline, and the gap in the nip area is 6mm; The temperature of the rolls in the first section is kept at 120°C, the temperature of the last three rolls is kept at 50°C, and the gap between the upper and lower two rolls is: the first section: 3mm, the second section: 0.75mm; the third section: 0.3mm; Four sections: 0.1mm; put the composite lithium metal strip into a container filled with nitrogen after coming out of the fourth section roll, make the composite lithium metal strip react with nitrogen, wind up the com...

Embodiment 3

[0033] Add metal lithium ingot, metal boron and metal magnesium into the induction furnace according to the mass ratio of 7:2:1, heat to 400°C to make the lithium ingot into a molten state, and apply a voltage of 1.0V between the outer wall of the crucible and the graphite electrode to maintain the temperature and voltage for 3 hours, and carry out slag removal treatment at the same time; open the valve so that the lithium melt flows into the nip area of ​​the casting roll through the pipeline, and the gap in the nip area is 8mm; The temperature of the rolls in the first section is kept at 120°C, and the temperature of the last three rolls is kept at 60°C. The gap between the upper and lower rolls is: the first section: 4mm, the second section: 1.2mm; the third section: 0.3mm; Four sections: 0.1mm; put the composite lithium metal strip into a container filled with nitrogen after coming out of the fourth section roll, make the composite lithium metal strip react with nitrogen, w...

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Abstract

The invention discloses a preparation device and method for a metal lithium composite negative electrode. The device comprises a heating container, a roller machine and a nitrogen reaction container,wherein a graphite electrode is arranged inside the heating container, the graphite electrode and the heating container are correspondingly connected with an external power supply through wires, the heating container is connected with the roller machine through a pipeline, and the nitrogen reaction container is arranged at the tail end of the roller machine. Cycling performance of a composite metal lithium alloy negative electrode material prepared by the preparation device and method is remarkably improved, meanwhile, generation of lithium dendrites is inhibited, and the safety of a battery is greatly improved.

Description

technical field [0001] The invention relates to the technical field of lithium metal batteries, in particular to a preparation device and method for a lithium metal alloy negative electrode. Background technique [0002] With the continuous development of science and technology, the demand for high energy density power supply is getting higher and higher. At present, batteries that can theoretically provide high energy density include lithium-air batteries, lithium-sulfur batteries and lithium metal batteries, which are considered to be the most promising next-generation batteries. A generation of high specific energy batteries. Lithium metal anode is considered to be the most potential anode material because of its extremely high theoretical specific capacity (3860mAh·g-1) and extremely negative potential (-3.040Vvs standard hydrogen electrode). However, there are still many problems in the large-scale application of metal lithium anodes: 1. During the charging and dischar...

Claims

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Application Information

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IPC IPC(8): B22D11/06C23C8/24C22F1/16H01M4/134H01M4/139H01M4/40H01M10/052
CPCB22D11/0628C23C8/24C22F1/16B22D11/001H01M4/134H01M4/139H01M4/405H01M10/052H01M2004/027Y02E60/10
Inventor 高剑罗从山邓云龙王铭
Owner SICHUAN PANOVASIC TECH
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