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Preparation method of thin-layer metal lithium-based negative electrode

A metal lithium and negative electrode technology, which is applied in the field of preparation of thin-layer metal lithium-based negative electrodes, can solve the problems of puncturing the diaphragm, producing lithium dendrites, explosion, etc., and achieves the effect of uniform deposition, uniform deposition, and easier deposition.

Inactive Publication Date: 2018-05-22
WUHAN MARINE ELECTRIC PROPULSION RES INST CHINA SHIPBUILDING IND CORP NO 712 INST
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Problems solved by technology

[0004] Compared with the graphite negative electrode in the current lithium battery, the direct use of the metal lithium negative electrode can greatly reduce the thickness and reduce the mass and volume of the battery. However, the direct use of the lithium negative electrode for charging will generate lithium dendrites, which will puncture the diaphragm, cause a short circuit or even serious safety issues such as explosions

Method used

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  • Preparation method of thin-layer metal lithium-based negative electrode
  • Preparation method of thin-layer metal lithium-based negative electrode

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Embodiment 1

[0019] figure 1 Comparison of disassembled pictures after lithium electrodeposition on the surface of copper foil with / without graphene: (a) little and uneven white metal lithium deposition on the surface of copper foil without graphene; (b) white metal lithium deposition on the surface of graphene / copper foil Large and even.

[0020] figure 2 Comparison of voltage curves during lithium electrodeposition on the surface of copper foil with / without graphene: the voltage curve of graphene / copper foil rises more smoothly and stably, and has a lower overpotential, indicating that electrodeposited lithium is more uniform and stable

[0021] Cut the copper foil into a suitable size and put it into a quartz tube, heat it up to around 1000°C with a tube furnace in a mixed atmosphere of argon and hydrogen, then feed methane gas to grow graphene, and turn off the methane gas after 30 minutes. Start to cool down to obtain copper foil with graphene film.

[0022] Then assemble the ele...

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Abstract

The invention relates to the technical field of a modern battery, in particular to a preparation method of a thin-layer lithium-based negative electrode. A negative electrode takes a copper foil current collector as a substrate, a single-layer graphene thin film is synthesized on a surface of the copper foil current collector by a chemical vapor deposition method, graphene / copper used as the negative electrode and a lithium-rich material or a lithium salt of a lithium source used as a positive electrode are assembled to form an electrolytic tank, an electrolyte is injected, the electrolytic tank is sealed, electro-deposition with relatively low current density is performed, the electrolytic tank is disassembled after appropriate reaction time, and the lithium-based negative electrode plated with uniform thin-layer metal lithium can be obtained at a negative electrode part. With the adoption of the method disclosed by the invention, uniform deposition of metal lithium can be achieved, meanwhile, the problem that a large amount of lithium dendrites are generated caused by direct deposition on a surface of the copper current collector is solved, so that a lithium negative electrode material with more safety and stability is obtained and is applied to a lithium primary battery and a lithium secondary battery.

Description

technical field [0001] The invention belongs to the field of lithium batteries, and in particular relates to a method for preparing a thin-layer metal lithium-based negative electrode. Background technique [0002] With the advancement and development of science and technology in recent years, a series of high-tech electronic products such as smartphones and smart wearable devices have greatly facilitated people's production and life. choose. Therefore, higher objective requirements are also put forward for the battery which undertakes the role of energy supply. [0003] Traditional lead-acid batteries, manganese-zinc batteries, etc. are no longer suitable for these small or high-power electrical equipment due to their limited capacity and huge mass and volume, and have been replaced by the rise of high-specific-energy lithium batteries. However, the objective demand for miniaturization and light weight of equipment in the market also promotes the continuous improvement of...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H01M4/1395H01M4/08H01M4/04H01M10/052H01M6/14
CPCH01M4/0452H01M4/08H01M4/1395H01M6/14H01M10/052Y02E60/10
Inventor 吴睿哲程冰冰李正陈大鹏田文增
Owner WUHAN MARINE ELECTRIC PROPULSION RES INST CHINA SHIPBUILDING IND CORP NO 712 INST
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