A kind of lithium metal electrode and its preparation method and application

A lithium metal electrode, lithium ion battery technology, applied in negative electrodes, battery electrodes, active material electrodes, etc., can solve the problems of SEI film rupture, irreversible loss of battery capacity, and decreased cycle stability.

Active Publication Date: 2022-02-11
BEIJING UNIV OF TECH
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  • Abstract
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  • Claims
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Problems solved by technology

[0004] However, metal lithium batteries have serious dendrite growth problems. It is difficult to stabilize the cycle of lithium dendrite growth, which will lead to short circuit of the battery, which may cause thermal runaway, causing potential risk of fire and explosion. In addition, due to the uneven deposition of lithium metal, SEI The continuous rupture and formation of the film, during the cycle, the instability of the SEI film will further accelerate the formation of dendrites, forming "dead lithium", resulting in a decrease in cycle stability and increased safety issues; unlimited volume during cycle Changes, resulting in material internal stress changes and interface fluctuations, resulting in irreversible loss of battery capacity

Method used

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  • A kind of lithium metal electrode and its preparation method and application
  • A kind of lithium metal electrode and its preparation method and application

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preparation example Construction

[0038] The present invention also provides a preparation method of the lithium metal electrode described in the above technical solution, comprising the following steps:

[0039] Depositing Al on the surface of lithium flakes by atomic layer deposition 2 o 3 , get Al 2 o 3 layer;

[0040] In the Al 2 o 3 The surface of the layer is coated with a carbon nanotube dispersion to obtain a carbon nanotube layer;

[0041] Adopt atomic layer deposition method, deposit Li on the surface of described carbon nanotube layer 3 PO 4 layer to obtain the lithium metal electrode.

[0042]In the present invention, unless otherwise specified, all raw material components are commercially available products well known to those skilled in the art.

[0043] The present invention adopts the atomic layer deposition method to deposit Al on the surface of the lithium sheet 2 o 3 , get Al 2 o 3 layer. In the present invention, the deposited Al 2 o 3 The process is preferably as follows: i...

Embodiment 1

[0071] Place a lithium sheet with a thickness of 0.5mm in the vacuum reaction chamber of the glove box combined with atomic layer deposition equipment, and then seal the reaction chamber. The temperature of the vacuum reaction chamber is 150 ° C. The system pipeline, trimethylaluminum and The temperature of deionized water is room temperature;

[0072] Turn on the vacuum mechanical pump to evacuate the system pipeline and vacuum reaction chamber to less than 0.1Pa, feed trimethylaluminum for 0.2s, deposit for 0.5s, feed cleaning gas, and purge the residual gas and by-products after the reaction for 15s ;Introduce deionized water for 0.2s, deposit for 0.5s, inject cleaning gas, and purge the residual gas and by-products after the reaction for 15s; after cleaning, vacuumize until the pressure value of the vacuum reaction chamber and system pipeline is less than 0.1Pa , cycle the above operation 50 times to obtain Al with a thickness of 5nm 2 o 3 layer;

[0073] Mix 10 mg of c...

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Abstract

The invention relates to the technical field of electrode materials, in particular to a lithium metal electrode and its preparation method and application. The three-dimensional network structure in the lithium metal electrode provided by the present invention can effectively accelerate charge transfer and reduce interfacial resistance; compared with pure lithium electrodes, it has a large specific surface area, which can generate lower local current density and make the charge distribution Uniform, Li deposition will become smooth and reduce its growth rate, the Al 2 o 3 layer and Li 3 PO 4 The layer can accommodate the volume expansion during the battery cycle, reduce the preferential deposition of lithium ions, promote the uniform deposition on the surface of lithium metal, effectively suppress lithium dendrites, and improve the stability and cycle life of the battery; and the invention described The structural features of lithium metal electrodes can reduce the internal stress and interfacial fluctuations of the material, thereby improving the overall mechanical stability and integrity of the battery.

Description

technical field [0001] The invention relates to the technical field of electrode materials, in particular to a lithium metal electrode and its preparation method and application. Background technique [0002] Lithium-ion batteries are widely used in various fields such as camcorders, mobile phones, notebook computers and electric vehicles due to their high operating voltage, good cycle performance, high energy density and power density. However, with the increase in demand, traditional lithium-ion batteries are gradually unable to meet the needs, and there is an urgent need to develop electrode materials with high energy density and long service life to meet emerging high-end energy storage devices. [0003] Lithium metal anode is known as the "holy grail" electrode because of its extremely high theoretical capacity (3860mAh / g) and the most negative potential (-3.040Vvs standard hydrogen electrode), and has attracted great attention from researchers. [0004] However, metal...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): H01M4/134H01M4/62H01M4/38H01M4/1395H01M10/0525B82Y30/00B82Y40/00
CPCH01M4/134H01M4/1395H01M4/382H01M4/628H01M4/625H01M10/0525B82Y30/00B82Y40/00H01M2004/027Y02E60/10
Inventor 张跃飞曹天赐王明明程晓鹏雷丹
Owner BEIJING UNIV OF TECH
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