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Composite metal lithium cathode with lithium-carbon composite interface layer and preparation method thereof

A composite metal, interface layer technology, applied in battery electrodes, electrical components, electrochemical generators, etc., can solve the problems of miscellaneous, dangerous, matching, etc., and achieve the effects of improving cycle performance, inhibiting volume deformation, and large specific surface area.

Active Publication Date: 2019-04-26
TSINGHUA UNIV
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  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

However, these initial Li-free frameworks cannot be directly matched with high-energy-density Li-free cathode materials such as sulfur cathodes, oxygen cathodes, and other Li-free cathodes.
Therefore, if these Li-composite Li metal anodes need to be used in next-generation Li metal batteries, high-temperature hot-melt methods and pre-electrodeposition methods have been proposed to fill the pores of the 3D framework with Li metal, but these methods are complicated and dangerous. , but also generate a lot of waste

Method used

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  • Composite metal lithium cathode with lithium-carbon composite interface layer and preparation method thereof
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  • Composite metal lithium cathode with lithium-carbon composite interface layer and preparation method thereof

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preparation example Construction

[0025] Its preparation method comprises the following steps:

[0026] 1) Pretreatment of the carbon framework material: the carbon framework material is dehydrated and then contacted with metal lithium;

[0027] 2) Pressurizing the metal lithium bonded or adhered to the carbon framework material, and pressing part or all of the metal lithium into the pores of the carbon framework material to obtain a composite metal lithium negative electrode. 3) The composite lithium metal negative electrode is placed in an environment where the water value is less than 1ppm and the oxygen value is less than 1ppm, and the lithium-carbon composite interface layer is formed outside the carbon skeleton to obtain a composite lithium metal negative electrode with an interface layer.

[0028] The following methods can be used for the pretreatment of the carbon skeleton material in the early stage. The powdery carbon skeleton material is dispersed in water or an organic solvent to prepare a slurry, ...

Embodiment 1

[0031] A kind of carbon paper / lithium strip composite metal lithium negative electrode with lithium-carbon composite interfacial layer, its preparation process is as follows,

[0032] Align and stack the carbon paper (100 μm) and lithium strip (50 μm) after dehydration and drying, and the carbon paper is as figure 2 shown. Rolling is carried out by a rolling mill, the pressure is 6 MPa, and the temperature is 20 degrees Celsius. The composite lithium metal negative electrode after rolling is as image 3 shown. The ultra-thin lithium strips are rolled and embedded in the interstices of the carbon fibers.

[0033] After rolling, the composite metal lithium negative electrode was placed in a glove box with a water value of less than 0.1ppm and an oxygen value of less than 0.1ppm for 48h and 108h, respectively, at a temperature of 20 degrees Celsius. From Figure 4 It can be seen that after standing for 72 hours, the pressed metal lithium adheres better to the carbon paper. ...

Embodiment 2

[0036] A Ketjen black / lithium strip composite metal lithium negative electrode with a lithium-carbon composite interface layer, the preparation process of which is as follows:

[0037] Add Ketjen black to ultrapure water to make a slurry, and use a coating machine to coat the slurry on copper foil (referred to as carbon-coated copper foil), and dry it in a vacuum oven at 60 degrees Celsius for 6 hours for later use.

[0038] Align and stack the lithium strip (100 μm) and the carbon-coated copper foil (the carbon layer of the carbon-coated copper foil is placed towards the ultra-thin lithium strip), and roll it through a roller press with a rolling pressure of 20 MPa and a temperature of 50 degrees Celsius.

[0039] After rolling, the copper foil on the upper layer is peeled off (the Ketjen black carbon layer sticks to the surface of the ultra-thin lithium strip after rolling), and the ultra-thin lithium strip / Ketjen black composite metal lithium negative electrode is obtained, ...

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Abstract

The invention discloses a composite metal lithium cathode with a lithium-carbon composite interface layer and a preparation method thereof and belongs to the technical field of secondary batteries. The outer surface of the carbon framework material of the composite metal lithium cathode is coated with the lithium-carbon composite interface layer, and the structure of the composite interface layeris a lithium-carbon intercalation structure formed by intercalating metal lithium atoms into the carbon skeleton material layer. The forming method comprises the following steps: pressing lithium metal into pores of the carbon framework material in a pressurizing mode, and forming a lithium-carbon composite interface layer, which is conductive and stable to lithium, on the surface of the carbon framework material after activation for a certain time due to the adsorption or intercalation effect. The preparation method is simple and feasible, and the generated lithium-carbon composite interfacelayer is very uniform in distribution and thickness in the carbon framework material. The interface layer can effectively improve the volume expansion problem of the lithium metal cathode in the circulation process and prolong the cycle life of the batteries.

Description

technical field [0001] The invention relates to a composite metal lithium negative electrode with a lithium-carbon composite interface layer in a secondary battery and a preparation method thereof, which produces a lithium-carbon composite interface layer and belongs to the technical field of secondary batteries. Background technique [0002] Due to the rapid development of portable electronic devices, electric vehicles, and grid-scale energy storage, batteries with high energy density have attracted much attention. Despite the great success of lithium-ion battery systems based on graphite anodes, the relatively low theoretical energy density limits their further applications as next-generation portable power sources. Compared with graphite anode, metallic lithium has a very high specific capacity (3860mA h g -1 ) and extremely low reduction potential (-3.040 V versus the standard hydrogen electrode), thus promoting the potential application of lithium metal batteries. How...

Claims

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Application Information

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IPC IPC(8): H01M4/134H01M4/1395H01M4/36H01M4/38H01M4/62H01M10/0525
CPCH01M4/134H01M4/1395H01M4/362H01M4/382H01M4/625H01M4/628H01M10/0525Y02E60/10
Inventor 张强石鹏李滔程新兵
Owner TSINGHUA UNIV
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