Composite metal lithium negative electrode, preparation method thereof and lithium battery

A composite metal and lithium negative electrode technology, applied in the field of materials, can solve the problems of easy growth of lithium dendrites, uneven deposition and dissolution behavior, etc., achieve low price, improve mass/volume energy density, and alleviate volume changes.

Inactive Publication Date: 2020-11-10
TIANMU LAKE INST OF ADVANCED ENERGY STORAGE TECH CO LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

[0005] The rate properties of the metal lithium anode are directly related to the current density on the surface of the metal lithium anode. Generally, the deposition and dissolution behavior of the metal lithium anode is more uneven at a high current density, and it is easier to grow lithium dendrites and pulverize.

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  • Composite metal lithium negative electrode, preparation method thereof and lithium battery
  • Composite metal lithium negative electrode, preparation method thereof and lithium battery

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preparation example Construction

[0039] Its preparation method is as figure 1 As shown in the preparation method process flow, mainly comprises the following steps:

[0040] Step 110, preparing a porous membranous carbon layer;

[0041] The porous membranous carbon layer of the present invention is composed of graphite-like carbon material, amorphous carbon-like material and / or graphene-like carbon material, the thickness is between 20 microns and 200 microns, and the porosity is between 20% and 95%. It can be prepared by physical, chemical or electrochemical methods.

[0042] The specific materials of the porous membranous carbon layer include but are not limited to: fibrous carbon such as carbon fiber and carbon nanotube, graphene-like carbon such as single-layer double-layer or multi-layer graphene, graphene oxide and redox graphene, natural graphite, Artificial graphite such as mesocarbon microspheres and graphite fibers, easily graphitizable soft carbon such as petroleum coke and needle coke, hard carb...

Embodiment 1

[0057] The film-like porous fibrous carbon film with a porosity of 70% and a thickness of 80 microns was repeatedly washed three times with deionized water, alcohol, and acetone, and dried in a vacuum drying oven to obtain a clean porous film carbon. Prepare a 3mol / L zinc acetate aqueous solution with deionized water, soak the clean porous film carbon in the 3mol / L zinc acetate aqueous solution, stir for 1 hour, take out the porous film carbon fully soaked in the zinc acetate aqueous solution, and place it at room temperature Dry it in the drying room for 12 hours, and then put it in a vacuum drying oven at 120°C for 6 hours. The dried porous carbon film was placed in a muffle furnace, sintered at 800° C. for 12 hours under an inert atmosphere, and taken out after natural cooling.

[0058] The dry porous carbon film, and the 99% metal lithium with a purity of 50 microns are rolled by a hot roller press under an inert atmosphere. The machine roll temperature was 80°C. After t...

Embodiment 2

[0061] The film-like porous fibrous carbon film with a porosity of 70% and a thickness of 160 microns was washed three times with deionized water, alcohol and acetone, and dried in a vacuum oven to obtain a clean porous carbon film. Prepare a 2mol / L zinc acetate aqueous solution with deionized water, soak the clean porous film carbon in the prepared zinc acetate aqueous solution, stir for 2 hours, take out the porous film carbon fully soaked in the zinc acetate aqueous solution, and dry at room temperature Dry in the air for 12 hours in between, and then bake in a vacuum oven at 150°C for 6 hours. The dried porous carbon film was sintered at 800° C. for 12 hours in an inert atmosphere in a muffle furnace, and then taken out after cooling down naturally.

[0062] The dry porous carbon film and the 99% metal lithium with a purity of 100 microns are rolled by a hot roller press in a drying room. The thickness of the roll is more than the total film thickness. The machine roll te...

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Abstract

The invention relates to a composite metal lithium negative electrode, a preparation method thereof and a lithium battery. The preparation method of the composite metal lithium negative electrode comprises the following steps: preparing a porous film-shaped carbon layer; carrying out lithiation treatment on the porous film-shaped carbon layer; compounding lithium metal with the porous film-shapedcarbon layer subjected to lithiation treatment to obtain a composite lithium metal negative electrode, wherein in the composite metal lithium negative electrode, the porous film-shaped carbon layer subjected to lithiation treatment forms a lithiation carbon skeleton, and metal lithium precipitates are attached to the carbon skeleton to form a lithium ion interconnection and intercommunication network channel in the charging and discharging process. According to the composite metal lithium negative electrode, a negative electrode current collector is not used, so the content of negative electrode metal lithium is increased, the volume change of the metal lithium negative electrode in the charging and discharging process can be greatly relieved due to the existence of the carbon skeleton, the mass/volume energy density of a lithium battery can be increased, and the cycle performance and safety performance of the battery are improved; meanwhile, the electrode has a high specific surface area, so the rate capability of the battery can be improved.

Description

technical field [0001] The invention relates to the field of material technology, in particular to a composite metal lithium negative electrode, a preparation method thereof, and a lithium battery. Background technique [0002] Secondary lithium batteries are currently the battery system with the highest energy density among commercial batteries, and are widely used in consumer electronics, electric vehicles, large-scale energy storage and other fields, and the market segments of application fields are gradually expanding, such as medical electronics, electric tools, wireless In fields such as man-machine, data center, and national security, the rapid development of different fields has played an important role in promoting the development of high energy density batteries. [0003] Due to its specific capacity of 3860mAh / g and deposition potential of -3.04V (relative to the standard hydrogen electrode), lithium metal is the lowest among known materials and has a smaller dens...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H01M4/1395H01M4/62H01M4/04H01M4/38H01M10/052
CPCH01M4/0435H01M4/0471H01M4/1395H01M4/382H01M4/625H01M4/628H01M10/052H01M2004/027Y02E60/10
Inventor 李泉李泓王丽平
Owner TIANMU LAKE INST OF ADVANCED ENERGY STORAGE TECH CO LTD
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