Carbon material lithium metal composite negative electrode and preparation method and application thereof

A carbon material and lithium metal technology, which is applied in the field of high energy density lithium battery and its electrode material preparation, can solve the problem of the high density of the metal three-dimensional current collector frame itself, which affects the overall energy density of the lithium metal composite negative electrode, and affects the lithium metal composite negative electrode. Safety and other issues, to achieve the effect of facilitating the promotion of industrial production, excellent cycle stability, and good practical prospects

Pending Publication Date: 2022-03-18
SHANGHAI UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0004] 1. The metal three-dimensional current collector frame itself has a high density and no lithium storage capacity, which seriously affects the overall energy density of the lithium metal composite negative electrode;
[0005] 2. There are sharp protrusions in the metal three-dimensional current collector frame structure, and there is a risk of puncturing the separator in the battery structure and causing a short circuit, which seriously affects the safety of the lithium metal composite negative electrode;
[0006] 3. The modification measures adopted to improve the lithium affinity of the three-dimensional current collector frame are often complicated to operate, the experimental conditions are harsh, and the overall cost is high, which is not conducive to industrialization and application;

Method used

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  • Carbon material lithium metal composite negative electrode and preparation method and application thereof
  • Carbon material lithium metal composite negative electrode and preparation method and application thereof
  • Carbon material lithium metal composite negative electrode and preparation method and application thereof

Examples

Experimental program
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Effect test

Embodiment 1

[0042] In this embodiment, a carbon material lithium metal composite negative electrode is prepared by air oxidation of hard carbon, and the specific steps are as follows:

[0043] 1. Weigh hard carbon particles with an average particle size of 5 μm and place them in a tube furnace with an air flow of 100L h -1 Pass high-purity air into the furnace.

[0044] 2. Set the tube furnace to heat up at 5°C min -1 Heating from room temperature to 300°C and keeping it warm for 6h, then cooling down to room temperature naturally to obtain hard carbon materials treated by air oxidation, which is recorded as the 300°C-6h group.

[0045] 3. Weigh the 300°C-6h group hard carbon, acetylene black, polymethylcellulose sodium and styrene-butadiene latex mixture with mass fractions of 90%, 2%, 4% and 4%, and use a defoaming mixer to fully stir them evenly And use deionized water to adjust to a suitable state of fluidity.

[0046] 4. Use a coating mold with a thickness of 400 μm to evenly coat...

Embodiment 2

[0067] In this embodiment, a carbon material lithium metal composite negative electrode is prepared by coating the surface of hard carbon with silver, and the specific implementation steps are as follows:

[0068] 1. Weigh hard carbon particles with an average particle size of 5 μm, mix them with a surfactant, and disperse them in deionized water by ultrasonic.

[0069] 2. Use 2wt% silver nitrate aqueous solution as the silver source, configure the silver ammonia solution, and fully mix the silver ammonia solution with the dispersion system in step 1.

[0070] 3. Use 40% formaldehyde aqueous solution as a reducing agent, add it to the mixed solution in step 2 in excess, heat and stir for 20 minutes, after the reaction is complete, suction filter and dry the resulting product to obtain a silver-coated hard carbon material.

[0071] 4. Weigh the mixture of silver-coated hard carbon, acetylene black, polymethylcellulose sodium and styrene-butadiene latex with a mass fraction of 9...

Embodiment 3

[0075] In this embodiment, a carbon material lithium metal composite negative electrode is prepared by air oxidation of graphite, and the specific implementation steps are as follows:

[0076] 1. Weigh the graphite powder and place it in the tube furnace with an air flow of 100L h -1 Pass high-purity air into the furnace.

[0077] 2. Set the tube furnace to heat up at 5°C min -1 After heating from room temperature to 400°C, heat preservation for 6h, and then naturally cooling to room temperature to obtain graphite treated by air oxidation, which is recorded as the 400°C-6h group.

[0078] 3. Weigh the 400°C-6h group graphite, acetylene black, polymethylcellulose sodium and styrene-butadiene latex mixture with mass fractions of 90%, 2%, 4% and 4%, respectively, use a defoaming mixer to fully stir evenly and use Adjust the deionized water to a suitable state of fluidity.

[0079] 4. Use a coating mold with a thickness of 400 μm to evenly coat the slurry on the copper foil, th...

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Abstract

The invention discloses a carbon material lithium metal composite negative electrode and a preparation method and application thereof, and the carbon material lithium metal composite negative electrode is formed by compounding a carbon material three-dimensional current collector which is constructed on the surface of a copper foil and is subjected to surface modification treatment with lithium metal. According to the preparation method of the carbon material lithium metal composite negative electrode, the lithium affinity of a carbon material three-dimensional current collector is improved by performing surface treatment on a carbon material, so that the cycling stability of the carbon material lithium metal composite negative electrode is improved. According to the application of the carbon material lithium metal composite negative electrode, the carbon material lithium metal composite negative electrode and a positive electrode material are assembled into a lithium metal battery; or the composite material is applied to various lithium metal battery systems such as Li-S batteries and Li-air batteries. The lithium metal composite negative electrode prepared by the method also shows excellent cycling stability in total battery circulation, is high in operability, is convenient for industrial production and popularization, and has a wide application prospect in the field of high-energy-density lithium batteries.

Description

technical field [0001] The invention relates to a composite negative electrode and its preparation method and application, in particular to a carbon material lithium metal composite negative electrode and its preparation method and application, and belongs to the field of preparation of high energy density lithium batteries and electrode materials thereof. Background technique [0002] With the rapid popularization of electric vehicles and the improvement of environmental protection requirements, it is of great significance to develop a new generation of high energy density lithium batteries. Lithium metal has a very high theoretical capacity (3860mAh g -1 ) and the lowest electrochemical potential (-3.04Vvs.SHE), it is an ideal choice for the next generation of high voltage and high specific energy lithium battery anode materials. However, due to the very active chemical properties of lithium metal itself, and the huge volume expansion effect during the lithium deposition / ...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H01M4/133H01M4/1393H01M4/66H01M10/052
CPCH01M4/663H01M4/133H01M4/1393H01M10/052Y02E60/10
Inventor 穆晓阳周晶晶郭炳焜
Owner SHANGHAI UNIV
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