Graphene-based high-performance composite lithium metal negative electrode material and preparation method thereof

A metal negative electrode, high-performance technology, applied in the direction of battery electrodes, electrical components, electrochemical generators, etc., can solve the problems of capacity decay, continuous cycle collapse, SEI can not adapt to volume changes, etc., to inhibit the formation of lithium dendrites, The effect of excellent performance

Active Publication Date: 2019-06-04
SOUTH CHINA UNIV OF TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

The stability of the electrode size is equally important for the practical application of lithium anodes. Under the infinite relative volume change, huge internal stress fluctuations and floating interfaces will damage the battery, resulting in potential safety hazards, which bring serious problems to the application of batteries in confined spaces. to great engineering challenges
More importantly, the stability of the SEI is also closely related to the electrode-scale stability, and the SEI may not be able to adapt to the sharp volume change, thus facing the danger of continuous cycle collapse, which in turn will exacerbate the local Li dendrite growth and Continuous decomposition of the electrolyte, resulting in rapid capacity fading and potential safety hazards

Method used

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  • Graphene-based high-performance composite lithium metal negative electrode material and preparation method thereof
  • Graphene-based high-performance composite lithium metal negative electrode material and preparation method thereof
  • Graphene-based high-performance composite lithium metal negative electrode material and preparation method thereof

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Experimental program
Comparison scheme
Effect test

Embodiment 1

[0032] (1) Add 45㎎zinc fluoride and 15㎎magnesium fluoride into 10mL of deionized water and stir evenly, and then disperse with 300w ultrasonic wave at a frequency of 40kHz for 10min.

[0033] (2) Add 20 mL of GO solution with a concentration of 4 mg / mL to the above solution, and stir for 12 h at a speed of 600 r / min to obtain a composite GO solution doped with magnesium fluoride.

[0034] (3) Take 3 ml of composite GO solution, vacuum filter with a water-based filter membrane, the relative vacuum degree is -0.08Mpa to obtain GO hydrogel, and put the GO hydrogel together with the filter membrane into a relative vacuum degree of -0.5Mpa temperature Dry in a vacuum oven at 50 °C for 12 h to obtain a GO film with a thickness of 30 μm.

[0035](4) In a glove box filled with argon protection with water and oxygen content lower than 0.1ppm, 304 stainless steel is used to heat lithium metal to 400°C to change lithium metal from solid to liquid. Then, the edge of the GO film with a di...

Embodiment 2

[0037] (1) Add 40㎎zinc fluoride and 15㎎magnesium fluoride into 10mL of deionized water and stir evenly, and then disperse with 60kHz frequency and 600w ultrasonic wave for 15min.

[0038] (2) Add 20 mL of GO solution with a concentration of 4 mg / mL to the above solution, and stir for 12 h at a speed of 700 r / min to obtain a composite GO solution doped with magnesium fluoride.

[0039] (3) Take 3 ml of composite GO solution, vacuum filter with a water-based filter membrane, the relative vacuum degree is -0.1Mpa to obtain GO hydrogel, put the GO hydrogel together with the filter membrane into the relative vacuum degree of -1Mpa and the temperature is Dry in a vacuum oven at 65 °C for 24 h to obtain a GO film with a thickness of 40 μm.

[0040] (4) In a glove box filled with argon protection with water and oxygen content lower than 0.1ppm, 304 stainless steel is used to heat lithium metal to 450°C to change lithium metal from solid to liquid. Then, the edge of the GO film with a...

Embodiment 3

[0042] (1) Add 42.5㎎zinc fluoride and 15㎎magnesium fluoride into 10mL of deionized water and stir evenly, then disperse for 12.5min with frequency and 50kHz power of 500w ultrasonic waves.

[0043] (2) Add 20 mL of GO solution with a concentration of 4 mg / mL to the above solution, and stir for 15 h at a speed of 650 r / min to obtain a composite GO solution doped with magnesium fluoride.

[0044] (3) Take 3 ml of composite GO solution, vacuum filter with a water-based filter membrane, the relative vacuum degree is -0.09Mpa to obtain GO hydrogel, put the GO hydrogel together with the filter membrane into a relative vacuum degree of -0.75Mpa temperature Dry in a vacuum oven at 55 °C for 15 h to obtain a GO film with a thickness of 35 μm.

[0045] (4) In a glove box filled with argon protection with water and oxygen content lower than 0.1ppm, 304 stainless steel is used to heat lithium metal to 425°C to change lithium metal from solid to liquid. Then, the edge of the GO film with ...

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Abstract

The invention discloses a graphene-based high-performance composite lithium metal negative electrode material and a preparation method thereof. The preparation method comprises the steps of using a modified graphene oxide as a substrate, performing vacuum suction filtration and drying on the substrate to obtain a graphene oxide (GO) thin film, carrying out thermal reduction on the GO thin film inan argon atmosphere having water and oxygen content less than 0.1 ppm to obtain reduced graphene oxide (RGO), pre-embedding high temperature liquid lithium metal at the temperature of 400 DEG C into the RGO, and cooling the RGO to obtain a three-dimensional layered lithium metal negative electrode, that is, the graphene-based high-performance composite lithium metal negative electrode material. The obtained three-dimensional layered lithium metal electrode material has good lithium storage performance and excellent cycle stability, and the energy and power density of a lithium ion battery madeof the material are improved to a certain extent. A porous three-dimensional graphene bracket inhibits the volume expansion of lithium, and the electrode material exhibits the advantages of good flexibility and small changes in electrode size during the cycling process.

Description

technical field [0001] The invention belongs to the technical field of negative electrodes of lithium ion batteries, and in particular relates to a graphene-based high-performance composite lithium metal negative electrode material and a preparation method thereof. Background technique [0002] Lithium-ion batteries are widely used in portable electronics, electric vehicles and other fields, and the requirements of social demand for battery energy and power density are getting higher and higher. However, compared with the continuous upgrading of cathode materials in the lithium-ion battery industry, the development of anode materials is relatively slow. At present, lithium-ion batteries based on the "rocking chair" energy storage mechanism are approaching their energy density limit. Graphite has been used as an anode material for decades, but its relatively low specific capacity has become one of the main bottlenecks restricting the development of lithium-ion batteries. . ...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H01M4/1395H01M4/134H01M4/38H01M4/62H01M10/0525
CPCY02E60/10
Inventor 丘勇才徐庆帅张跃钢李伟善
Owner SOUTH CHINA UNIV OF TECH
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