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Aluminum nitride doped reduced graphene oxide-lithium composite material as well as preparation method and application thereof

A composite material, aluminum nitride technology, which is applied in the field of aluminum nitride-doped reduced graphene oxide-lithium composite materials and its preparation, can solve the problems of reducing battery Coulombic efficiency, low battery energy density, and intensifying dendrite growth. Achieve the effects of alleviating volume change, alleviating growth and negative electrode volume expansion, and improving utilization

Pending Publication Date: 2022-05-20
山东威固新能源科技有限公司
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

During the battery cycle, the repeated dissolution and deposition of metallic lithium intensifies the growth of dendrites, which may pierce the separator and cause battery short circuit with thermal runaway, which poses a serious explosion risk and safety hazard
(2) The continuous consumption of electrolyte and the continuous generation of "dead lithium" reduce the Coulombic efficiency of the battery
However, in the current technical scheme of using carbon material skeletons (such as carbon cloth, carbon fiber, and bio-carbon materials) as three-dimensional current collectors, lithium excess will almost always occur after the three-dimensional skeleton is melted, and the introduction of an inactive skeleton makes the overall energy density of the battery lower

Method used

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  • Aluminum nitride doped reduced graphene oxide-lithium composite material as well as preparation method and application thereof
  • Aluminum nitride doped reduced graphene oxide-lithium composite material as well as preparation method and application thereof
  • Aluminum nitride doped reduced graphene oxide-lithium composite material as well as preparation method and application thereof

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preparation example Construction

[0032] The invention provides a method for preparing an aluminum nitride-doped reduced graphene oxide-lithium composite material, comprising the following steps:

[0033] mixing the aluminum nitride and graphene oxide aqueous dispersion to obtain a suspension;

[0034] The suspension is suction filtered and dried to obtain an aluminum nitride-doped graphene oxide film;

[0035] The aluminum nitride-doped graphene oxide film is reduced and expanded by thermal radiation to obtain an expanded three-dimensional skeleton of aluminum nitride-doped reduced graphene oxide;

[0036] After pressing the expanded three-dimensional skeleton of the aluminum nitride-doped reduced graphene oxide, the process of absorbing liquid molten metal lithium is carried out to obtain the aluminum nitride-doped reduced graphene oxide-lithium composite material.

[0037] In the present invention, unless otherwise specified, each component is a commercially available product well known to those skilled in...

Embodiment 1

[0063] 2 mg of aluminum nitride with a particle size of 2.5 μm and 10 mL of a graphene oxide aqueous dispersion with a graphene oxide content of 1 mg / mL were ultrasonically mixed for 15 minutes to obtain a suspension;

[0064] After the suspension was vacuum filtered for 3 hours, it was dried at 25°C for 25 hours, and the obtained film was peeled off from the filter membrane to obtain an aluminum nitride-doped graphene oxide film;

[0065] Using a carbon fiber infrared lamp, the aluminum nitride-doped graphene oxide film is reduced and expanded by thermal radiation at 400W for 4 seconds to obtain an expanded three-dimensional framework of aluminum nitride-doped reduced graphene oxide;

[0066] The aluminum nitride-doped reduced graphene oxide puffed three-dimensional skeleton was rolled three times between rollers with a pitch of 30 μm, and then transferred to a glove box with water and oxygen content <0.1 ppm, and the solid metal The nickel crucible of lithium was kept at 400...

Embodiment 2

[0068] 5 mg of aluminum nitride with a particle size of 2.5 μm and 10 mL of a graphene oxide aqueous dispersion with a graphene oxide content of 1 mg / mL were ultrasonically mixed for 15 minutes to obtain a suspension;

[0069] After the suspension was vacuum filtered for 3 hours, it was dried at 25°C for 25 hours, and the obtained film was peeled off from the filter membrane to obtain an aluminum nitride-doped graphene oxide film;

[0070] Using a carbon fiber infrared lamp, the aluminum nitride-doped graphene oxide film is reduced and expanded by thermal radiation at 400W for 4 seconds to obtain an expanded three-dimensional framework of aluminum nitride-doped reduced graphene oxide;

[0071] The aluminum nitride-doped reduced graphene oxide puffed three-dimensional skeleton was rolled three times between rollers with a spacing of 30 μm, and then transferred to a glove box with water and oxygen content <0.1 ppm, and the solid metal The nickel crucible of lithium was kept at 4...

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Abstract

The invention belongs to the technical field of electrode materials, and particularly relates to an aluminum nitride doped reduced graphene oxide-lithium composite material as well as a preparation method and application thereof. According to the aluminum nitride doped reduced graphene oxide-lithium composite material provided by the invention, the volume change of negative electrode metal lithium in the deposition stripping cycle process can be relieved, and the local current density uniform electric field distribution is remarkably reduced, so that the growth of lithium dendrites and the volume expansion of a negative electrode are relieved, and the cycle stability and coulombic efficiency of a battery are improved; and meanwhile, the lithium loading amount of the aluminum nitride doped reduced graphene oxide-lithium composite material can be regulated and controlled through the distance between rollers in the rolling process, so that the utilization rate of metal lithium and the overall energy density of the battery can be improved. The test result of the embodiment shows that the aluminum nitride doped reduced graphene oxide-lithium composite material provided by the invention does not generate excessive lithium, and has the advantages of high energy density, low interface impedance and excellent long cycle stability.

Description

technical field [0001] The invention belongs to the technical field of electrode materials, in particular to an aluminum nitride-doped reduced graphene oxide-lithium composite material and a preparation method and application thereof. Background technique [0002] Lithium-ion batteries are currently the most widely used secondary batteries. Lithium metal has an ultra-high specific capacity (3860mAh / g), the lowest electrochemical potential for hydrogen (-3.04V vs standard hydrogen electrode) and low density. Using lithium metal as the negative electrode will greatly increase the energy density of the battery . [0003] The safety issues and cycle stability of metallic lithium anodes are the biggest obstacles to commercial applications, mainly due to the uncontrollable growth of lithium dendrites, which are manifested in the following aspects: (1) The uncontrollable growth of lithium dendrites. During the battery cycle, the repeated dissolution and deposition of metallic lit...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H01M4/62H01M4/66H01M4/38H01M10/052
CPCH01M4/628H01M4/663H01M4/382H01M10/052H01M2004/027Y02E60/10
Inventor 涂江平朱嘉琪梁文明王秀丽孟浩潘海滨
Owner 山东威固新能源科技有限公司
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