Negative electrode material of flexible sodium metal battery and preparation method thereof

A battery negative electrode and sodium metal technology, which is applied in battery electrodes, secondary batteries, circuits, etc., can solve the problems of high quality, hard carbon without good flexibility, and low energy density of composite electrodes, so as to solve volume expansion and high utilization rate , the effect of inhibiting the growth of sodium dendrites

Inactive Publication Date: 2018-08-28
BEIJING INSTITUTE OF TECHNOLOGYGY
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

The above research results put forward many ideas for suppressing dendrites, but the problem of volume expansion caused by the skeletonless structure of sodium metal anodes has not been effectively solved. Volume expansion, but because hard carbon does not have good flexibility and high quality, the energy density of composite electrodes is extremely low

Method used

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  • Negative electrode material of flexible sodium metal battery and preparation method thereof
  • Negative electrode material of flexible sodium metal battery and preparation method thereof
  • Negative electrode material of flexible sodium metal battery and preparation method thereof

Examples

Experimental program
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Effect test

Embodiment 1

[0044] A method for preparing a flexible sodium metal battery negative electrode material, the steps of the method are as follows:

[0045] 40mg (2.5mg / ml) of graphene oxide (the mass ratio of C and O is 1.95:1) was ultrasonically dispersed for 120min, and 120mg of ascorbic acid was added, stirred for 30min, and then placed in a water bath at 50°C for 6h to obtain an intermediate product, which was used to Wash the intermediate product repeatedly with ionic water, then put the intermediate product into a freeze dryer, and freeze-dry it at -181°C for 24 hours at 10 MPa to obtain graphene airgel. After slicing, punch the graphene airgel into Ф= The 10mm disc was transferred to a glove box, and 6mg of liquid metal sodium was adsorbed at 300°C to obtain a flexible sodium metal battery negative electrode material.

[0046] Scanning electron microscopy results of graphene aerogels as figure 1 As shown, the stacked pore-like structures constitute a compact 3d conductive framework wi...

Embodiment 2

[0051] A method for preparing a flexible sodium metal battery negative electrode material, the steps of the method are as follows:

[0052] 40mg (2.5mg / ml) of graphene oxide (the mass ratio of C and O is 2.5:1) was ultrasonically dispersed for 120min, and 120mg of ascorbic acid was added, stirred for 30min, and then placed in a water bath at 50°C for 6h to obtain an intermediate product, which was used to Wash the intermediate product repeatedly with ionic water, then put the intermediate product into a freeze dryer, and freeze-dry it at -181°C for 24 hours at 10 MPa to obtain graphene airgel. After slicing, punch the graphene airgel into Ф= The 10mm disc was transferred to a glove box, and 6mg of liquid metal sodium was adsorbed at 300°C to obtain a flexible sodium metal battery negative electrode material.

[0053] The scanning electron microscopy results of graphene airgel show that the stacked pore-like structure constitutes a compact 3D conductive framework with a pore ...

Embodiment 3

[0058] A method for preparing a flexible sodium metal battery negative electrode material, the steps of the method are as follows:

[0059] 40mg (2.5mg / ml) of graphene oxide (the mass ratio of C and O is 1.95:1) was ultrasonically dispersed for 120min, and 120mg of ascorbic acid was added, stirred for 30min, and then placed in a water bath at 120°C for 6h to obtain an intermediate product, which was used to Wash the intermediate product repeatedly with ionic water, then put the intermediate product into a freeze dryer, and freeze-dry it at -181°C for 24 hours at 10 MPa to obtain graphene airgel. After slicing, punch the graphene airgel into Ф= The 10mm disc was transferred to a glove box, and 6mg of liquid metal sodium was adsorbed at 300°C to obtain a flexible sodium metal battery negative electrode material.

[0060] The scanning electron microscopy results of graphene airgel show that the stacked pore-like structure constitutes a compact 3D conductive framework with a por...

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Abstract

The invention relates to a negative electrode material of a flexible sodium metal battery and a preparation method thereof and belongs to the technical field of sodium metal batteries. The negative electrode material is characterized in that graphene aerogel is adopted as a skeleton, and sodium metal is distributed in a skeleton structure; the hole diameter range of the skeleton is 20-200mu m, andthe mass percentage of the sodium metal in the negative electrode material is 90-98%. The preparation method of the negative electrode material comprises the following steps of: adding a conducting material into water, then adding a reducing agent, and reacting for 6-24 hours at the temperature of 50-200 DEG C to obtain an intermediate product; washing with water, freezing drying under 5-10 MPa to form the graphene aerogel; then adopting the graphene aerogel as a skeleton, and compounding with liquid metal sodium to obtain the negative electrode material. The negative electrode material has good flexibility, uniform porosity and large specific surface area; as a negative electrode of the sodium metal battery, uniform nucleation of sodium ions is ensured, the volume expansion in the circulating process is relieved, and due to higher conductivity, the overpotential is effectively reduced.

Description

technical field [0001] The invention relates to a flexible sodium metal battery negative electrode material and a preparation method thereof, belonging to the technical field of sodium metal batteries. Background technique [0002] Issues such as fossil fuel consumption, environmental pollution, and global warming have aroused great interest in the development of clean / renewable energy and electric vehicles. However, some renewable energy sources such as wind energy, solar energy, and tidal energy are unstable and discontinuous, and cannot be effectively used in actual production and life. To solve these problems, advanced energy conversion and storage technologies play a crucial role. After decades of unremitting efforts, lithium-ion batteries have become the main power source of portable electronic devices. Due to their high energy density and long lifetime, lithium-ion batteries have attracted increasing attention in recent years for applications in electric vehicles an...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H01M4/36H01M4/38H01M4/62H01M10/054H01M10/0566
CPCH01M4/362H01M4/381H01M4/62H01M4/625H01M10/054H01M10/0566Y02E60/10
Inventor 谢嫚周佳辉陈人杰吴锋罗锐李丽李月姣
Owner BEIJING INSTITUTE OF TECHNOLOGYGY
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