Heusler alloy Fe2CoAl/C self-supporting composite material for lithium electrode as well as preparation method and application of Heusler alloy Fe2CoAl/C self-supporting composite material

A composite material, lithium electrode technology, applied in battery electrodes, non-aqueous electrolyte battery electrodes, circuits, etc., can solve the problems of high cost and complicated methods, and achieve the effect of avoiding uneven deposition

Active Publication Date: 2021-10-26
SHAANXI UNIV OF SCI & TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

Meanwhile, adding a magnetic field through an "external strategy" to tune the Li + The deposition of lithium dendrites can also be inhibited, but the method is too complicated or expensive

Method used

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  • Heusler alloy Fe2CoAl/C self-supporting composite material for lithium electrode as well as preparation method and application of Heusler alloy Fe2CoAl/C self-supporting composite material
  • Heusler alloy Fe2CoAl/C self-supporting composite material for lithium electrode as well as preparation method and application of Heusler alloy Fe2CoAl/C self-supporting composite material
  • Heusler alloy Fe2CoAl/C self-supporting composite material for lithium electrode as well as preparation method and application of Heusler alloy Fe2CoAl/C self-supporting composite material

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0033] This embodiment provides a Heussler alloy Fe for lithium electrodes 2 The preparation method of CoAl / C self-supporting composite material specifically comprises the following steps:

[0034] Step 1: Dissolve 1.3129g of aluminum nitrate nonahydrate, 1.0185g of cobalt nitrate, and 2.8280g of ferric nitrate in 25ml of distilled water, and continue magnetic stirring for 3 hours to obtain a mixed solution;

[0035] Step 2: Weigh 2.22g of polyvinyl alcohol and add it to 20ml of distilled water, stir for 3 hours to obtain a polyvinyl alcohol solution with a mass concentration of 111g / L;

[0036] Step 3: Mix the two solutions obtained in Step 1 and Step 2 and continue to stir for 5 hours until they are evenly mixed, and then transfer the prepared mixed solution to a petri dish;

[0037] Step 4: Plasma treat the carbon paper for 10 minutes, soak the carbon paper in the mixed solution at room temperature for 2 minutes, put it in a 50°C oven and dry it for 15 minutes, and repeat ...

Embodiment 2

[0040] This embodiment provides a Heussler alloy Fe for lithium electrodes 2 The preparation method of CoAl / C self-supporting composite material specifically comprises the following steps:

[0041] Step 1: Dissolve 1.0667g of aluminum chloride, 1.0387g of cobalt chloride, and 2.5953g of ferric chloride in 40ml of distilled water, and continue magnetic stirring for 4 hours to obtain a mixed solution;

[0042] Step 2: Weigh 2 g of polyvinyl alcohol and add it to 50 ml of distilled water, stir for 3.5 hours to obtain a polyvinyl alcohol solution with a mass concentration of 40 g / L;

[0043] Step 3: Mix the two solutions obtained in Step 1 and Step 2 and continue to stir for 8 hours until they are evenly mixed, and then transfer the prepared mixed solution to a petri dish;

[0044] Step 4: Plasma treat the carbon paper for 12 minutes, soak the carbon paper in the mixed solution for 1 minute at room temperature, put it in a 30°C oven and dry it for 20 minutes, and repeat the opera...

Embodiment 3

[0047] This embodiment provides a Heussler alloy Fe for lithium electrodes 2 The preparation method of CoAl / C self-supporting composite material specifically comprises the following steps:

[0048] Step 1: Dissolve 0.8554g of aluminum sulfate, 1.4058g of cobalt sulfate, and 1.9993g of ferric sulfate in 25ml of distilled water, and continue magnetic stirring for 5 hours to obtain a mixed solution;

[0049] Step 2: Weigh 4 g of polyvinyl alcohol and add it to 30 ml of distilled water, stir for 5 hours to obtain a polyvinyl alcohol solution with a mass concentration of 133 g / L;

[0050] Step 3: Mix the two solutions obtained in Step 1 and Step 2 and continue to stir for 10 h until the mixture is uniform, and transfer the prepared mixed solution to a petri dish;

[0051] Step 4: Plasma treat the carbon paper for 15 minutes, soak the carbon paper in the mixed solution at room temperature for 5 minutes, put it in a 60°C oven and dry it for 10 minutes, and repeat the operation once;...

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Abstract

The invention discloses a Heusler alloy Fe2CoAl / C self-supporting composite material for a lithium electrode. A preparation method of the Heusler alloy Fe2CoAl / C self-supporting composite material comprises the following steps: step 1, weighing an aluminum source, a cobalt source and an iron source according to the atomic molar ratio of aluminum to cobalt to iron being 1: 1: 2, and dissolving the aluminum source, the cobalt source and the iron source in distilled water to prepare a mixed solution; step 2, preparing a polyvinyl alcohol solution with the mass concentration of 40-200g / L; step 3, uniformly mixing the two solutions; step 4, soaking carbon paper in the mixed solution and then putting the carbon paper in a drying oven to be dried; step 5, putting the impregnated carbon paper into a muffle furnace at 250-350 DEG C, and pre-oxidizing for 2-5 hours in an air atmosphere and sintering in a tubular atmosphere furnace at the temperature of 650-850 DEG C to obtain a final material. According to the invention, an impregnation method and an oxidation-reduction method are adopted to add the lithium-loving Heusler alloy layer with intrinsic magnetism on the carbon-based material, so that the uneven deposition of Li < + > and the formation of moss / dendritic lithium are effectively avoided.

Description

technical field [0001] The invention belongs to the technical field of electrode materials, relates to an electrode material and a preparation method thereof, in particular to a Heusler alloy Fe used for a lithium electrode 2 CoAl / C self-supporting composite material and its preparation method and application. Background technique [0002] Lithium metal electrodes are considered to be the "holy grail" electrodes for next-generation rechargeable batteries, and are being re-studied to meet the booming demand for high-energy-density electrodes due to their ultrahigh theoretical specific capacity and negative redox potential. However, so far, Li metal batteries still have the following limitations hindering their commercialization, such as low Coulombic efficiency, short life cycle, large volume expansion, uncontrolled Li dendrite growth, and endless interfacial reactions of lithium metal anodes. Among them, the most pressing issue is how to alleviate or solve the problem of un...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H01M4/134H01M4/1395H01M4/13
CPCH01M4/13H01M4/134H01M4/1395Y02E60/10
Inventor 王思哲王毅宋浩杰贾晓华杨进李永
Owner SHAANXI UNIV OF SCI & TECH
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