Six-element high-entropy oxide material for lithium ion battery and preparation method

A lithium-ion battery, six-element high-entropy technology, applied in electrical components, battery electrodes, circuits, etc., can solve the problems of not finding high-entropy oxide powder, poor high-current charge and discharge performance, and reduced cycle life. Achieve the effect of improving cycle stability, low cost and high specific capacity

Active Publication Date: 2019-12-10
ANHUI UNIVERSITY OF TECHNOLOGY
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, graphite-based carbon materials have two prominent shortcomings as negative electrode materials: one is poor high-current charge-discharge performance, and due to its unique layered structure, it is easy to cause the graphite layer to fall off under high-current conditions, reducing its cycle life; Graphite carbon materials are used as negative electrode materials for lithium-ion batteries, and their theoretical specific capacity is only 372mAhg -1
So far, no relevant reports on the preparation of high-entropy oxide powders by sol-gel method have been retrieved

Method used

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  • Six-element high-entropy oxide material for lithium ion battery and preparation method
  • Six-element high-entropy oxide material for lithium ion battery and preparation method
  • Six-element high-entropy oxide material for lithium ion battery and preparation method

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0026] Adopt sol-gel method to prepare high-entropy oxide (AlCoCrFeMnNi) for lithium-ion battery negative electrode material described in the present invention 3 o 4 Powder material: weigh 9.37g of Al(NO 3 ) 3 9H 2 O, 7.28g of Co(NO 3 ) 2 ·6H 2 O, 10.04g of Cr(NO 3 ) 3 9H 2 O, 10.1g of Fe(NO 3 ) 3 9H 2 O, 6.25g of Mn(NO 3 ) 2 4H 2 O and 7.27g of Ni(NO 3 ) 2 ·6H 2 O was dissolved in 20ml of distilled water, stirred evenly by magnetic force to obtain a mixed solution of metal salts; then 21.00g of citric acid was weighed and added to the mixed solution, stirred by magnetic force for 0.5h, dried at 60°C to obtain a gel, and then the gel Place it in a muffle furnace at 500°C for 30 minutes to obtain a grain size of 93nm and a specific surface area of ​​32m 2 / g spinel-type high-entropy oxide (AlCoCrFeMnNi) 3 o 4 Powder.

[0027] The active material (AlCoCrFeMnNi) 3 o 4 , carbon black (treated with nitric acid) and sodium alginate were mixed in a mass ratio of...

Embodiment 2

[0030] Adopt sol-gel method to prepare high-entropy oxide (Al 0.4 CoCrFeMnNi) 3 o 4 Powder material: weigh 3.75g of Al(NO 3 ) 3 9H 2 O, 7.28g of Co(NO 3 ) 2 ·6H 2 O, 10.04g of Cr(NO 3 ) 3 9H 2 O, 10.1g of Fe(NO 3 ) 3 9H 2 O, 6.25g of Mn(NO 3 ) 2 4H 2 O and 7.27g of Ni(NO 3 ) 2 ·6H 2 O was dissolved in 20ml of distilled water, stirred evenly by magnetic force to obtain a mixed solution of metal salts; then weighed 3.75g glycine and added to the mixed solution, stirred magnetically for 0.5h, dried at 60°C to obtain a gel, and then placed the gel in React in a muffle furnace at 450°C for 30 minutes to obtain a grain size of 103nm and a specific surface area of ​​35m 2 / g of spinel high-entropy oxides (Al 0.4 CoCrFeMnNi) 3 o 4 Powder.

[0031] The active material (Al 0.4 CoCrFeMnNi) 3 o 4 , carbon black (treated with nitric acid) and sodium alginate were mixed in a mass ratio of 6:2:2, ground and dispersed, evenly spread on copper foil, vacuum dried at 60...

Embodiment 3

[0033] Adopt sol-gel method to prepare high-entropy oxide (Al 0.2 CoCrFeMnNi) 3 o 4 Powder material: weigh 1.88g of Al(NO 3 ) 3 9H 2 O, 7.28g of Co(NO 3 ) 2 ·6H 2 O, 10.04g of Cr(NO 3 ) 3 9H 2 O, 10.1g of Fe(NO 3 ) 3 9H 2 O, 6.25g of Mn(NO 3 ) 2 4H 2 O and 7.27g of Ni(NO 3 ) 2 ·6H 2 O was dissolved in 20ml of distilled water, stirred evenly by magnetic force to obtain a mixed solution of metal salt; then weighed 1.5g of urea and added to the mixed solution, stirred magnetically for 0.5h, dried at 60°C to obtain a gel, and then placed the gel in React in a muffle furnace at 500°C for 30 minutes to obtain a grain size of 125nm and a specific surface area of ​​37m 2 / g of spinel high-entropy oxides (Al 0.2 CoCrFeMnNi) 3 o 4 Powder.

[0034] The active material (Al 0.2 CoCrFeMnNi) 3 o 4 , carbon black (treated with nitric acid) and sodium alginate were mixed in a mass ratio of 6:2:2, ground and dispersed, evenly spread on copper foil, vacuum dried at 60°C...

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Abstract

The invention provides a six-element high-entropy oxide material for a lithium ion battery and a preparation method, and relates to the technical field of entropy oxide materials. The chemical formulaof the six-element high-entropy oxide powder material is (AlxCoCrFeMnNi)3O4, wherein the value of x ranges between 0.2 and 1. Raw materials comprise aluminum nitrate, cobalt nitrate, chromium nitrate, ferric nitrate, manganese nitrate and nickel nitrate, wherein the molar ratio of aluminum nitrate to the sum of the rest nitrates is (0.2-1):1. The preparation method comprises the steps of dissolving the nitrates, adding a proper amount of fuel, uniformly mixing, and carrying out low-temperature combustion to obtain the six-element spinel type high-specific-surface-area (AlxCoCrFeMnNi)3O4 high-entropy oxide nano-powder material. The six-element high-specific-surface-area (AlxCoCrFeMnNi)3O4 high-entropy oxide nano-powder prepared according to the method is used as a lithium ion battery negative electrode material, has relatively high specific capacity, excellent cycle characteristic, and is simple in preparation method and low in cost.

Description

technical field [0001] The invention relates to the technical field of high-entropy oxide materials, in particular to a six-element high-entropy oxide material for lithium-ion batteries and a preparation method thereof. Background technique [0002] Traditional lithium-ion negative electrode materials are generally graphite-like carbon materials, which is the most studied type of lithium-ion battery negative electrode materials, and is also the main negative electrode material used in commercial secondary lithium-ion batteries. However, graphite-based carbon materials have two prominent shortcomings as negative electrode materials: one is poor high-current charge-discharge performance, and due to its unique layered structure, it is easy to cause the graphite layer to fall off under high-current conditions, reducing its cycle life; Graphite carbon materials are used as negative electrode materials for lithium-ion batteries, and their theoretical specific capacity is only 372m...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H01M4/48H01M4/505H01M4/525
CPCH01M4/525H01M4/505H01M4/48Y02E60/10
Inventor 冒爱琴项厚政谢鸿翔俞海云郑翠红林娜
Owner ANHUI UNIVERSITY OF TECHNOLOGY
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