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A kind of magnesium iron hydride-graphite composite electrode material and its preparation method and application

A composite electrode and composite material technology, which is applied in the field of magnesium-iron hydride-graphite composite electrode materials and its preparation, can solve the problems of disappearance of hydride activity and poor reversibility, and achieve prevention of agglomeration, improvement of electrical conductivity, and controllable reaction Effect

Active Publication Date: 2020-06-19
SOUTH CHINA UNIV OF TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, the reversibility of the magnesium hydride conversion reaction is still poor, and the activity of the hydride basically disappears after more than twenty cycles.

Method used

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  • A kind of magnesium iron hydride-graphite composite electrode material and its preparation method and application
  • A kind of magnesium iron hydride-graphite composite electrode material and its preparation method and application
  • A kind of magnesium iron hydride-graphite composite electrode material and its preparation method and application

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0039] (1) In a glove box with 0.1MPa argon atmosphere, put magnesium powder and iron powder (with a purity of not less than 99wt.%) into a ball milling tank at a mass ratio of 2.2:1 and place the ball milling tank in a high-energy In the planetary ball mill (QM-3SP4), 6 MPa hydrogen was introduced, the ball-to-material ratio was 40:1, the ball mill speed was 500 rpm, running for 15 minutes and stopping for 15 minutes alternately, and ball milling for 20 hours in a hydrogen atmosphere.

[0040] (2) After the ball milling is completed, take the powder in an argon atmosphere glove box, transfer the powder to the autoclave, pass 9MPa hydrogen, and heat to 450℃ at a heating rate of 5K / min, and keep it for 20h to obtain Mg 2 FeH 6 powder.

[0041] (3) The Mg obtained in step (2) 2 FeH 6 The powder and graphite are put into the ball milling tank at a mass ratio of 9:1 and the ball milling tank is placed in a high-energy planetary ball mill (QM-3SP4), and 6MPa hydrogen is introduced. The b...

Embodiment 2

[0049] (1) In a glove box with 0.1MPa argon atmosphere, put magnesium powder and iron powder (with a purity of not less than 99wt.%) into a ball milling tank at a mass ratio of 2.2:1 and place the ball milling tank in a high-energy In the planetary ball mill (QM-3SP4), 6 MPa hydrogen was introduced, the ball-to-material ratio was 40:1, the ball mill speed was 500 rpm, running for 15 minutes and stopping for 15 minutes alternately, and ball milling for 20 hours in a hydrogen atmosphere.

[0050] (2) After the ball milling is completed, take the powder in an argon atmosphere glove box, transfer the powder to the autoclave, pass 9MPa hydrogen, and heat to 450℃ at a heating rate of 5K / min, and keep it for 20h to obtain Mg 2 FeH 6 powder.

[0051] (3) The Mg obtained in step (2) 2 FeH 6 The powder and graphite are put into the ball mill tank at a mass ratio of 8.5:1.5, and the ball mill tank is placed in a high-energy planetary ball mill (QM-3SP4), and 6MPa hydrogen is introduced. The ba...

Embodiment 3

[0058] (1) In a glove box with 0.1MPa argon atmosphere, put magnesium powder and iron powder (with a purity of not less than 99wt.%) into a ball milling tank at a mass ratio of 2.2:1 and place the ball milling tank in a high-energy In the planetary ball mill (QM-3SP4), 6 MPa hydrogen was introduced, the ball-to-material ratio was 40:1, the ball mill speed was 500 rpm, running for 15 minutes and stopping for 15 minutes alternately, and ball milling for 20 hours in a hydrogen atmosphere.

[0059] (2) After the ball milling is completed, take the powder in an argon atmosphere glove box, transfer the powder to the autoclave, pass 9MPa hydrogen, and heat to 450℃ at a heating rate of 5K / min, and keep it for 20h to obtain Mg 2 FeH 6 powder.

[0060] (3) The Mg obtained in step (2) 2 FeH 6 The powder and graphite are put into the ball mill tank at a mass ratio of 8:2, and the ball mill tank is placed in a high-energy planetary ball mill (QM-3SP4), and 6MPa hydrogen is introduced. The ball-t...

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Abstract

The invention belongs to the field of electrode materials and discloses a magnesium iron hydride-graphite composite electrode material and a preparation method and application thereof. The preparationmethod comprises the steps: mixing magnesium powder and iron powder, ball milling under the hydrogen atmosphere, then performing thermal treatment at 400 to 500 DEG C and ball milling a mixture and graphite under the hydrogen atmosphere to obtain an Mg2FeH6-graphite composite material; evenly mixing the Mg2FeH6-graphite composite material with a conductive agent and a binding agent, coating on acopper foil to manufacture an electrode plate, vacuum drying, then preparing a metal oxide protective film on the surface of the electrode plate through magnetron sputtering to obtain the magnesium iron hydride-graphite composite electrode material. According to the magnesium iron hydride-graphite composite electrode material disclosed by the invention, a method that multiphase composite ball milling and magnetron sputtering are combined is utilized; thus, electrode reversibility is improved, and electrode circulating performance is improved.

Description

Technical field [0001] The invention belongs to the field of electrode materials, and specifically relates to a magnesium-iron hydride-graphite composite electrode material and a preparation method and application thereof. Background technique [0002] As a new type of energy storage device, lithium ion battery has the advantages of high voltage, high specific energy, low self-discharge, good cycle performance, no memory effect and green environmental protection. It is currently the most promising high-efficiency secondary battery and development The fastest chemical energy storage power supply. With the development of strategic emerging industries such as information technology, power vehicles, and aerospace, higher requirements have been placed on the energy density and safety performance of lithium-ion batteries. However, due to the disadvantages of low-volume specific capacity and quality of existing electrode materials, commercial lithium electronic batteries cannot meet th...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): H01M4/36H01M4/583H01M4/62H01M4/46H01M4/525H01M10/0525C01B32/20
CPCC01B32/20H01M4/362H01M4/46H01M4/525H01M4/583H01M4/62H01M10/0525Y02E60/10
Inventor 王辉阳朔欧阳柳章朱敏刘江文
Owner SOUTH CHINA UNIV OF TECH