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Magnesium iron hydride-graphite composite electrode material and preparation method and application thereof

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 hydride activity loss and poor reversibility, and achieve the goals of preventing agglomeration, improving electrical conductivity, and improving reversibility Effect

Active Publication Date: 2018-09-11
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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  • Magnesium iron hydride-graphite composite electrode material and preparation method and application thereof
  • Magnesium iron hydride-graphite composite electrode material and preparation method and application thereof
  • Magnesium iron hydride-graphite composite electrode material and preparation method and application thereof

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

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

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

[0041] (3) Mg obtained by step (2) 2 FeH 6The powder and graphite are put into a ball milling jar with a mass ratio of 9:1, and the ball milling jar is placed in a high-energy planetary ball mi...

Embodiment 2

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

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

[0051] (3) Mg obtained by step (2) 2 FeH 6 The powder and graphite are put into a ball milling jar with a mass ratio of 8.5:1.5, and the ball milling jar is placed in a high-energy planetary ba...

Embodiment 3

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

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

[0060] (3) Mg obtained by step (2) 2 FeH 6 The powder and graphite are put into a ball milling jar with a mass ratio of 8:2, and the ball milling jar is placed in a high-energy planetary ball m...

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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 in particular 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 is currently the most promising high-efficiency secondary battery and development due to its advantages of high voltage, high specific energy, low self-discharge, good cycle performance, no memory effect, and environmental protection. The fastest chemical energy storage power source. With the development of strategic emerging industries such as information technology, power vehicles and aerospace, higher requirements are placed on the energy density and safety performance of lithium-ion batteries. However, due to the defects of existing electrode materials in terms of quality and low volume-specific capacity, commercialized lithium-ion batteries cannot meet the appl...

Claims

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Application Information

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Patent Type & Authority Applications(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
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