Rare earth hydride-carbon nano composite material and preparation method and application thereof

A rare earth hydride, composite material technology, applied in nanotechnology, nanotechnology, nanotechnology for materials and surface science, etc., can solve the problems of unfavorable production and commercial application, complex preparation method, low yield, etc., Achieve the effect of low cost, easy to scale up production and high yield

Active Publication Date: 2017-07-11
PEKING UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, the preparation methods of these negative electrode materials are complicated, the cost is high, and the yield is low, which is not conducive to large-scale production and commercial application.

Method used

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  • Rare earth hydride-carbon nano composite material and preparation method and application thereof
  • Rare earth hydride-carbon nano composite material and preparation method and application thereof
  • Rare earth hydride-carbon nano composite material and preparation method and application thereof

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0030] YH 3 - Graphite weight ratio of 1:2 nanocomposite

[0031] (1) Take 2g of metal Y block, polish it to remove the oxide layer on the surface, put it in a tube furnace, and react with hydrogen absorption for 3 hours at 350°C and 3MPa hydrogen pressure to obtain YH 3 powder.

[0032] (2) Take 200mg YH 3 Powder, mixed with 400 mg of 300-mesh graphite powder (purchased from Sinopharm Group), added 30 g of zirconia balls, filled the ball mill with 0.4 MPa of hydrogen, and milled for 150 min with a planetary ball mill at a speed of 200 rpm.

[0033] (3) Use a vacuum pump to evacuate the ball mill jar to a vacuum, put it in a glove box filled with argon and open it, take out the obtained mixed material with a spoon, and store it in the glove box.

[0034] YH obtained after the above three steps 3 - X-ray diffraction and transmission electron microscopy of graphite nanocomposites such as figure 1 with figure 2 As can be seen from the figure, YH 3 And the crystallinity of...

Embodiment 2

[0036] YH 3 - Expanded graphite weight ratio of 1:0.2 nanocomposite

[0037] (1) Take 2g metal Y block, polish it to remove the oxide layer on the surface, put it in a tube furnace, and react with hydrogen absorption for 4 hours at 350°C and 4MPa hydrogen pressure to obtain YH 3 powder.

[0038] (2) Take 500mg YH 3 Powder, mixed with 100 mg of 200-mesh expanded graphite powder (purchased from Sinopharm), added 30 g of zirconia balls, filled the ball mill with 0.4 MPa of hydrogen, and milled for 60 min with a planetary ball mill at a speed of 200 rpm.

[0039] (3) Use a vacuum pump to evacuate the ball mill jar to a vacuum, put it in a glove box filled with argon and open it, take out the obtained mixed material with a spoon, and store it in the glove box.

[0040] YH obtained after the above three steps 3 - YH in expanded graphite nanocomposites 3 The crystallinity is good, the particle size is about 200nm, and it is evenly mixed with expanded graphite.

Embodiment 3

[0042] L 3 - Graphite weight ratio 1:1 nanocomposite

[0043] (1) Take 2g of metal La block, polish off the oxide layer on the surface, put it in a tube furnace, and react with hydrogen absorption for 3 hours at 350°C and 3.5MPa hydrogen pressure to obtain LaH 3 powder.

[0044] (2) Take 200mg LaH 3 Powder, mixed with 200 mg of 300-mesh graphite powder (purchased from Sinopharm), added 18 g of zirconia balls, filled the ball mill with 0.4 MPa of hydrogen, and milled for 300 min with a planetary ball mill at a speed of 250 rpm.

[0045] (3) Use a vacuum pump to evacuate the ball mill jar to a vacuum, put it in a glove box filled with argon and open it, take out the obtained mixed material with a spoon, and store it in the glove box.

[0046] LaH obtained after the above three steps 3 -LaH in graphite nanocomposites 3 Good crystallinity, particle size about 500nm, mixed with graphite evenly.

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Abstract

The present invention provides a rare earth hydride-carbon nano composite material and a preparation method and application thereof, a rare earth hydride is prepared by high temperature and high pressure, and the rare earth hydride and a carbon material are uniformly mixed in a certain proportion at room temperature by low rotation speed ball milling. The method is simple and quick, high in yield, low in cost, easy to enlarge, the reaction product is mixed evenly, particle size is small, purity is high, and the reaction product has a specific synergistic effect and has high lithium storage specific capacity. The rare earth hydride-carbon nano composite material has remarkable advantages, and has great industrial application prospects.

Description

technical field [0001] The invention belongs to the field of lithium-ion battery electrode materials, and relates to a rare earth hydride-carbon nanocomposite material and a preparation method and application thereof. Background technique [0002] As an important chemical energy storage technology, lithium-ion batteries have been extensively researched and developed in the past two decades due to their advantages such as high energy storage density, long cycle life, and low self-discharge rate, and are now widely used for various portable devices. [0003] At present, the most common anode material for commercial lithium-ion batteries is graphite anode material, which is low in cost, but it is easy to form SEI (Solid Electrolyte Interface) layer with electrolyte during charging, which reduces its Coulombic efficiency, and the natural graphite material theory The low lithium storage capacity leads to the fact that the energy density of lithium ions does not meet its long-ter...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H01M4/36H01M4/58H01M4/587H01M10/0525B82Y30/00
CPCB82Y30/00H01M4/364H01M4/58H01M4/587H01M10/0525Y02E60/10
Inventor 郑鑫遥常兴华郑捷李星国
Owner PEKING UNIV
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