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Carbon-clad alloy material and fabrication method and application thereof

A technology of alloy materials and carbon coating, which is applied in the field of carbon coating alloy materials and their preparation, can solve the problems of difficult control and cumbersome preparation, and achieve the effects of avoiding pulverization and falling off, improving performance, and ensuring uniformity and stability

Active Publication Date: 2016-07-27
PEKING UNIV SHENZHEN GRADUATE SCHOOL
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, for traditional carbon-coated alloy composite materials with core-shell structure, the carbon coating layer needs to be processed in advance to reserve space during preparation, and the preparation is cumbersome and difficult to control.

Method used

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  • Carbon-clad alloy material and fabrication method and application thereof
  • Carbon-clad alloy material and fabrication method and application thereof
  • Carbon-clad alloy material and fabrication method and application thereof

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0035] The carbon-coated alloy material in this example is a carbon-coated Sn—Ni alloy nanorod. Sn-Ni alloy nanorods are prepared by electrodeposition, and the morphology is nanorod-shaped. The carbon source used in the carbon coating layer is polycarbonate (abbreviated as PC) template. The specific preparation method is as follows:

[0036] Preparation of Sn-Ni nanorods: First, a dense copper film of four to five hundred nanometers is deposited on one side of Whatman's PC template by thermal evaporation to make it conductive, and then it is pasted with a water-based conductive adhesive On the copper foil, the evaporated copper film is opposite to the copper foil, and is in close contact, and the copper foil can be used as a current collector. After pasting and drying, fix it with copper tape to prevent it from falling off during electrodeposition in aqueous solution. The back of the copper foil is covered with a plastic film so that the back cannot be deposited. The plating ...

Embodiment 2

[0042] The carbon-coated alloy material in this example is carbon-coated Sn—Fe alloy nanoparticles. The specific preparation method is as follows:

[0043] Preparation of Sn-Fe alloy nanoparticles: Weigh metal micron Fe powder and Sn powder with a mass ratio of 60:40, mix them evenly, and briquette them. Install the raw material block in the DC arc plasma equipment, as the anode. Using a W rod as a cathode, fill it with a mixed gas of 0.03MPa argon and 0.04MPa hydrogen, start and stabilize the arc, and undergo evaporation, condensation, passivation and other processes to obtain Sn-Fe alloy nanoparticles.

[0044] Carbon coating: Weigh 20% to 30% of the weight of glucose of the prepared Sn-Fe alloy nanoparticles, place it in a mortar, add a small amount of water dropwise until the glucose dissolves, and then add a small amount of ethanol to make a glucose slurry; The prepared Sn-Fe alloy nanoparticles were added to the prepared glucose slurry, thoroughly ground, and then plac...

Embodiment 3

[0048] The carbon-coated alloy material in this example is carbon-coated Sn—Sb—Cu ternary alloy particles. The specific preparation method is as follows:

[0049] Preparation of Sn-Sb-Cu ternary alloy particles: Weigh Sn and Sb metal powders with a mass ratio of 1:1 and melt them into Sn-Sb alloys in a tube furnace, then take out and pulverize them into small particles of about 100 microns, and then accurately Sn-Sb-Cu ternary alloys can be obtained by weighing Cu powder with the same mass as Sn and Sb and the small Sn-Sb alloy particles prepared above, mixing them evenly, and ball milling in a planetary ball mill at 200r / min for 60h.

[0050] Carbon coating: Weigh 20% to 30% of the weight of glucose of the prepared Sn-Ni-Cu alloy nanoparticles, put it in a mortar, add a small amount of water dropwise until the glucose dissolves, and then add a small amount of ethanol to make a glucose slurry ; The prepared Sn-Sb-Cu ternary alloy particles were added to the prepared glucose s...

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Abstract

The invention discloses a carbon-clad alloy material and a fabrication method and application thereof. In the carbon-clad alloy material disclosed by the invention, alloy is alloy containing transition metal; the mode of carbon cladding is as follows: carbon and the transition metal on the surface of the alloy form a solid solution body in a high temperature, carbon atoms are slowly precipitated on the surface of the solid solution body of the carbon and the transition metal in a layered manner during cooling to form a carbon-clad layer with a layered structure, and the carbon-clad alloy material is obtained; and the transition metal is at least one of Fe, Ni, Co and Cu. The carbon-clad alloy material disclosed by the invention is provided with a highly-graphitized layered carbon-clad layer, the carbon-clad layer has flexibility and can be expanded with an alloy material of a core, a stable hollow cavity structure is maintained after expansion, an independently-closed region with an enough buffer space can be provided for the alloy when the carbon-clad layer is used as a battery anode material, so that the alloy can fully develop the function, and the application performance of the anode material is effectively improved.

Description

technical field [0001] The present application relates to the field of battery anode materials, in particular to a carbon-coated alloy material and its preparation method and application. Background technique [0002] With the rapid development of society, human beings' demand for energy is getting stronger and stronger, and all kinds of fossil energy are far from meeting human needs, and the excessive use of fossil energy has also brought serious environmental problems to the world. According to relevant data, the world's most dependent core energy is on the verge of depletion, and now humans urgently need a high-performance chemical power source, and lithium-ion batteries are currently the best choice. At the same time, as human beings enter the information age with the rapid development of electronic information, various electronic devices have also put forward higher requirements for high-performance power supplies, and the slow development of battery technology has also...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H01M4/38H01M4/62H01M10/0525H01M10/054
CPCH01M4/38H01M4/625H01M10/0525H01M10/054Y02E60/10
Inventor 彭灏李锐潘锋
Owner PEKING UNIV SHENZHEN GRADUATE SCHOOL
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