A kind of graphene-ceo2 base ceramic composite material and preparation method thereof

A ceramic composite material and composite material technology, applied in the field of graphene-CeO2 based ceramic composite material and its preparation, can solve the problems of reducing the open circuit voltage of the battery, reducing the output power density of the battery, etc., to increase the three-phase interface, electrochemical activity The effect of improving and improving cycle stability

Active Publication Date: 2014-10-29
SHAANXI COAL & CHEM TECH INST
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  • Claims
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Problems solved by technology

Undoped CeO 2 The ionic conductivity is about 310×10 -4 S / cm, doped CeO 2 The conductivity of the base electrolyte at medium temperature is about 10 -3 S / cm-10 -1 S / cm, but doped with CeO 2 Partial Ce of base electrolyte under reducing atmosphere 4+ easily reduced to Ce 3+ And generate electronic conductance, reduce the open circuit voltage of the battery, and reduce the output power density of the battery

Method used

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  • A kind of graphene-ceo2 base ceramic composite material and preparation method thereof
  • A kind of graphene-ceo2 base ceramic composite material and preparation method thereof

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preparation example Construction

[0024] Preparation of Graphene-CeO of the present invention 2 A simple method for matrix ceramic composite materials, including the following steps:

[0025] 1) Preparation of graphene oxide-metal oxide composites:

[0026] Using the solid phase reaction method, 40-99.85 parts by weight of cerium salt (cerium chloride, cerium nitrate, cerium sulfate, cerium carbonate, cerium acetate, cerium oxalate), 0.03-40 parts of Ln series additives ( The Ln series metal salt is the chloride, nitrate, sulfate, carbonate, acetate or oxalate of lanthanum La, praseodymium Pr, neodymium Nd, samarium Sm or gadolinium Gd; the Ln series metal oxide is lanthanum La, Oxides of praseodymium Pr, neodymium Nd, samarium Sm or gadolinium Gd) are mixed with 0.1-30 parts by weight of graphene oxide, and fully ground in a ball mill to obtain a composite material;

[0027] 2) Preparation of graphene-CeO 2 Base Ceramic Composites:

[0028] Add 5-45 parts by weight of organic adhesive solvent (PVB and n-b...

Embodiment 1

[0031] In this embodiment, lanthanum oxide is used as an auxiliary agent, and 80 mg graphene oxide, 360 mg CeO 2 and 40mgLa 2 o 3 Mix, and use ethanol as a solvent to fully grind in a ball mill to obtain graphene oxide-CeO 2 Base Composite 468mg. Then add 120mg of organic adhesive (PVB and n-butanol solvent with a weight ratio of 1:1) to the powder and mix well. Among the raw materials, the parts by weight of graphene oxide, cerium oxide, lanthanum oxide and organic adhesive are 20, 90, 10 and 30 respectively.

[0032] After drying, use dry pressing method to press at 120MPa, place in 100ml / min H 2 / He mixed gas vacuum tube furnace, H in the mixed gas 2 The proportion is 7vol.%. First pass the mixed gas for 20 minutes to remove active substances such as air, oxygen, and water in the cavity, and then raise the temperature to 1450°C at a rate of 8°C / min and sinter for 4 hours to form a strip with a size of about 1.5×4×20mm Graphene-CeO2 Based ceramic composites, the volum...

Embodiment 2

[0037] In this embodiment, praseodymium oxide is used as an auxiliary agent, and 0.5 mg graphene oxide, 400 mg CeO 2 and 100mg Pr 2 o 3 Mix, and use ethanol as a solvent to fully grind in a ball mill to obtain graphene oxide-CeO 2 Base composite 488mg. Then add 25mg of organic adhesive (PVB and n-butanol solvent with a weight ratio of 1.5:1) to the powder and mix well. Among the raw materials, the parts by weight of graphene oxide, cerium oxide, praseodymium oxide and organic adhesive are 0.1, 80, 20 and 5 respectively.

[0038] After drying, use dry pressing method to press at 150MPa, place in 250ml / min H 2 / N 2 In the vacuum tube furnace with mixed gas, H in the mixed gas 2 The proportion is 0.1vol.%. First pass the mixed gas for 20 minutes to remove active substances such as air, oxygen, and water in the cavity, and then raise the temperature to 1600°C at a rate of 10°C / min and sinter for 2 hours to form a strip with a size of about 1.5×4×20mm Graphene-CeO 2 Based ...

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Abstract

The invention discloses a preparation method of a graphene-CeO2 based ceramic composite material. The preparation method comprises the following steps: 1) sufficiently grinding cerium salts, additives and graphene oxide uniformly in a ball mill to obtain a graphene-metal oxide composite material; and 2) adding an organic adhesive solvent into the graphene-metal oxide composite material, and sufficiently mixing and grinding, dryly pressing into strip composite samples through use of a dry-press method, putting the strip composite samples into a vacuum tubular furnace, letting in a mixed gas of a certain ratio, controlling sintering conditions, and then cooling to the room temperature to obtain the graphene-CeO2 based ceramic composite material. Through improvement of dispersibility of CeO2-ceramic oxide particles, cycle stability of the composite material is increased. Through increase of the three-phase interface among the ceramic oxide particles, the electrochemical activity of the composite material is improved. The preparation processes has the advantages of simple operation, no pollution, good repeatability and easy large-scale magnification.

Description

technical field [0001] The present invention relates to a graphene-CeO 2 A matrix ceramic composite material and a preparation method thereof belong to the technical field of inorganic composite material preparation. Background technique [0002] In 2004, Andre Geim and Konstantin Novoselov, physicists at the University of Manchester, UK, jointly won the 2010 Nobel Prize in Physics for their "pioneering experiments on two-dimensional graphene materials". . Graphene is a single-layer carbon atom surface material peeled off from graphite materials. It is a two-dimensional structure of carbon and a "super material". . Adding graphene to plastics, rubber, coatings and other substrates can greatly enhance product performance, such as strength, toughness, electrical conductivity, and heat transfer. The application in the field of composite materials is currently one of the largest industrial applications of graphene. one. Graphene oxide is an important derivative of graphene,...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C04B35/50C04B35/622
Inventor 张云付东升杨阳
Owner SHAANXI COAL & CHEM TECH INST
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