A kind of ceramic material with high electrical energy storage efficiency and preparation method thereof

Abstract

The invention discloses a ceramic material with high electric energy storage efficiency and a preparation method thereof, belongs to the technical field of electronic ceramic materials, overcomes the problems of low electric energy storage efficiency and serious energy waste of energy storage ceramics in the prior art, and the prepared product electric energy High storage efficiency, chemical uniformity and good electrical stability. The electronic ceramic material chemical composition of the present invention is (1-x) ((1-y) BaTiO 3 -y(Bi 0.5 Na 0.5 )TiO 3 )‑xSr(Sc 0.5 Nb 0.5 )O 3 , where x is 0.05‑0.15 and y is 0.35. The product of the invention has high repeatability, uniform internal grain size, high chemical uniformity and electrical uniformity, and exhibits high energy storage efficiency. The energy storage ceramic material prepared by the present invention has a maximum energy storage efficiency of 91% and an energy storage density of 1.63 J / cm³ when the applied electric field strength is 175 kV / cm3. The energy storage ceramic material prepared by the invention can be applied to high-power and high-stability electronic pulse components, and has great practical value and economic value.

Description

technical field

[0001] The invention belongs to the technical field of functional ceramic materials, and in particular relates to a ceramic material with high electric energy storage efficiency and a preparation method thereof. Background technique

[0002] Pulse power capacitors made of energy storage ceramic materials have the advantages of high power density, fast charge and discharge speed, anti-cycle aging, and are suitable for extreme environments such as high temperature and high pressure, and play a key role in power electronic systems. High energy storage density ceramic capacitors can be used as inverter equipment for new energy power generation systems or electric vehicles; they can supply ultra-high load pulse currents such as tanks, electromagnetic guns, electrified launch platforms, and integrated all-electric propulsion ships in a very short time; It is used as a driving element for high-power transmitting devices such as particle accelerators, microwaves, las...

Examples

preparation example Construction

[0025] The invention relates to a ceramic material with high electric energy storage efficiency and a preparation method thereof. The chemical composition of the formula is (1-x)((1-y)BaTiO 3 -y(Bi 0.5 Na 0.5 )TiO 3 )-xSr(Sc 0.5 Nb 0.5 )O 3 , prepared by solid-state sintering method.

[0026] The method of the present invention comprises the following steps:

[0027] 1. Weigh raw materials

[0028] According to (1-x)((1-y)BaTiO 3 -y(Bi 0.5 Na 0.5 )TiO 3 )-xSr(Sc 0.5 Nb 0.5 )O 3 Calculate the stoichiometric ratio of the chemical composition, and weigh the high-purity Bi 2 o 3 、Na 2 CO 3 、BaCO 3 , SrCO 3 、Sc 2 o 3 、TiO 2 and Nb 2 o 5 raw powder.

[0029] 2. Ball mill drying:

[0030] Put the mixed powder of raw materials in a ball mill jar, add absolute ethanol, ball mill on a planetary ball mill for 24 h, then take it out, and put it in a dry box for 80 o C drying.

[0031] 3. Pre-sintering:

[0032] Put the powder dried by the ball mill into a high...

Embodiment 1

[0039] Set the chemical composition to 0.90 (0.65BaTiO 3 -0.35 (Bi 0.5 Na 0.5 )TiO 3 ) -0.10Sr(Sc 0.5 Nb 0.5 )O 3 According to the formula of energy storage ceramics, high-purity raw materials were weighed according to the stoichiometric ratio, anhydrous ethanol was added, ball milled in a planetary ball mill for 24 h, and then dried to obtain a mixture. The mixture is then placed in a sintering furnace for sintering at 900 o Pre-sintered at C for 2 h, cooled naturally; after the pre-sintered ceramic powder was milled into powder twice, 7 wt% polyvinyl alcohol solution was added, mixed evenly in a mortar, and then pressed into a diameter of 12 mm by molding. A disc with a thickness of 1.5 mm. Place the pressed disc in a sintering furnace for sintering at 600 o C heat preservation 4 hours debinding, with 3 o The heating rate of C / min increases the temperature to 1170 o C sintering, heat preservation 4 h. After sintering, it is naturally cooled to room temperature wit...

Embodiment 2

[0042] Change the chemical composition to 0.65BaTiO 3 -0.35 (Bi 0.5 Na 0.5 )TiO 3 Weigh the high-purity raw materials according to the stoichiometric ratio, add absolute ethanol, ball mill in a planetary ball mill for 24 h, and dry to obtain the mixture. The mixture is then placed in a sintering furnace for sintering at 900 o Pre-sintered at C for 2 h, cooled naturally; after the pre-sintered ceramic powder was milled into powder twice, 7 wt% polyvinyl alcohol solution was added, mixed evenly in a mortar, and then pressed into a diameter of 12 mm by molding. A disc with a thickness of 1.5 mm. Place the pressed disc in a sintering furnace for sintering at 600 o C heat preservation 4 hours debinding, with 3 o The heating rate of C / min increases the temperature to 1160 o C sintering, heat preservation 4 h. After sintering, it is naturally cooled to room temperature with the furnace to obtain energy storage ceramics.

[0043] Using the Agilent ferroelectric analyzer to me...

technical field

[0001] The invention belongs to the technical field of functional ceramic materials, and in particular relates to a ceramic material with high electric energy storage efficiency and a preparation method thereof. Background technique

[0002] Pulse power capacitors made of energy storage ceramic materials have the advantages of high power density, fast charge and discharge speed, anti-cycle aging, and are suitable for extreme environments such as high temperature and high pressure, and play a key role in power electronic systems. High energy storage density ceramic capacitors can be used as inverter equipment for new energy power generation systems or electric vehicles; they can supply ultra-high load pulse currents such as tanks, electromagnetic guns, electrified launch platforms, and integrated all-electric propulsion ships in a very short time; It is used as a driving element for high-power transmitting devices such as particle accelerators, microwaves, las...

Examples

preparation example Construction

[0025] The invention relates to a ceramic material with high electric energy storage efficiency and a preparation method thereof. The chemical composition of the formula is (1-x)((1-y)BaTiO 3 -y(Bi 0.5 Na 0.5 )TiO 3 )-xSr(Sc 0.5 Nb 0.5 )O 3 , prepared by solid-state sintering method.

[0026] The method of the present invention comprises the following steps:

[0027] 1. Weigh raw materials

[0028] According to (1-x)((1-y)BaTiO 3 -y(Bi 0.5 Na 0.5 )TiO 3 )-xSr(Sc 0.5 Nb 0.5 )O 3 Calculate the stoichiometric ratio of the chemical composition, and weigh the high-purity Bi 2 o 3 、Na 2 CO 3 、BaCO 3 , SrCO 3 、Sc 2 o 3 、TiO 2 and Nb 2 o 5 raw powder.

[0029] 2. Ball mill drying:

[0030] Put the mixed powder of raw materials in a ball mill jar, add absolute ethanol, ball mill on a planetary ball mill for 24 h, then take it out, and put it in a dry box for 80 o C drying.

[0031] 3. Pre-sintering:

[0032] Put the powder dried by the ball mill into a high...

Embodiment 1

[0039] Set the chemical composition to 0.90 (0.65BaTiO 3 -0.35 (Bi 0.5 Na 0.5 )TiO 3 ) -0.10Sr(Sc 0.5 Nb 0.5 )O 3 According to the formula of energy storage ceramics, high-purity raw materials were weighed according to the stoichiometric ratio, anhydrous ethanol was added, ball milled in a planetary ball mill for 24 h, and then dried to obtain a mixture. The mixture is then placed in a sintering furnace for sintering at 900 o Pre-sintered at C for 2 h, cooled naturally; after the pre-sintered ceramic powder was milled into powder twice, 7 wt% polyvinyl alcohol solution was added, mixed evenly in a mortar, and then pressed into a diameter of 12 mm by molding. A disc with a thickness of 1.5 mm. Place the pressed disc in a sintering furnace for sintering at 600 o C heat preservation 4 hours debinding, with 3 o The heating rate of C / min increases the temperature to 1170 o C sintering, heat preservation 4 h. After sintering, it is naturally cooled to room temperature wit...

Embodiment 2

[0042] Change the chemical composition to 0.65BaTiO 3 -0.35 (Bi 0.5 Na 0.5 )TiO 3 Weigh the high-purity raw materials according to the stoichiometric ratio, add absolute ethanol, ball mill in a planetary ball mill for 24 h, and dry to obtain the mixture. The mixture is then placed in a sintering furnace for sintering at 900 o Pre-sintered at C for 2 h, cooled naturally; after the pre-sintered ceramic powder was milled into powder twice, 7 wt% polyvinyl alcohol solution was added, mixed evenly in a mortar, and then pressed into a diameter of 12 mm by molding. A disc with a thickness of 1.5 mm. Place the pressed disc in a sintering furnace for sintering at 600 o C heat preservation 4 hours debinding, with 3 o The heating rate of C / min increases the temperature to 1160 o C sintering, heat preservation 4 h. After sintering, it is naturally cooled to room temperature with the furnace to obtain energy storage ceramics.

[0043] Using the Agilent ferroelectric analyzer to me...

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