CN107935586B - Potassium niobate modified BT-KBT-based energy storage ceramic and preparation method thereof - Google Patents
Potassium niobate modified BT-KBT-based energy storage ceramic and preparation method thereof Download PDFInfo
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- CN107935586B CN107935586B CN201711115394.5A CN201711115394A CN107935586B CN 107935586 B CN107935586 B CN 107935586B CN 201711115394 A CN201711115394 A CN 201711115394A CN 107935586 B CN107935586 B CN 107935586B
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- 239000000919 ceramic Substances 0.000 title claims abstract description 87
- 238000004146 energy storage Methods 0.000 title claims abstract description 59
- UKDIAJWKFXFVFG-UHFFFAOYSA-N potassium;oxido(dioxo)niobium Chemical compound [K+].[O-][Nb](=O)=O UKDIAJWKFXFVFG-UHFFFAOYSA-N 0.000 title claims abstract description 50
- 238000002360 preparation method Methods 0.000 title claims abstract description 22
- 239000000843 powder Substances 0.000 claims abstract description 76
- BWHMMNNQKKPAPP-UHFFFAOYSA-L potassium carbonate Chemical compound [K+].[K+].[O-]C([O-])=O BWHMMNNQKKPAPP-UHFFFAOYSA-L 0.000 claims abstract description 48
- GWEVSGVZZGPLCZ-UHFFFAOYSA-N Titan oxide Chemical compound O=[Ti]=O GWEVSGVZZGPLCZ-UHFFFAOYSA-N 0.000 claims abstract description 46
- 239000000126 substance Substances 0.000 claims abstract description 37
- 229910010293 ceramic material Inorganic materials 0.000 claims abstract description 33
- 229910010252 TiO3 Inorganic materials 0.000 claims abstract description 29
- 238000000498 ball milling Methods 0.000 claims abstract description 25
- 229910000027 potassium carbonate Inorganic materials 0.000 claims abstract description 24
- 239000004408 titanium dioxide Substances 0.000 claims abstract description 23
- 229910000416 bismuth oxide Inorganic materials 0.000 claims abstract description 13
- TYIXMATWDRGMPF-UHFFFAOYSA-N dibismuth;oxygen(2-) Chemical compound [O-2].[O-2].[O-2].[Bi+3].[Bi+3] TYIXMATWDRGMPF-UHFFFAOYSA-N 0.000 claims abstract description 13
- 238000005245 sintering Methods 0.000 claims abstract description 13
- ZKATWMILCYLAPD-UHFFFAOYSA-N niobium pentoxide Inorganic materials O=[Nb](=O)O[Nb](=O)=O ZKATWMILCYLAPD-UHFFFAOYSA-N 0.000 claims abstract description 12
- URLJKFSTXLNXLG-UHFFFAOYSA-N niobium(5+);oxygen(2-) Chemical compound [O-2].[O-2].[O-2].[O-2].[O-2].[Nb+5].[Nb+5] URLJKFSTXLNXLG-UHFFFAOYSA-N 0.000 claims abstract description 12
- 238000000034 method Methods 0.000 claims abstract description 9
- 239000000463 material Substances 0.000 claims abstract description 4
- 238000002156 mixing Methods 0.000 claims description 54
- AYJRCSIUFZENHW-UHFFFAOYSA-L barium carbonate Chemical compound [Ba+2].[O-]C([O-])=O AYJRCSIUFZENHW-UHFFFAOYSA-L 0.000 claims description 22
- 229910003334 KNbO3 Inorganic materials 0.000 claims description 12
- 229910002113 barium titanate Inorganic materials 0.000 claims description 11
- 239000008367 deionised water Substances 0.000 claims description 11
- 229910021641 deionized water Inorganic materials 0.000 claims description 11
- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Chemical compound O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 claims description 11
- 239000000203 mixture Substances 0.000 claims description 2
- 238000004321 preservation Methods 0.000 claims 1
- 238000001035 drying Methods 0.000 abstract description 10
- AYJRCSIUFZENHW-DEQYMQKBSA-L barium(2+);oxomethanediolate Chemical compound [Ba+2].[O-][14C]([O-])=O AYJRCSIUFZENHW-DEQYMQKBSA-L 0.000 abstract description 2
- 239000002994 raw material Substances 0.000 abstract description 2
- 238000010532 solid phase synthesis reaction Methods 0.000 abstract description 2
- 238000000465 moulding Methods 0.000 abstract 1
- 230000002194 synthesizing effect Effects 0.000 abstract 1
- 230000010287 polarization Effects 0.000 description 8
- 239000003990 capacitor Substances 0.000 description 4
- 239000012071 phase Substances 0.000 description 4
- 229910002112 ferroelectric ceramic material Inorganic materials 0.000 description 3
- 239000010955 niobium Substances 0.000 description 3
- 230000015556 catabolic process Effects 0.000 description 2
- 239000003985 ceramic capacitor Substances 0.000 description 2
- 239000013078 crystal Substances 0.000 description 2
- 239000003989 dielectric material Substances 0.000 description 2
- 229910052758 niobium Inorganic materials 0.000 description 2
- GUCVJGMIXFAOAE-UHFFFAOYSA-N niobium atom Chemical compound [Nb] GUCVJGMIXFAOAE-UHFFFAOYSA-N 0.000 description 2
- RTAQQCXQSZGOHL-UHFFFAOYSA-N Titanium Chemical compound [Ti] RTAQQCXQSZGOHL-UHFFFAOYSA-N 0.000 description 1
- 230000009286 beneficial effect Effects 0.000 description 1
- 238000006243 chemical reaction Methods 0.000 description 1
- RKTYLMNFRDHKIL-UHFFFAOYSA-N copper;5,10,15,20-tetraphenylporphyrin-22,24-diide Chemical compound [Cu+2].C1=CC(C(=C2C=CC([N-]2)=C(C=2C=CC=CC=2)C=2C=CC(N=2)=C(C=2C=CC=CC=2)C2=CC=C3[N-]2)C=2C=CC=CC=2)=NC1=C3C1=CC=CC=C1 RKTYLMNFRDHKIL-UHFFFAOYSA-N 0.000 description 1
- 230000000694 effects Effects 0.000 description 1
- 230000005621 ferroelectricity Effects 0.000 description 1
- 238000011031 large-scale manufacturing process Methods 0.000 description 1
- 230000009022 nonlinear effect Effects 0.000 description 1
- 238000003860 storage Methods 0.000 description 1
- 239000002887 superconductor Substances 0.000 description 1
- 239000010936 titanium Substances 0.000 description 1
- 229910052719 titanium Inorganic materials 0.000 description 1
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- C04B35/46—Shaped ceramic products characterised by their composition; Ceramics compositions; Processing powders of inorganic compounds preparatory to the manufacturing of ceramic products based on oxide ceramics based on titanium oxides or titanates
- C04B35/462—Shaped ceramic products characterised by their composition; Ceramics compositions; Processing powders of inorganic compounds preparatory to the manufacturing of ceramic products based on oxide ceramics based on titanium oxides or titanates based on titanates
- C04B35/465—Shaped ceramic products characterised by their composition; Ceramics compositions; Processing powders of inorganic compounds preparatory to the manufacturing of ceramic products based on oxide ceramics based on titanium oxides or titanates based on titanates based on alkaline earth metal titanates
- C04B35/468—Shaped ceramic products characterised by their composition; Ceramics compositions; Processing powders of inorganic compounds preparatory to the manufacturing of ceramic products based on oxide ceramics based on titanium oxides or titanates based on titanates based on alkaline earth metal titanates based on barium titanates
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- C04B2235/32—Metal oxides, mixed metal oxides, or oxide-forming salts thereof, e.g. carbonates, nitrates, (oxy)hydroxides, chlorides
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- C04B2235/3231—Refractory metal oxides, their mixed metal oxides, or oxide-forming salts thereof
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Abstract
The invention relates to a potassium niobate modified BT-KBT-based energy storage ceramic material and a preparation method thereof, belonging to the technical field of electronic ceramics. The potassium niobate modified BT-KBT base has high energy storage densityThe formula of the ceramic material is (1-x) (0.92 BaTiO)3‑0.08(K1/2Bi1/2)TiO3)‑xKNbO3And (x is 0.04-0.10), respectively synthesizing BT, KBT and KN ceramic powder by taking barium carbonate, potassium carbonate, bismuth oxide, titanium dioxide and niobium pentoxide as raw materials, and preparing the BT-KBT-based energy storage ceramic material by the processes of material preparation, ball milling, drying, tabletting, molding, sintering and the like according to a chemical formula. The solid-phase method for preparing the ceramic material has the advantages of low cost, high yield, simple preparation process and the like, and provides a foundation for preparing the novel high-energy-storage-density ceramic material in a large scale and at low cost.
Description
Technical Field
The invention belongs to the technical field of material preparation, and particularly relates to potassium niobate modified BT-KBT-based energy storage ceramic and a preparation method thereof.
Background
As an important energy storage device, a capacitor is one of electronic components widely used in electronic devices. The ceramic capacitor has the advantages of wide temperature range, long service life, reliable performance and the like, and is widely used. The stored energy of the capacitor is easy to maintain, and a superconductor is not needed. The capacitor energy storage is also important to provide instant high power, and is very suitable for application occasions such as lasers, flash lamps and the like. The amount of energy stored by the capacitor is determined by its size and the storage density of the dielectric material. In order to reduce the size and improve the energy storage capacity, the ceramic dielectric material with high energy storage density is developed to effectively solve the problem. The ceramic capacitor has the advantages of wide use temperature range, long service life, reliable performance and the like, and is widely used. The ferroelectric ceramic material has the advantages of large dielectric constant, strong nonlinear effect and the like, and the energy storage density J of the ferroelectric ceramic material in unit volume can be calculated by the following formula:
J＝∫EdP
where P is the polarization and E is its breakdown strength.
The energy storage density of ferroelectric ceramic materials is determined by their minimum polarization strength (P)r) Maximum polarization intensity (P)m) And breakdown strength (E)b) And (4) jointly determining. However, Ba is widely studied0.4Sr0.6TiO3The energy storage density of the ceramic is only 0.37J/cm3The energy storage density is lower.
Disclosure of Invention
The invention aims to provide a potassium niobate modified BT-KBT-based energy storage ceramic and a preparation method thereofThe energy storage density of the ceramic material prepared by the method is up to 0.97J/cm3And the preparation method is simple and easy to realize.
The invention is realized by the following technical scheme:
the invention discloses a potassium niobate modified BT-KBT-based energy storage ceramic, which comprises the following chemical components: (1-x) (0.92 BaTiO)3-0.08(K1/2Bi1/2)TiO3)-xKNbO3(ii) a Wherein, the value range of x is 0.04-0.10.
Preferably, the energy storage density of the BT-KBT-based energy storage ceramic is 0.89-0.97J/cm3。
The invention also discloses a preparation method of the potassium niobate modified BT-KBT-based energy storage ceramic, which comprises the steps of mixing BT ceramic powder, KBT ceramic powder and potassium niobate powder according to a chemical formula (1-x) (0.92 BaTiO)3-0.08(K1/2Bi1/2)TiO3)-xKNbO3Preparing materials, uniformly mixing, forming, keeping the temperature at 1130-1170 ℃ for 2-6 h, and sintering to obtain a BT-KBT-based high energy storage density ceramic material; wherein, the value range of x is 0.04-0.10.
Preferably, the mixing is realized by ball milling, and deionized water is used as a ball milling medium.
Further preferably, the ball milling time is 6-8 h.
Preferably, the mixture is dried at 75-90 ℃ after being uniformly mixed.
Preferably, the BT ceramic powder is prepared by the following method:
according to the chemical formula BaTiO3The barium carbonate and the titanium dioxide are uniformly mixed and then are kept warm for 3 hours at 1150 ℃, and the BT ceramic powder is prepared.
Preferably, the KBT ceramic powder is prepared by the following method:
according to the chemical formula K0.5Bi0.5TiO3The KBT ceramic powder is prepared by uniformly mixing potassium carbonate, bismuth oxide and titanium dioxide, and then keeping the temperature at 950 ℃ for 4 hours.
Preferably, the potassium niobate ceramic powder is prepared by the following method:
according to the formula KNbO3The potassium niobate ceramic powder is prepared by uniformly mixing potassium carbonate and niobium pentoxide and then preserving the heat for 2 hours at 800 ℃.
Compared with the prior art, the invention has the following beneficial technical effects:
the invention reduces the saturation polarization strength by adding potassium niobate, thereby preparing the ceramic material with high energy storage density, because of 0.92BaTiO3-0.08(K1/2Bi1/2)TiO3Has higher maximum polarization intensity (P)m～42.52μC/cm3) But its remanent polarization is high (P)r～36.71μC/cm3) So that the energy storage density is lower (0.46J/cm)3) Due to K in potassium niobate+,Nb5+The crystal lattice distortion is caused when the crystal lattice is entered, the ceramic phase structure is changed from a tetragonal phase to a pseudo-cubic phase, the ferroelectricity is weakened, and the residual polarization intensity of the ceramic phase structure can be effectively reduced, so that the invention is directed to 0.92BaTiO3-0.08(K1/2Bi1/2)TiO3Adding a proper amount of KNbO3To reduce its remanent polarization and thereby obtain a ceramic material with a high energy storage density.
The invention takes barium carbonate, potassium carbonate, bismuth oxide, titanium dioxide and niobium pentoxide as raw materials to prepare (1-x) (0.92 BaTiO) by a solid phase method3-0.08(K1/2Bi1/2)TiO3)-xKNbO3The energy storage density of the ceramic material is up to 0.89-0.97J/cm3. The preparation method has the advantages of simple equipment, simple operation and low cost, can realize large-scale production, and provides a foundation for preparing the high-energy-density ceramic material in a large scale and at low cost.
Drawings
Fig. 1 is a graph of the hysteresis loop of a ceramic material with x being 0.04.
Fig. 2 is a graph of the hysteresis loop of the ceramic material with x being 0.08.
Fig. 3 is a graph of the hysteresis loop of the ceramic material with x being 0.10.
Detailed Description
The present invention will now be described in further detail with reference to specific examples, which are intended to be illustrative, but not limiting, of the invention.
Example 1
A preparation method of a potassium niobate modified BT-KBT based energy storage ceramic material comprises the following steps:
1) according to the chemical formula BaTiO3(BT), uniformly mixing barium carbonate and titanium dioxide, and then keeping the temperature for 3 hours at 1150 ℃ to prepare BT ceramic powder. (ii) a
2) According to the chemical formula K0.5Bi0.5TiO3(KBT), mixing the potassium carbonate, the bismuth oxide and the titanium dioxide evenly, and then preserving the heat for 4 hours at 950 ℃ to prepare KBT ceramic powder.
3) According to the formula KNbO3(KN), mixing the potassium carbonate and the niobium pentoxide uniformly, and then keeping the temperature at 800 ℃ for 2h to prepare the potassium niobate ceramic powder.
4) Mixing BT ceramic powder, KBT ceramic powder and potassium niobate powder according to chemical formula 0.96(0.92 BaTiO)3-0.08(K1/2Bi1/2)TiO3)-0.04KNbO3Proportioning, ball-milling for 6h by using deionized water as a ball-milling medium, uniformly mixing, drying at 80 ℃, tabletting, forming, and sintering at 1170 ℃ for 2h to obtain the ceramic material with high energy storage density.
Example 2
A preparation method of a potassium niobate modified BT-KBT based energy storage ceramic material comprises the following steps:
1) according to the chemical formula BaTiO3(BT), uniformly mixing barium carbonate and titanium dioxide, and then keeping the temperature for 3 hours at 1150 ℃ to prepare BT ceramic powder. (ii) a
2) According to the chemical formula K0.5Bi0.5TiO3(KBT), mixing the potassium carbonate, the bismuth oxide and the titanium dioxide evenly, and then preserving the heat for 4 hours at 950 ℃ to prepare KBT ceramic powder.
3) According to the formula KNbO3(KN), mixing the potassium carbonate and the niobium pentoxide uniformly, and then keeping the temperature at 800 ℃ for 2h to prepare the potassium niobate ceramic powder.
4) Mixing BT ceramic powder, KBT ceramic powder and potassium niobate powder according to chemical formula 0.96 (0).92BaTiO3-0.08(K1/2Bi1/2)TiO3)-0.04KNbO3Proportioning, ball-milling for 6h by using deionized water as a ball-milling medium, uniformly mixing, drying at 80 ℃, tabletting, forming, and sintering at 1170 ℃ for 4h to obtain the ceramic material with high energy storage density.
Example 3
A preparation method of a potassium niobate modified BT-KBT based energy storage ceramic material comprises the following steps:
1) according to the chemical formula BaTiO3(BT), uniformly mixing barium carbonate and titanium dioxide, and then keeping the temperature for 3 hours at 1150 ℃ to prepare BT ceramic powder. (ii) a
2) According to the chemical formula K0.5Bi0.5TiO3(KBT), mixing the potassium carbonate, the bismuth oxide and the titanium dioxide evenly, and then preserving the heat for 4 hours at 950 ℃ to prepare KBT ceramic powder.
3) According to the formula KNbO3(KN), mixing the potassium carbonate and the niobium pentoxide uniformly, and then keeping the temperature at 800 ℃ for 2h to prepare the potassium niobate ceramic powder.
4) Mixing BT ceramic powder, KBT ceramic powder and potassium niobate powder according to chemical formula 0.96(0.92 BaTiO)3-0.08(K1/2Bi1/2)TiO3)-0.04KNbO3Proportioning, ball-milling for 6h by using deionized water as a ball-milling medium, uniformly mixing, drying at 80 ℃, tabletting, forming, and sintering at 1170 ℃ for 6h to obtain the ceramic material with high energy storage density.
Example 4
A preparation method of a potassium niobate modified BT-KBT based energy storage ceramic material comprises the following steps:
1) according to the chemical formula BaTiO3(BT), uniformly mixing barium carbonate and titanium dioxide, and then keeping the temperature for 3 hours at 1150 ℃ to prepare BT ceramic powder. (ii) a
2) According to the chemical formula K0.5Bi0.5TiO3(KBT), mixing the potassium carbonate, the bismuth oxide and the titanium dioxide evenly, and then preserving the heat for 4 hours at 950 ℃ to prepare KBT ceramic powder.
3) According to the formula KNbO3(KN) reacting potassium carbonate and pentaoxideAnd uniformly mixing niobium and niobium, and then keeping the temperature at 800 ℃ for 2 hours to prepare the potassium niobate ceramic powder.
4) BT ceramic powder, KBT ceramic powder and potassium niobate powder are mixed according to a chemical formula of 0.92(0.92 BaTiO)3-0.08(K1/2Bi1/2)TiO3)-0.08KNbO3Proportioning, ball-milling for 6h by using deionized water as a ball-milling medium, uniformly mixing, drying at 80 ℃, tabletting, forming, and sintering at 1170 ℃ for 2h to obtain the ceramic material with high energy storage density.
Example 5
A preparation method of a potassium niobate modified BT-KBT based energy storage ceramic material comprises the following steps:
1) according to the chemical formula BaTiO3(BT), uniformly mixing barium carbonate and titanium dioxide, and then keeping the temperature for 3 hours at 1150 ℃ to prepare BT ceramic powder. (ii) a
2) According to the chemical formula K0.5Bi0.5TiO3(KBT), mixing the potassium carbonate, the bismuth oxide and the titanium dioxide evenly, and then preserving the heat for 4 hours at 950 ℃ to prepare KBT ceramic powder.
3) According to the formula KNbO3(KN), mixing the potassium carbonate and the niobium pentoxide uniformly, and then keeping the temperature at 800 ℃ for 2h to prepare the potassium niobate ceramic powder.
4) BT ceramic powder, KBT ceramic powder and potassium niobate powder are mixed according to a chemical formula of 0.92(0.92 BaTiO)3-0.08(K1/2Bi1/2)TiO3)-0.08KNbO3Proportioning, ball-milling for 6h by using deionized water as a ball-milling medium, uniformly mixing, drying at 80 ℃, tabletting, forming, and sintering at 1170 ℃ for 4h to obtain the ceramic material with high energy storage density.
Example 6
A preparation method of a potassium niobate modified BT-KBT based energy storage ceramic material comprises the following steps:
1) according to the chemical formula BaTiO3(BT), uniformly mixing barium carbonate and titanium dioxide, and then keeping the temperature for 3 hours at 1150 ℃ to prepare BT ceramic powder. (ii) a
2) According to the chemical formula K0.5Bi0.5TiO3(KBT) reaction of potassium carbonate,And uniformly mixing bismuth oxide and titanium dioxide, and then keeping the temperature for 4 hours at 950 ℃ to prepare the KBT ceramic powder.
3) According to the formula KNbO3(KN), mixing the potassium carbonate and the niobium pentoxide uniformly, and then keeping the temperature at 800 ℃ for 2h to prepare the potassium niobate ceramic powder.
4) BT ceramic powder, KBT ceramic powder and potassium niobate powder are mixed according to a chemical formula of 0.92(0.92 BaTiO)3-0.08(K1/2Bi1/2)TiO3)-0.08KNbO3Proportioning, ball-milling for 6h by using deionized water as a ball-milling medium, uniformly mixing, drying at 80 ℃, tabletting, forming, and sintering at 1170 ℃ for 6h to obtain the ceramic material with high energy storage density.
Example 7
A preparation method of a potassium niobate modified BT-KBT based energy storage ceramic material comprises the following steps:
1) according to the chemical formula BaTiO3(BT), uniformly mixing barium carbonate and titanium dioxide, and then keeping the temperature for 3 hours at 1150 ℃ to prepare BT ceramic powder. (ii) a
2) According to the chemical formula K0.5Bi0.5TiO3(KBT), mixing the potassium carbonate, the bismuth oxide and the titanium dioxide evenly, and then preserving the heat for 4 hours at 950 ℃ to prepare KBT ceramic powder.
3) According to the formula KNbO3(KN), mixing the potassium carbonate and the niobium pentoxide uniformly, and then keeping the temperature at 800 ℃ for 2h to prepare the potassium niobate ceramic powder.
4) Mixing BT ceramic powder, KBT ceramic powder and potassium niobate powder according to chemical formula 0.90(0.92 BaTiO)3-0.08(K1/2Bi1/2)TiO3)-0.10KNbO3Proportioning, ball-milling for 6h by using deionized water as a ball-milling medium, uniformly mixing, drying at 80 ℃, tabletting, forming, and sintering at 1170 ℃ for 2h to obtain the ceramic material with high energy storage density.
Example 8
A preparation method of a potassium niobate modified BT-KBT based energy storage ceramic material comprises the following steps:
1) according to the chemical formula BaTiO3(BT) mixing barium carbonate and titanium dioxideUniformly mixing, and keeping the temperature for 3h at 1150 ℃ to obtain the BT ceramic powder. (ii) a
2) According to the chemical formula K0.5Bi0.5TiO3(KBT), mixing the potassium carbonate, the bismuth oxide and the titanium dioxide evenly, and then preserving the heat for 4 hours at 950 ℃ to prepare KBT ceramic powder.
3) According to the formula KNbO3(KN), mixing the potassium carbonate and the niobium pentoxide uniformly, and then keeping the temperature at 800 ℃ for 2h to prepare the potassium niobate ceramic powder.
4) Mixing BT ceramic powder, KBT ceramic powder and potassium niobate powder according to chemical formula 0.90(0.92 BaTiO)3-0.08(K1/2Bi1/2)TiO3)-0.10KNbO3Proportioning, ball-milling for 6h by using deionized water as a ball-milling medium, uniformly mixing, drying at 80 ℃, tabletting, forming, and sintering at 1170 ℃ for 4h to obtain the ceramic material with high energy storage density.
Example 9
A preparation method of a potassium niobate modified BT-KBT based energy storage ceramic material comprises the following steps:
1) according to the chemical formula BaTiO3(BT), uniformly mixing barium carbonate and titanium dioxide, and then keeping the temperature for 3 hours at 1150 ℃ to prepare BT ceramic powder. (ii) a
2) According to the chemical formula K0.5Bi0.5TiO3(KBT), mixing the potassium carbonate, the bismuth oxide and the titanium dioxide evenly, and then preserving the heat for 4 hours at 950 ℃ to prepare KBT ceramic powder.
3) According to the formula KNbO3(KN), mixing the potassium carbonate and the niobium pentoxide uniformly, and then keeping the temperature at 800 ℃ for 2h to prepare the potassium niobate ceramic powder.
4) Mixing BT ceramic powder, KBT ceramic powder and potassium niobate powder according to chemical formula 0.90(0.92 BaTiO)3-0.08(K1/2Bi1/2)TiO3)-0.10KNbO3Proportioning, ball-milling for 6h by using deionized water as a ball-milling medium, uniformly mixing, drying at 80 ℃, tabletting, forming, and sintering at 1170 ℃ for 6h to obtain the ceramic material with high energy storage density.
Referring to FIG. 1, the hysteresis of the ceramic sample prepared in example 1 is shownThe energy storage density of the sample can reach 0.93J/cm3And the energy storage efficiency can reach 44.38%. FIG. 2 is a graph showing the hysteresis loop of the ceramic sample prepared in example 4, from which it can be seen that the energy storage density of the sample can be up to 0.89J/cm3And the energy storage efficiency can reach 55.62%. FIG. 3 is a graph showing the hysteresis loop of the ceramic sample prepared in example 7, from which it can be seen that the energy storage density of the sample can be up to 0.97J/cm3And the energy storage efficiency can reach 55.1%.
Claims (5)
1. The potassium niobate modified BT-KBT based energy storage ceramic is characterized by comprising the following chemical components in percentage by weight: (1-x) (0.92 BaTiO)3-0.08(K1/2Bi1/2)TiO3)-xKNbO3(ii) a Wherein the value range of x is 0.04-0.10;
the energy storage density of the BT-KBT-based energy storage ceramic is 0.89-0.97J/cm3；
The potassium niobate modified BT-KBT based energy storage ceramic is prepared by mixing BT ceramic powder, KBT ceramic powder and potassium niobate powder according to the proportion of the chemical formula, uniformly mixing, forming, keeping the temperature at 1130-1170 ℃ for 2-6 h, and sintering into ceramic.
2. A preparation method of potassium niobate modified BT-KBT based energy storage ceramic is characterized in that BT ceramic powder, KBT ceramic powder and potassium niobate powder are mixed according to a chemical formula (1-x) (0.92 BaTiO)3-0.08(K1/2Bi1/2)TiO3)-xKNbO3Preparing materials, uniformly mixing, forming, keeping the temperature at 1130-1170 ℃ for 2-6 h, and sintering to obtain a BT-KBT-based high energy storage density ceramic material; wherein the value range of x is 0.04-0.10;
the BT ceramic powder is prepared by the following steps: according to the chemical formula BaTiO3The barium carbonate and the titanium dioxide are uniformly mixed and then are subjected to heat preservation for 3 hours at 1150 ℃, so that BT ceramic powder is prepared;
the KBT ceramic powder is prepared by the following method: according to the chemical formula K0.5Bi0.5TiO3The KBT ceramic powder is prepared by uniformly mixing potassium carbonate, bismuth oxide and titanium dioxide, and then preserving heat for 4 hours at 950 ℃;
the potassium niobate ceramic powder is prepared by the following method:
according to the formula KNbO3The potassium niobate ceramic powder is prepared by uniformly mixing potassium carbonate and niobium pentoxide and then preserving the heat for 2 hours at 800 ℃.
3. The method for preparing the potassium niobate modified BT-KBT based energy storage ceramic according to claim 2, wherein the mixing is performed by ball milling and deionized water is used as a ball milling medium.
4. The preparation method of the potassium niobate modified BT-KBT based energy storage ceramic, according to claim 3, wherein the ball milling time is 6-8 h.
5. The method for preparing the potassium niobate modified BT-KBT based energy storage ceramic according to claim 3, wherein the mixture is dried at 75-90 ℃.
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