B-site high-entropy ceramics with high energy storage and charge-discharge performance as dielectric materials and preparation method thereof

Abstract

The present invention belongs to the field of energy storage materials, and particularly relates to a B-site high-entropy ceramic with high energy storage and charge-discharge performance as a dielectric material and a preparation method thereof. The chemical formula of the ceramic material is Ba 1‑3x / 2 Bi x (Ti 0.2 Ce 0.2 Nb 0.2 Sn 0.2 Y 0.2 )O 3 . First, it is weighed and mixed according to the stoichiometric ratio, and then obtained by ball milling, drying, calcining, secondary ball milling, granulation molding, debinding, and sintering in sequence. As a dielectric material, the current density (C D ) of the B-site high-entropy ceramic can reach up to 857.3 A / cm 2 , the power density (P D ) can reach 60 MW / cm 3 , and it has an extremely short discharge time, t 0.9 which is about 118 ns. The preparation process of this material is simple and the cost is low. It meets the lead-free environmental protection requirements and is used as a dielectric of a dielectric capacitor in a pulsed power system.

Description

Technical Field

[0001] The present invention belongs to the field of energy storage materials, and particularly relates to a B-site high-entropy ceramic with high energy storage and charge-discharge performance as a dielectric material and a preparation method thereof. Background Art

[0002] The ceramic energy storage material based on barium titanate has the characteristics of simple preparation, low cost, and no pollution, and is widely used in fields such as electronic devices and pulse power systems. In a pulse power system, the dielectric used as a dielectric capacitor directly determines the output characteristics of the pulse power system. However, the ceramic energy storage material based on barium titanate has defects such as low breakdown field strength, low energy storage density, and slow charge-discharge speed, which are insufficient to meet the requirements of modern scientific and technological development.

[0003] As a new design concept, high-entropy ceramics have a stable thermodynamic state and a single-phase structure that is easy to form, which is beneficial to improving the high-temperature dielectric stability of ceramic capacitors. The lattice distortion caused by multiple ions with different valence states and ionic radii at the same position is beneficial to obtaining more small grains, thereby improving the dielectric breakdown strength; and the synergistic effect of multiple ions helps to improve the comprehensive energy storage performance.

[0004] CN 111039672 B discloses a Sn-doped high-entropy perovskite oxide ceramic material with high power density. First, Na 2 CO 3 , Bi 2 O 3 , BaCO 3 , SrCO 3 , CaCO 3 , TiO 2 and SnO 2 are used as raw materials, and the powder is taken according to the chemical formula (Na 0.2 Bi 0.2 Ba 0.2 Sr 0.2 Ca 0.2 )Ti 1-x Sn x O 3 for proportioning, the powder is wet ball-milled and mixed, and the dried powder is pre-sintered at 900 °C for 2 h, and then subjected to secondary ball-milling, sieving and forming, and finally sintered at 1250 °C for 2 h to obtain a single-phase high-entropy perovskite oxide ceramic material with low discharge density and slow charge-discharge speed. Summary of the Invention

[0005] The present invention provides a B-site high-entropy ceramic with high energy storage and charge-discharge performance as a dielectric material, and its chemical composition general formula is Ba 1-3x / 2 Bi x (Ti0.2 Ce 0.2 Nb 0.2 Sn 0.2 Y 0.2 )O 3 (0.01 ≤ x ≤ 0.07).

[0006] To achieve the above object, the present invention is realized through the following technical solutions:

[0007] (1) Using barium carbonate, bismuth trioxide, titanium dioxide, cerium dioxide, niobium pentoxide, tin dioxide, and yttrium oxide as raw materials, according to the chemical formula Ba 1-3x / 2 Bi x (Ti 0.2 Ce 0.2 Nb 0.2 Sn 0.2 Y 0.2 )O 3 Weigh them and successively carry out ball milling, drying, grinding, and calcination;

[0008] The calcination temperature is 1050 °C and the calcination time is 2 hours.

[0009] (2) Carry out secondary ball milling on the calcined powder, dry it, add a polyvinyl alcohol solution for granulation, and press it into a ceramic wafer;

[0010] The mass concentration of the polyvinyl alcohol solution is 8%, and the pressure for pressing into the ceramic wafer is 9 MPa.

[0011] The ball milling in steps (1) and (2) is carried out in a planetary ball mill. Add anhydrous ethanol and zirconia balls as ball milling media in a nylon pot, and the ball milling time is 12 - 14 hours.

[0012] The drying in steps (1) and (2) is carried out in a forced air drying oven at a temperature of 100 °C.

[0013] (3) Debind the made ceramic wafer and sinter it to obtain the high-entropy ceramic material.

[0014] During the debinding process, the debinding temperature is 550 °C and the debinding time is 3 hours.

[0015] The sintering temperature is 1200 - 1300 °C, the heating rate is 3 °C / min, and the holding time is 3 hours.

[0016] The present invention also includes coating silver on both sides of the prepared ceramic material as electrodes, performing heat treatment at 450 °C for 30 minutes, heating the silver-burned ceramic material in silicone oil for 10 min at a temperature of 50 °C - 60 °C to remove surface bubbles, and then carrying out the characterization of electrical properties.

[0017] Compared with the prior art, the present invention has the following technical effects:

[0018] (1) The energy storage material prepared by the present invention does not contain toxic lead, is environmentally friendly and harmless, has low cost, and has a simple process.

[0019] (2) The material prepared by the present invention has good charge and discharge performance at room temperature, and the current density and power density are up to 857.3 A / cm 2 and 60 MW / cm 3 . In addition, t 0.9 is about 118 ns, having an ultra-fast charge and discharge rate. BRIEF DESCRIPTION OF THE DRAWINGS

[0020] Figure 1 XRD pattern of the high-entropy ceramic Ba 0.985 Bi 0.01 (Ti 0.2 Ce 0.2 Nb 0.2 Sn 0.2 Y 0.2 )O 3 in Example 1.

[0021] Figure 2 SEM image of the high-entropy ceramic Ba 0.985 Bi 0.01 (Ti 0.2 Ce 0.2 Nb 0.2 Sn 0.2 Y 0.2 )O 3 in Example 1.

[0022] Figure 3 Underdamped curve of the high-entropy ceramic Ba 0.925 Bi 0.05 (Ti 0.2 Ce 0.2 Nb 0.2 Sn 0.2 Y 0.2 )O 3 in Example 3.

[0023] Figure 4 Overdamped curve of the high-entropy ceramic Ba 0.925 Bi 0.05 (Ti 0.2 Ce 0.2 Nb 0.2 Sn 0.2 Y 0.2 )O 3 in Example 3.

[0024] Figure 5 For Ba in Example 30.925 Bi 0.05 (Ti 0.2 Ce 0.2 Nb 0.2 Sn 0.2 Y 0.2 )O 3 Discharge density vs. time graph of high-entropy ceramics. Detailed implementation manners

[0025] Example 1

[0026] (1) Using barium carbonate, bismuth trioxide, titanium dioxide, cerium dioxide, niobium pentoxide, tin dioxide, and yttrium oxide as raw materials, according to the chemical formula Ba 0.985 Bi 0.01 (Ti 0.2 Ce 0.2 Nb 0.2 Sn 0.2 Y 0.2 )O 3 Weigh the materials, add anhydrous ethanol and zirconia balls into a nylon jar for ball milling, drying, grinding, and calcination. The ball milling time is 12 hours, then put it into a blast dryer for drying at a temperature of 100 °C. Pour the dried powder into an agate mortar for grinding, then put it into a crucible for compaction, and then put it into a muffle furnace for calcination. The calcination temperature is 1050 °C and the calcination time is 2 hours.

[0027] (2) Perform secondary ball milling and drying on the calcined powder, add a polyvinyl alcohol solution for granulation, and press it into a ceramic wafer. The ball milling and drying steps are the same as in step (1). Add the dried powder to a polyvinyl alcohol solution with a mass fraction of 8% for granulation, and press it into a ceramic wafer under a pressure of 9 MPa.

[0028] (3) Put the made ceramic wafer into a muffle furnace for debinding, the debinding temperature is 550 °C and the debinding time is 3 hours.

[0029] (4) Put the debound ceramic wafer into a crucible, bury it in zirconia powder, and sinter it in a muffle furnace. The sintering temperature is 1250 °C, the heating rate is 3 °C / min, and the holding time is 3 hours to obtain a high-entropy ceramic sample. The XRD pattern of the prepared ceramic is as Figure 1 shown, it can be seen that the prepared ceramic is Ba with a perovskite structure 0.985 Bi 0.01 (Ti 0.2 Ce 0.2 Nb 0.2 Sn 0.2 Y 0.2 )O 3 . The SEM pattern of the prepared perovskite high-entropy ceramic is as Figure 2 shown, and the particle size distribution is uniform and the packing is dense.

[0030] (5) The sintered ceramic sample is silvered and then placed in a muffle furnace for silver firing at a temperature of 450 °C for 30 minutes.

[0031] (6) The silver-fired ceramic material is heated in silicone oil for 10 min at a temperature of 60 °C to remove surface bubbles for the characterization of electrical properties.

[0032] Example 2

[0033] (1) Using barium carbonate, bismuth trioxide, titanium dioxide, cerium dioxide, niobium pentoxide, tin dioxide, and yttrium oxide as raw materials, according to the chemical formula Ba 0.955 Bi 0.03 (Ti 0.2 Ce 0.2 Nb 0.2 Sn 0.2 Y 0.2 )O 3 Weigh the materials, add anhydrous ethanol and zirconia balls to a nylon jar for ball milling, drying, grinding, and calcining. The ball milling time is 12 hours, and it is dried in a blast dryer at a temperature of 100 °C. The dried powder is poured into an agate mortar for grinding, then compacted in a crucible and placed in a muffle furnace for calcining. The calcining temperature is 1050 °C, and the calcining time is 2 hours.

[0034] (2) The calcined powder is subjected to secondary ball milling, drying, granulated by adding a polyvinyl alcohol solution, and pressed into a ceramic disc. The ball milling and drying steps are the same as in step (1). The dried powder is granulated by adding a polyvinyl alcohol solution with a mass fraction of 8% and pressed into a ceramic disc under a pressure of 9 MPa.

[0035] (3) The fabricated ceramic disc is placed in a muffle furnace for debinding at a debinding temperature of 550 °C for 3 hours.

[0036] (4) The debound ceramic disc is placed in a crucible, buried in zirconia powder, and sintered in a muffle furnace at a sintering temperature of 1250 °C, a heating rate of 3 °C / min, and a holding time of 3 hours to obtain a high-entropy ceramic sample.

[0037] (5) The sintered ceramic sample is silvered and then placed in a muffle furnace for silver firing at a temperature of 450 °C for 30 minutes.

[0038] (6) The silver-fired ceramic material is heated in silicone oil for 10 min at a temperature of 60 °C to remove surface bubbles for the characterization of electrical properties.

[0039] Example 3

[0040] (1) Using barium carbonate, bismuth trioxide, titanium dioxide, cerium dioxide, niobium pentoxide, tin dioxide, and yttrium oxide as raw materials, according to the chemical formula Ba0.925 Bi 0.05 (Ti 0.2 Ce 0.2 Nb 0.2 Sn 0.2 Y 0.2 )O 3 Weigh the materials. Add absolute ethanol and zirconia balls into a nylon jar for ball milling, drying, grinding, and calcining. The ball milling time is 12 hours. Place it in a blast dryer for drying at a temperature of 100 °C. Pour the dried powder into an agate mortar for grinding, then place it in a crucible for compaction, and put it into a muffle furnace for calcining. The calcining temperature is 1050 °C and the calcining time is 2 hours.

[0041] (2) Perform secondary ball milling and drying on the calcined powder, add a polyvinyl alcohol solution for granulation, and press it into a ceramic wafer. The ball milling and drying steps are the same as in step (1). Add the dried powder to a polyvinyl alcohol solution with a mass fraction of 8% for granulation, and press it into a ceramic wafer under a pressure of 9 MPa.

[0042] (3) Place the made ceramic wafer into a muffle furnace for debinding. The debinding temperature is 550 °C and the debinding time is 3 hours.

[0043] (4) Place the debound ceramic wafer into a crucible, bury it in zirconia powder, and sinter it in a muffle furnace. The sintering temperature is 1250 °C, the heating rate is 3 °C / min, and the holding time is 3 hours to obtain a high-entropy ceramic sample.

[0044] (5) Silver the sintered ceramic sample, place it in a muffle furnace for silver firing at a temperature of 450 °C for 30 minutes of holding.

[0045] (6) Heat the silver-fired ceramic material in silicone oil for 10 min at a temperature of 60 °C to remove surface bubbles for the characterization of electrical properties.

[0046] Test the pulse underdamped and overdamped discharge current curves of the prepared sample at a voltage of 140 kV / mm. The underdamped curve of the ceramic sample is as Figure 3 shown. It can be seen that this material has a large current density and power density, which is beneficial to the application of pulsed capacitors. Figure 4 、 5 are respectively the overdamped curve diagram of the ceramic prepared in Example 3 and the diagram of the relationship between discharge density and time. It can be seen from the figure that 90% of the energy only needs 118 ns to complete the release, indicating that it has an extremely fast charge-discharge rate.

[0047] Example 4

[0048] (1) Using barium carbonate, bismuth trioxide, titanium dioxide, cerium dioxide, niobium pentoxide, tin dioxide, and yttrium oxide as raw materials, according to the chemical formula Ba 0.895Bi 0.07 (Ti 0.2 Ce 0.2 Nb 0.2 Sn 0.2 Y 0.2 )O 3 Weigh the materials, add absolute ethanol and zirconia balls in a nylon jar for ball milling, drying, grinding, and calcining. The ball milling time is 12 hours. Dry it in a blast dryer at a temperature of 100 °C. Pour the dried powder into an agate mortar for grinding, then put it into a crucible for compaction, and put it into a muffle furnace for calcining. The calcining temperature is 1050 °C and the calcining time is 2 hours.

[0049] (2) Perform secondary ball milling on the calcined powder, dry it, add a polyvinyl alcohol solution for granulation, and press it into a ceramic wafer. The ball milling step and the drying step are the same as in step (1). Add the dried powder to a polyvinyl alcohol solution with a mass fraction of 8% for granulation, and press it into a ceramic wafer under a pressure of 9 MPa.

[0050] (3) Put the made ceramic wafer into a muffle furnace for debinding. The debinding temperature is 550 °C and the debinding time is 3 hours.

[0051] (4) Put the debound ceramic wafer into a crucible, bury it in zirconia powder, and sinter it in a muffle furnace. The sintering temperature is 1250 °C, the heating rate is 3 °C / min, and the holding time is 3 hours to obtain a high-entropy ceramic sample.

[0052] (5) Silver the sintered ceramic sample, put it into a muffle furnace for silver firing at a temperature of 450 °C, and hold for 30 minutes.

[0053] (6) Put the silver-fired ceramic material into silicone oil and heat it at 60 °C for 10 min to remove surface bubbles for electrical property characterization.

[0054] Example 5

[0055] (1) Using barium carbonate, bismuth trioxide, titanium dioxide, cerium dioxide, niobium pentoxide, tin dioxide, and yttrium oxide as raw materials, according to the chemical formula Ba 0.925 Bi 0.05 (Ti 0.2 Ce 0.2 Nb 0.2 Sn 0.2 Y 0.2 )O 3 Weigh the materials, add absolute ethanol and zirconia balls in a nylon jar for ball milling, drying, grinding, and calcining. The ball milling time is 12 hours. Dry it in a blast dryer at a temperature of 100 °C. Pour the dried powder into an agate mortar for grinding, then put it into a crucible for compaction, and put it into a muffle furnace for calcining. The calcining temperature is 1050 °C and the calcining time is 2 hours.

[0056] (2) The calcined powder is subjected to secondary ball milling, dried, granulated by adding a polyvinyl alcohol solution, and pressed into a ceramic wafer. The ball milling step and the drying step are the same as those in step (1). The dried powder is granulated by adding a polyvinyl alcohol solution with a mass fraction of 8%, and pressed into a ceramic wafer under a pressure of 9 MPa.

[0057] (3) The made ceramic wafer is placed in a muffle furnace for debinding. The debinding temperature is 550 °C and the debinding time is 3 hours.

[0058] (4) The debound ceramic wafer is placed in a crucible, buried in zirconia powder, and sintered in a muffle furnace. The sintering temperature is 1200 °C, the heating rate is 3 °C / min, and the holding time is 3 hours to obtain a high-entropy ceramic sample.

[0059] (5) The sintered ceramic sample is silver-plated and placed in a muffle furnace for silver firing at a temperature of 450 °C for 30 minutes.

[0060] (6) The silver-fired ceramic material is placed in silicone oil and heated at 60 °C for 10 min to remove surface bubbles for electrical property characterization.

[0061] Example 6

[0062] (1) Using barium carbonate, bismuth trioxide, titanium dioxide, cerium dioxide, niobium pentoxide, tin dioxide, and yttrium oxide as raw materials, according to the chemical formula Ba 0.925 Bi 0.05 (Ti 0.2 Ce 0.2 Nb 0.2 Sn 0.2 Y 0.2 )O 3 Weigh the materials, add anhydrous ethanol and zirconia balls in a nylon jar for ball milling, drying, grinding, and calcining. The ball milling time is 12 hours, and it is dried in a blast dryer at a temperature of 100 °C. The dried powder is poured into an agate mortar for grinding, then compacted in a crucible and placed in a muffle furnace for calcining. The calcining temperature is 1050 °C and the calcining time is 2 hours.

[0063] (2) The calcined powder is subjected to secondary ball milling, dried, granulated by adding a polyvinyl alcohol solution, and pressed into a ceramic wafer. The ball milling step and the drying step are the same as those in step (1). The dried powder is granulated by adding a polyvinyl alcohol solution with a mass fraction of 8%, and pressed into a ceramic wafer under a pressure of 9 MPa.

[0064] (3) The made ceramic wafer is placed in a muffle furnace for debinding. The debinding temperature is 550 °C and the debinding time is 3 hours.

[0065] (4) Place the debinded ceramic wafers into a crucible, bury them in zirconia powder, and sinter them in a muffle furnace at a sintering temperature of 1300 °C, a heating rate of 3 °C / min, and a holding time of 3 hours to obtain high-entropy ceramic samples.

[0066] (5) Silver the sintered ceramic samples and then sinter them in a muffle furnace at a temperature of 450 °C for 30 minutes.

[0067] (6) Heat the silvered ceramic materials in silicone oil at 60 °C for 10 minutes to remove surface bubbles for electrical property characterization.

[0068] Control Example 1

[0069] (1) Using barium carbonate, bismuth trioxide, titanium dioxide, cerium dioxide, niobium pentoxide, tin dioxide, and aluminum trioxide as raw materials, according to the chemical formula Ba 0.895 Bi 0.07 (Ti 0.2 Ce 0.2 Nb 0.2 Sn 0.2 Al 0.2 )O 3 Weigh the materials, add anhydrous ethanol and zirconia balls to a nylon jar for ball milling, drying, grinding, and calcining. The ball milling time is 12 hours. Dry it in a blast dryer at 100 °C. Pour the dried powder into an agate mortar for grinding, then compact it in a crucible and calcine it in a muffle furnace. The calcination temperature is 1050 °C and the calcination time is 2 hours.

[0070] (2) Perform secondary ball milling and drying on the calcined powder, add a polyvinyl alcohol solution for granulation, and press it into ceramic wafers. The ball milling and drying steps are the same as in step (1). Add a polyvinyl alcohol solution with a mass fraction of 8% to the dried powder for granulation and press it into ceramic wafers under a pressure of 9 MPa.

[0071] (3) Place the formed ceramic wafers into a muffle furnace for debinding at a debinding temperature of 550 °C for 3 hours.

[0072] (4) Place the debinded ceramic wafers into a crucible, bury them in zirconia powder, and sinter them in a muffle furnace at a sintering temperature of 1250 °C, a heating rate of 3 °C / min, and a holding time of 3 hours to obtain high-entropy ceramic samples.

[0073] (5) Silver the sintered ceramic samples and then sinter them in a muffle furnace at a temperature of 450 °C for 30 minutes.

[0074] (6) Heat the silvered ceramic materials in silicone oil at 60 °C for 10 minutes to remove surface bubbles for electrical property characterization.

[0075] Comparative Example 2

[0076] (1) Using barium carbonate, bismuth trioxide, titanium dioxide, cerium dioxide, niobium pentoxide, and tin dioxide as raw materials, in accordance with the chemical formula Ba 0.895 Bi 0.07 (Ti 0.25 Ce 0.25 Nb 0.25 Sn 0.25 )O 3 Weigh the materials, add anhydrous ethanol and zirconia balls to a nylon jar for ball milling, drying, grinding, and calcination. The ball milling time is 12 hours, and it is dried in a blast dryer at a temperature of 100 °C. The dried powder is poured into an agate mortar for grinding, then compacted in a crucible and placed in a muffle furnace for calcination. The calcination temperature is 1050 °C, and the calcination time is 2 hours.

[0077] (2) The calcined powder is subjected to secondary ball milling, drying, granulated by adding a polyvinyl alcohol solution, and pressed into a ceramic wafer. The ball milling and drying steps are the same as in step (1). The dried powder is granulated by adding a polyvinyl alcohol solution with a mass fraction of 8%, and pressed into a ceramic wafer under a pressure of 9 MPa.

[0078] (3) The fabricated ceramic wafer is placed in a muffle furnace for debinding. The debinding temperature is 550 °C, and the debinding time is 3 hours.

[0079] (4) The debound ceramic wafer is placed in a crucible, buried in zirconia powder, and sintered in a muffle furnace. The sintering temperature is 1250 °C, the heating rate is 3 °C / min, and the holding time is 3 hours to obtain a high-entropy ceramic sample.

[0080] (5) The sintered ceramic sample is silver-plated and placed in a muffle furnace for silver firing at a temperature of 450 °C for 30 minutes.

[0081] (6) The silver-fired ceramic material is heated in silicone oil for 10 min at a temperature of 60 °C to remove surface bubbles for electrical property characterization.

[0082] Table 1 shows the comparison of charge-discharge performance between the ceramics prepared in the above examples and other energy storage materials.

[0083]

[0084] Among them, 0.9BaTiO 3 -0.1(Bi 0.9 Na 0.1 )(In 0.8 Zr 0.2 )O 3 is the ceramic material obtained from the reference patent CN108409319B; (Na 0.2Bi 0.2 Ba 0.2 Sr 0.2 Ca 0.2 )Ti 0.97 Sn 0.03 O 3 is the ceramic material obtained from Example 2 of the reference patent CN 111039672 B.

[0085] As can be seen from Table 1, samples with different Bi contents have different charge-discharge performances. Moreover, compared with other materials, the materials disclosed in the present invention have higher energy density and faster charge-discharge speed, which is beneficial to practical applications.

[0086] The described embodiments are some of the embodiments of the present invention, rather than all of them. All other embodiments obtained by those of ordinary skill in the art based on the embodiments of the present invention without creative efforts fall within the scope of protection of the present invention.

Claims

1. Preparation method of B-site high-entropy ceramics with high energy storage and charge-discharge performance, Characterized in that, The steps of the preparation method are as follows: (1) Using barium carbonate, bismuth trioxide, titanium dioxide, cerium dioxide, niobium pentoxide, tin dioxide, and yttrium oxide as raw materials, in accordance with the chemical formula Ba 1-3x / 2 Bi x (Ti 0.2 Ce 0.2 Nb 0.2 Sn 0.2 Y 0.2 )O 3 Weigh and successively carry out ball milling, drying, grinding, and calcination at 1050 °C for 2 hours; where 0.01 ≤ x ≤ 0.07; (2) Perform secondary ball milling on the calcined powder, dry it, add a polyvinyl alcohol solution for granulation, and press it into a ceramic wafer; (3) Debind the made ceramic wafer and sinter it to obtain B-site high-entropy ceramics with high energy storage and charge-discharge performance; The sintering temperature is 1200 - 1300 °C, the heating rate is 3 ° / min, and the holding time is 3 hours.

2. The preparation method of B-site high-entropy ceramics with high energy storage and charge-discharge performance according to claim 1, Characterized in that, The ball milling in step (1) and step (2) is carried out in a planetary ball mill, the ball milling medium is anhydrous ethanol and zirconia balls, and the ball milling time is 12 - 14 hours.

3. The preparation method of B-site high-entropy ceramics with high energy storage and charge-discharge performance according to claim 1, Characterized in that, The drying in step (1) and step (2) is carried out in a forced-air drying oven at a temperature of 100 °C.

4. The preparation method of B-site high-entropy ceramics with high energy storage and charge-discharge performance according to claim 1, Characterized in that, In step (2), the mass concentration of the polyvinyl alcohol solution is 8%.

5. The preparation method of B-site high-entropy ceramics with high energy storage and charge-discharge performance according to claim 1, Characterized in that, In step (2), the molding pressure for pressing is 9 MPa.

6. The preparation method of B-site high-entropy ceramics with high energy storage and charge-discharge performance according to claim 1, Characterized in that, In step (3) during the debinding process, the debinding temperature is 550 °C and the debinding time is 3 hours.

7. A B-site high-entropy ceramic with high energy storage and charge-discharge performance prepared by the method according to any one of claims 1 - 6, Characterized in that, The chemical composition of the ceramic is Ba 1-3x / 2 Bi x (Ti 0.2 Ce 0.2 Nb 0.2 Sn 0.2 Y 0.2 )O 3 , where 0.01 ≤ x ≤ 0.

07.

8. Application of the B-site high-entropy ceramic with high energy storage and charge-discharge performance prepared by the method according to any one of claims 1 - 6, Characterized in that, The B-site high-entropy ceramic is used as a dielectric in a dielectric capacitor.

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