An optimized noble metal palladium-silver inner electrode slurry for high frequency use in MLCC and a preparation method thereof

Abstract

The present application relates to the field of electronic component materials, and more specifically, it relates to an optimized noble metal palladium silver inner electrode slurry for high frequency use in MLCC and a preparation method thereof. An optimized noble metal palladium silver inner electrode slurry for high frequency use in MLCC, comprising: palladium silver alloy powder, organic carrier, inorganic additive, dispersant; the organic carrier may be ethyl cellulose, hydrogenated rosin, diethylene glycol butyl ether acetate; the inorganic additive includes at least one of zirconium oxide, aluminum oxide, and barium titanate; the dispersant includes at least one of ammonium stearate, ammonium oleate, and ammonium linoleate and at least one of polyethylene glycol octyl ether ester acid amine, polyoxyethylene polyoxypropylene amine ether, polyethylene glycol octyl ester acid amine salt, polyoxyethylene lauryl alcohol ether citrate, and polyoxyethylene polyether fatty acid amine. The present application can effectively alleviate the problem of particle agglomeration in the slurry, optimize the fluidity of the slurry, improve the overall uniformity of the slurry, and enhance the performance of the MLCC.

Description

Technical Field

[0001] The present application relates to the field of electronic component materials, and more specifically, to an optimized noble metal palladium-silver internal electrode slurry for high frequency use in MLCC and a preparation method thereof. Background Art

[0002] In the rapid development of the electronics industry, multilayer ceramic capacitors (MLCCs), as important passive components in integrated circuits, play a vital role in the overall performance of electronic devices. As electronic products continue to evolve towards high frequency, miniaturization, and integration, the design and manufacture of MLCCs face unprecedented challenges. In high-frequency working environments, MLCCs not only need to have excellent electrical properties, such as low impedance, high capacitance density, and good temperature stability, but must also be able to maintain high reliability and long life under extreme conditions.

[0003] At present, the mainstream MLCC internal electrode paste on the market mostly adopts the silver-palladium alloy system, which combines the high conductivity of silver and the excellent corrosion resistance of palladium, and to a certain extent meets the needs of conventional applications. However, in the application scenarios of high-frequency and high-speed signal transmission, the traditional silver-palladium alloy internal electrode paste has gradually exposed its limitations.

[0004] Specifically, the key problem is that the metal and inorganic powder particles in the slurry tend to aggregate and form agglomerates that are difficult to disperse. This uneven particle distribution will lead to an obvious "coffee ring effect" during the printing process, that is, the ink is thicker in the edge area and thinner in the center area, which greatly reduces the flatness of the printed electrode surface.

[0005] This uneven deposition will cause a series of problems during the subsequent sintering process. On the one hand, the discontinuity of the electrode will significantly reduce the current conduction efficiency and increase the delay and loss of signal transmission; on the other hand, the uneven distribution of charge on the electrode surface will aggravate the charging and discharging fluctuations of the capacitor, affecting its charging and discharging performance and cycle stability, thereby shortening the service life of the MLCC. In addition, agglomerates may also cause microcracks or pores in the sintered electrode, further reducing its mechanical strength and temperature resistance. Summary of the invention

[0006] In order to solve the above problems, alleviate the problem of particle agglomeration, optimize the fluidity of the slurry, and improve the overall uniformity of the slurry, the present application provides an optimized precious metal palladium-silver internal electrode slurry for high frequency use in MLCC and a preparation method thereof.

[0007] In the first aspect, the present application provides an optimized noble metal palladium-silver inner electrode paste for high frequency use in MLCC, which adopts the following technical solution:

[0008] An optimized noble metal palladium-silver internal electrode slurry for high frequency MLCC includes the following components by weight percentage: 45%-65% palladium-silver alloy powder, 30%-50% organic carrier, 1.0%-8.0% inorganic additive, 0.5%-1.5% dispersant; the organic carrier includes ethyl cellulose, hydrogenated rosin, and diethylene glycol butyl ether acetate; by weight percentage of the organic carrier, ethyl cellulose is 5%-10%, and hydrogenated rosin is 0.1%-1%;

[0009] The inorganic additive includes at least one of zirconium oxide, aluminum oxide and barium titanate;

[0010] The dispersant includes dispersant A and dispersant B, wherein dispersant A includes at least one of ammonium stearate, ammonium oleate and ammonium linoleate, and dispersant B includes at least one of polyethylene glycol octyl ether ester acid amine, polyoxyethylene polyoxypropylene amine ether, polyethylene glycol octyl ester acid amine salt, polyoxyethylene lauryl ether citrate and polyoxyethylene polyether fatty acid amine.

[0011] By adopting the above technical scheme, a specific organic carrier (such as ethyl cellulose, hydrogenated rosin, diethylene glycol butyl ether acetate) is selected as the basic skeleton of the slurry, and is compounded with a specific dispersant and an inorganic additive to form a basic system. A small amount of specially selected inorganic additives (one of zirconium oxide, aluminum oxide, and barium titanate) in the formula, with its small and uniform particle size, and excellent physical and chemical properties, effectively prevents the agglomeration of palladium-silver alloy powder in the slurry. At the same time, they can cooperate with the dispersant as a dispersion stabilizer to jointly construct a stable dispersion system of the slurry with the organic carrier, ensuring the flatness of the electrode surface during printing. This specific dispersion system provides a good foundation for the dispersion of palladium-silver alloy powder, and provides good rheology and coating properties. This key component ensures that the slurry can maintain a stable state during preparation, storage and use.

[0012] The preferred dispersants A and B are salts formed by combining polymeric organic matter with ammonium ions, which have good surface activity and emulsification. As dispersants, they can help stabilize solid particles in the liquid matrix and prevent particle aggregation. The synergistic effect of dispersants A and B also promotes the uniformity and placement stability of the slurry. This synergistic mechanism is one of the key factors to ensure the optimization of slurry performance.

[0013] It is worth emphasizing that the synergy between the organic carrier, inorganic additives and dispersant is the key to the success of this application. The absence or replacement of any one of them will lead to a significant decrease in the performance of the slurry. The organic carrier provides the basic structure of the slurry, the inorganic additive ensures the stable dispersion of the powder, and the dispersant strengthens this dispersion effect through its surface activity. The three are interdependent and mutually reinforcing, and together constitute the unique advantages of the optimized internal electrode slurry of this application.

[0014] Preferably, the optimized noble metal palladium-silver internal electrode paste for MLCC high frequency includes the following components in weight percentage: 50%-60% palladium-silver alloy powder, 35%-45% organic carrier, 2.0%-5.0% inorganic additive, and 0.5%-1.5% dispersant.

[0015] By adopting the above technical solution, the dosage relationship of each raw material in the system is further limited, so that the slurry can be more fully dispersed and maintain a stable state.

[0016] Preferably, the weight ratio of dispersant A to dispersant B is (0.8-1.2):(0.8-1.2).

[0017] Preferably, the dispersant A is ammonium stearate, and the dispersant B is polyoxyethylene polyoxypropylene amine ether.

[0018] By adopting the above technical solution, the types and dosage of dispersant A and dispersant B are further limited, so that the synergistic relationship can be more fully exerted, and the stabilization of solid particles in the liquid matrix can be enhanced to prevent particle aggregation.

[0019] Preferably, the particle size of the palladium-silver alloy powder is 0.2 μm-0.8 μm.

[0020] Preferably, in the palladium-silver alloy powder, palladium accounts for 2% to 70%, and correspondingly silver accounts for 98% to 30%.

[0021] Preferably, the inorganic additive is nano zirconium oxide of 5nm-15nm.

[0022] By adopting the above technical solution, the preferred nano zirconium oxide particles are small, stably dispersed in the system, and the zirconium oxide material has a high melting point and small shrinkage. It is used in the slurry to coat the metal conductive particles, which can effectively control the shrinkage of the metal conductive phase and help achieve shrinkage matching with the substrate.

[0023] Preferably, the optimized noble metal palladium-silver inner electrode slurry for high frequency use in MLCC also includes an anti-settling agent and a leveling agent.

[0024] Preferably, the anti-settling agent accounts for 0.2%-0.8% by weight of the electrode slurry.

[0025] Preferably, the anti-settling agent includes at least one or more of polyamide wax, polyethylene wax and organic bentonite.

[0026] Preferably, the leveling agent accounts for 0.1%-0.5% by weight of the electrode slurry.

[0027] Preferably, the leveling agent includes at least one of acrylic polymer, silicone oil and silicone resin.

[0028] Preferably, the leveling agent is an acrylic polymer.

[0029] By adopting the above technical solution and adding a small amount of acrylic polymer, the surface tension of the slurry on the substrate is reduced, the wettability is improved, and it has the characteristics of strong defoaming ability, which can not only improve the leveling property of the slurry, but also improve the density of the slurry printing and improve the performance of the final product.

[0030] Preferably, the organic carrier is prepared by dissolving ethyl cellulose, hydrogenated rosin, and diethylene glycol butyl ether acetate.

[0031] In the second aspect, the present application provides a method for preparing an optimized noble metal palladium-silver inner electrode slurry for high frequency use in MLCC, using the following technical solution:

[0032] A method for preparing an optimized noble metal palladium-silver inner electrode slurry for high frequency use in MLCC comprises the following steps:

[0033] Step 1: Stir the organic carrier, inorganic additive and dispersant until there is no dry powder visually, and grind to a fineness of less than 7.5 μm;

[0034] Step 2: Add palladium-silver alloy powder and stir, grind and disperse to a fineness of less than 5.0 μm to obtain an optimized precious metal palladium-silver internal electrode slurry for high frequency MLCC.

[0035] Preferably, a method for preparing an optimized noble metal palladium-silver inner electrode slurry for high frequency use in MLCC comprises the following steps:

[0036] Step 1: Use a manual or power mixer to stir the organic carrier, inorganic additives, and dispersant until there is no dry powder visually observed, and grind them with a three-roll mill to a fineness of less than 7.5 μm;

[0037] Step 2: Add palladium-silver alloy powder and stir, grind and disperse it with a three-roll mill until the fineness is less than 5.0 μm, and obtain the optimized precious metal palladium-silver internal electrode slurry for MLCC high frequency.

[0038] In the industry, inorganic additives in raw materials are generally treated by adding zirconium balls, ball milling, dispersion treatment, and then filtering. Metal powders in raw materials are emulsified using high-speed mixers or high-speed shear emulsifiers with a stirring speed of more than 2800r / min. In the overall preparation process, although the raw materials in the formula are fully pre-dispersed, without considering the time issue, the number of jigs used and the number of processes will increase, and the risk of contamination will also increase accordingly.

[0039] By adopting the above technical solution and pre-rolling treatment of inorganic additives, different from the traditional process using zirconium ball planetary mill, the slurry design and proportioning is more precise and the process operation is more convenient. It also reduces the risk of damaging the large three-roll mill equipment due to careless introduction of inorganic additives in the traditional process.

[0040] Preferably, when the optimized noble metal palladium-silver inner electrode slurry for high frequency MLCC further includes an anti-settling agent and a leveling agent, they are added in step 1 and stirred and mixed together with the organic carrier, the inorganic additive and the dispersant.

[0041] In summary, this application has the following beneficial effects:

[0042] 1. Using palladium-silver alloy powder with concentrated particle size to make palladium-silver slurry can improve the overall uniformity of the slurry and help improve the stability of product performance.

[0043] 2. The pre-rolling treatment of inorganic additives is different from the traditional process that uses zirconium ball planetary mill processing. The slurry design and proportioning are more precise, and the process operation is more convenient. At the same time, it also reduces the risk of damaging the large equipment of the three-roll mill due to careless introduction of zirconium balls in the traditional process.

[0044] 3. Add a small amount of nano zirconium oxide to the formula. The nano particles are small and dispersed stably. The zirconium oxide material has a high melting point and small shrinkage. It is used in the slurry to coat the metal conductive particles. It can effectively control the shrinkage of the metal conductive phase and help achieve shrinkage matching with the substrate.

[0045] 4. Dispersant A and Dispersant B have good surface activity and emulsifying effects. As dispersants, they can help stabilize solid particles in the liquid matrix, prevent particle aggregation, and improve the placement stability of the slurry.

[0046] 5. Adding a small amount of acrylic polymer can reduce the surface tension of the slurry on the substrate, improve the wettability, and has the characteristics of strong defoaming ability. It can not only improve the leveling of the slurry, but also improve the density of the slurry printing and improve the performance of the final product. BRIEF DESCRIPTION OF THE DRAWINGS

[0047] Figure 1 This is a picture taken using non-destructive testing equipment (X-RAY) and an electron microscope to measure the test samples made from the optimized noble metal palladium-silver internal electrode paste for high frequency use in MLCC of Examples 1-4.

[0048] Figure 2 This is a picture taken using non-destructive testing equipment (X-RAY) and an electron microscope to measure the test samples made from the optimized noble metal palladium-silver internal electrode paste for high frequency MLCC of Examples 5-7.

[0049] Figure 3This is a picture taken using non-destructive testing equipment (X-RAY) and an electron microscope to measure the test samples made from the optimized noble metal palladium-silver internal electrode paste for high frequency MLCC of Examples 1-5. DETAILED DESCRIPTION

[0050] The present application is further described in detail below with reference to the accompanying drawings and embodiments.

[0051] The raw materials used in the following examples and comparative examples are all commercially available products.

[0052] Example

[0053] Example 1

[0054] An optimized noble metal palladium-silver inner electrode slurry for high frequency MLCC includes the following components: palladium-silver alloy powder, an organic carrier, an inorganic additive, a dispersant, an anti-settling agent, and a leveling agent.

[0055] The specific contents of various components are shown in Table 1.

[0056] Palladium silver alloy powder, the particle size specification of palladium silver alloy powder is 0.2μm-0.8μm. Palladium accounts for 50% of the palladium silver alloy powder, and correspondingly silver accounts for 50%.

[0057] The organic carrier is ethyl cellulose, hydrogenated rosin and diethylene glycol butyl ether acetate. The organic carrier is prepared by dissolving ethyl cellulose, hydrogenated rosin and diethylene glycol butyl ether acetate.

[0058] The inorganic additive is nano zirconium oxide with a particle size of 5nm-15nm.

[0059] The dispersant includes dispersant A and dispersant B. Dispersant A is ammonium stearate, and dispersant B is polyoxyethylene polyoxypropylene amine ether (Merck's 406686).

[0060] The anti-settling agent is polyamide wax.

[0061] The leveling agent is an acrylic polymer, specifically M-4200 from Soken Chemical.

[0062] The present application also provides a method for preparing an optimized noble metal palladium-silver inner electrode slurry for high frequency use in MLCC, comprising the following steps:

[0063] Step 1: Use a power mixer to stir the organic carrier, inorganic additives, dispersant, anti-settling agent, and leveling agent until there is no dry powder visually detected, and grind them with a three-roll mill to a fineness of 7.5 μm.

[0064] Step 2: Add palladium-silver alloy powder and stir, grind and disperse it with a three-roll mill to a fineness of 5.0 μm to obtain an optimized precious metal palladium-silver internal electrode slurry for high frequency MLCC.

[0065] Example 2

[0066] An optimized noble metal palladium-silver internal electrode paste for high frequency use in MLCC, which differs from Example 1 in that palladium accounts for 2% of the palladium-silver alloy powder and correspondingly silver accounts for 98%.

[0067] According to the weight percentage of the organic carrier, the ethyl cellulose accounts for 10%, the hydrogenated rosin accounts for 1%, and the diethylene glycol butyl ether acetate accounts for 89%.

[0068] The inorganic additive is nano-alumina with a particle size of 5nm-15nm.

[0069] The dispersant includes dispersant A and dispersant B. Dispersant A is ammonium oleate, and dispersant B is triphenylphenol polyoxyethylene ether phosphatidic acid amine salt (Deyi DYY601).

[0070] The anti-settling agent is polyethylene wax (DISPARON 4200-10).

[0071] The leveling agent is silicone oil (Dow Corning PMX200-500CST).

[0072] The specific contents of various components are different, see Table 1 for details.

[0073] The preparation method of an optimized noble metal palladium-silver inner electrode slurry for high frequency use in MLCC is the same as that in Example 1 and will not be described in detail here.

[0074] Example 3

[0075] An optimized noble metal palladium-silver internal electrode paste for high frequency use in MLCC, which differs from Example 1 in that palladium accounts for 70% of the palladium-silver alloy powder and correspondingly silver accounts for 30%.

[0076] According to the weight percentage of the organic carrier, ethyl cellulose accounts for 5%, hydrogenated rosin accounts for 0.1%, and diethylene glycol butyl ether acetate accounts for 94.9%.

[0077] The inorganic additive is 0.2 μm barium titanate.

[0078] The dispersant includes dispersant A and dispersant B. Dispersant A is ammonium oleate, and dispersant B is triethanolamine salt of fatty alcohol polyoxyethylene ether phosphate (BK154 from BYK Chemical).

[0079] The anti-settling agent is organic bentonite (CLATONE-40 from BYK).

[0080] The leveling agent is silicone resin (Dow Corning XIAMETER RSN-0805).

[0081] The specific contents of various components are different, see Table 1 for details.

[0082] The preparation method of an optimized noble metal palladium-silver inner electrode slurry for high frequency use in MLCC is the same as that in Example 1 and will not be described in detail here.

[0083] Embodiment 4-5

[0084] An optimized noble metal palladium-silver internal electrode paste for high frequency use in MLCC, which differs from Example 1 in that the specific contents of various components are different, as shown in Table 1 for details.

[0085] The preparation method of an optimized noble metal palladium-silver inner electrode slurry for high frequency use in MLCC is the same as that in Example 1 and will not be described in detail here.

[0086] Table 1

[0087]

[0088]

[0089] Example 6

[0090] An optimized noble metal palladium-silver inner electrode slurry for high frequency use in MLCC, which differs from Example 1 in that the amount of ammonium stearate is 0.1 kg and the amount of polyoxyethylene polyoxypropylene amine ether is 0.9 kg.

[0091] Example 7

[0092] An optimized noble metal palladium-silver inner electrode slurry for high frequency use in MLCC is different from Example 1 in that the dispersant is ammonium stearate, that is, the ammonium stearate is 1 kg and the polyoxyethylene polyoxypropylene amine ether is 0.

[0093] Comparative Example

[0094] Comparative Example 1

[0095] An optimized noble metal palladium-silver inner electrode slurry for high frequency use in MLCC, which differs from Example 1 in that the dispersant is sodium dodecylbenzene sulfonate.

[0096] That is, the sodium dodecylbenzene sulfonate is 1kg, the ammonium stearate is 0, and the polyoxyethylene polyoxypropylene amine ether is 0.

[0097] The preparation method of an optimized noble metal palladium-silver inner electrode slurry for high frequency use in MLCC is the same as that in Example 1 and will not be described in detail here.

[0098] Comparative Example 2

[0099] An optimized noble metal palladium-silver internal electrode slurry for high frequency use in MLCC, which differs from Example 1 in that the organic carrier includes ethyl cellulose and diethylene glycol butyl ether acetate, the ethyl cellulose is 3.1 kg, and the diethylene glycol butyl ether acetate is 37.1 kg.

[0100] The preparation method of an optimized noble metal palladium-silver inner electrode slurry for high frequency use in MLCC is the same as that in Example 1 and will not be described in detail here.

[0101] Comparative Example 3

[0102] An optimized noble metal palladium-silver internal electrode slurry for high frequency use in MLCC, which is different from Example 1 in that ethyl cellulose is 0.1 kg, hydrogenated rosin is 3 kg, and diethylene glycol butyl ether acetate is 37.1 kg.

[0103] The preparation method of an optimized noble metal palladium-silver inner electrode slurry for high frequency use in MLCC is the same as that in Example 1 and will not be described in detail here.

[0104] Comparative Example 4

[0105] An optimized noble metal palladium-silver inner electrode paste for high frequency use in MLCC, which differs from Example 1 in that the inorganic additive is kaolin.

[0106] The preparation method of an optimized noble metal palladium-silver inner electrode slurry for high frequency use in MLCC is the same as that in Example 1 and will not be described in detail here.

[0107] Comparative Example 5

[0108] The components of an optimized noble metal palladium-silver internal electrode paste for high frequency use in MLCC are the same as those in Example 1 and will not be described in detail here.

[0109] A method for preparing an optimized noble metal palladium-silver inner electrode slurry for high frequency use in MLCC, which is different from that in Example 1, comprises the following steps:

[0110] Step 1: Stir the organic carrier, inorganic additives, dispersant, anti-settling agent and leveling agent until there is no dry powder visually.

[0111] Step 2: Add palladium-silver alloy powder and stir to mix to obtain optimized precious metal palladium-silver internal electrode slurry for high frequency of MLCC.

[0112] Performance testing

[0113] Preparation of test samples: The obtained MLCC high-frequency optimized noble metal palladium silver inner electrode slurry is used to make capacitor products according to the chip-type multilayer capacitor preparation method commonly used by technicians in the field. That is: after the ceramic dielectric diaphragm green body is obtained by tape casting, the MLCC high-frequency optimized noble metal palladium silver inner electrode slurry is used as the inner electrode, and overprinting, isostatic pressing, cutting, debinding, sintering, chamfering treatment are performed, and then the external electrode slurry is coated on both ends of the chip and sintered again to form the external electrode, and then a layer of nickel and tin is electroplated on the external electrode to finally make the capacitor.

[0114] The sintering conditions are: reducing atmosphere furnace, sintering at a temperature of 1250-1300°C, and keeping warm for 2-6 hours.

[0115] Take one printed film of the slurry obtained in Examples 1-7 and Comparative Examples 1-5, and take 100 capacitor products produced. Perform light transmission inspection on the printed film under a microscope, and perform internal defect inspection on the capacitor products using non-destructive testing equipment (X-RAY) and an electron microscope. The inspection results are summarized in Table 2, and the photographic images are referenced to Figure 1-3 .

[0116] Table 2

[0117]

[0118] The above firing conditions are obtained based on the ratio of cracked capacitor products to the total number of capacitor products (100).

[0119] It can be seen from Table 2 above that the slurry obtained in this application is applied to MLCC production, and has excellent printing performance and electrical properties. Comparative Examples 1-4 are based on Example 1, destroying the special combination of organic carrier, dispersant and inorganic additive; Comparative Example 5 is based on Example 1, omitting the pre-rolling treatment process. These changes make it impossible for Comparative Examples 1-5 to effectively prevent the agglomeration phenomenon in the slurry, and the flatness of the electrode surface is not good during printing, resulting in poor printing effect and firing conditions. It shows that the coordinated cooperation between the organic carrier, inorganic additive and dispersant and the pre-rolling treatment are the key to the success of this application. The absence or replacement of any one of them will lead to a significant decrease in the performance of the slurry.

[0120] The capacitor products of Examples 2, 3, 6, and 7 have good printing effects, but poor firing conditions, mainly because the printed internal electrodes lack matching with the shrinkage of the porcelain body during the firing process. This indicates that if the selection and dosage of each raw material in the system can be further limited, both good printing effects and firing conditions can be achieved at the same time.

[0121] This specific embodiment is merely an explanation of the present application and is not a limitation of the present application. After reading this specification, those skilled in the art may make modifications to the present embodiment without any creative contribution as needed, but such modifications are protected by the patent law as long as they are within the scope of the claims of the present application.

Claims

1. An optimized noble metal palladium-silver inner electrode paste for MLCC high frequency, characterized in that: According to weight percentage, it includes the following components: 45%-65% palladium-silver alloy powder, 30%-50% organic carrier, 1.0%-8.0% inorganic additive, and 0.5%-1.5% dispersant; The organic carrier includes ethyl cellulose, hydrogenated rosin, and diethylene glycol butyl ether acetate; according to the weight percentage of the organic carrier, the ethyl cellulose is 5%-10%, and the hydrogenated rosin is 0.1%-1%; The inorganic additive includes at least one of zirconium oxide, aluminum oxide and barium titanate; The dispersant includes dispersant A and dispersant B, wherein dispersant A includes at least one of ammonium stearate, ammonium oleate and ammonium linoleate, and dispersant B includes at least one of polyethylene glycol octyl ether ester acid amine, polyoxyethylene polyoxypropylene amine ether, polyethylene glycol octyl ester acid amine salt, polyoxyethylene lauryl ether citrate and polyoxyethylene polyether fatty acid amine.

2. The MLCC high frequency optimized noble metal palladium silver inner electrode paste according to claim 1, characterized in that: According to weight percentage, the optimized precious metal palladium-silver internal electrode paste for MLCC high frequency includes the following components: 50%-60% palladium-silver alloy powder, 35%-45% organic carrier, 2.0%-5.0% inorganic additives, and 0.5%-1.5% dispersant.

3. The MLCC high frequency optimized noble metal palladium silver inner electrode paste according to claim 1, characterized in that: The weight ratio of the dispersant A to the dispersant B is (0.8-1.2): (0.8-1.2).

4. The MLCC high frequency optimized noble metal palladium silver inner electrode paste according to claim 1, characterized in that: The dispersant A is ammonium stearate, and the dispersant B is polyoxyethylene polyoxypropylene amine ether.

5. The MLCC high frequency optimized noble metal palladium silver inner electrode paste according to claim 1, characterized in that: The particle size of the palladium-silver alloy powder is 0.2 μm-0.8 μm.

6. The MLCC high frequency optimized noble metal palladium silver inner electrode paste according to claim 1, characterized in that: The inorganic additive is nano zirconium oxide with a size of 5nm-15nm.

7. The MLCC high frequency optimized noble metal palladium silver inner electrode paste according to claim 1, characterized in that: The optimized noble metal palladium-silver inner electrode slurry for high frequency use in MLCC also includes an anti-settling agent and a leveling agent.

8. The MLCC high frequency optimized noble metal palladium silver inner electrode paste according to claim 7, characterized in that: The anti-settling agent includes at least one or more of polyamide wax, polyethylene wax and organic bentonite.

9. The MLCC high frequency optimized noble metal palladium silver inner electrode paste according to claim 7, characterized in that: The leveling agent includes at least one of acrylic polymer, silicone oil and silicone resin.

10. A method for preparing the optimized noble metal palladium-silver inner electrode slurry for high frequency use in MLCC according to any one of claims 1 to 9, characterized in that: The following steps are involved: Step 1: Stir the organic carrier, inorganic additive and dispersant until there is no dry powder visually, and grind to a fineness of less than 7.5 μm; Step 2: Add palladium-silver alloy powder and stir, grind and disperse to a fineness of less than 5.0 μm to obtain an optimized precious metal palladium-silver internal electrode slurry for high frequency MLCC.

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