Methods and applications for preparing high-reliability tantalum capacitor anodes using recycled tantalum powder

Abstract

This invention discloses a method and application for preparing high-reliability tantalum capacitor anodes using recycled tantalum powder. The method includes the following steps: S1, the recycled tantalum powder is subjected to deoxygenation reprocessing to obtain recycled tantalum powder with low oxygen content; S2, the recycled tantalum powder with low oxygen content is modified by nano-tantalum nitride doping, so that nano-tantalum nitride particles are uniformly attached to the surface and interstices of the recycled tantalum powder particles; S3, the nano-tantalum nitride-modified recycled tantalum powder is mixed with a binder and formed into a tantalum anode green blank; S4, the tantalum anode green blank is subjected to two-stage gradient vacuum sintering to obtain a sintered tantalum anode; S5, the sintered tantalum anode is subjected to anodizing treatment to form a Ta2O5 dielectric layer.

Description

Technical Field

[0001] This invention belongs to the field of supercapacitor technology, specifically relating to a method and application for preparing high-reliability tantalum capacitor anodes using recycled tantalum powder. Background Technology

[0002] Tantalum is a rare strategic metal with excellent electrical conductivity, corrosion resistance, and dielectric properties, making it a core raw material for the anodes of high-end tantalum capacitors. Currently, to achieve resource recycling and reduce the high cost of virgin tantalum powder, the industry commonly dismantles and purifies waste tantalum capacitors to produce recycled tantalum powder.

[0003] However, after repeated processing such as charge-discharge oxidation, high-temperature sintering, and mechanical dismantling, waste tantalum powder will form an excessively thick and unevenly distributed natural oxide layer on the particle surface. At the same time, the powder has many lattice defects and extremely high oxygen impurity content, generally exceeding 3000 ppm. This leads to two major pain points in the recycled tantalum powder industry: 1. Extremely poor electrical performance: In conventional anodizing processes, recycled tantalum powder with high oxygen content cannot form a dense, highly crystalline Ta2O5 dielectric layer. The dielectric layer has a large number of micropores, microcracks, and lattice defects. The resulting tantalum capacitors have significantly increased leakage current and significantly reduced breakdown voltage, and the product reliability cannot meet the requirements of high-end applications; 2. Poor molding and processing performance: Due to long-term oxidation and grain aging, recycled tantalum powder has high hardness and brittleness, and extremely poor particle flowability. Under conventional pressing processes, problems such as anode block delamination, cracking, and uneven porosity are very likely to occur. After sintering, the pore structure is disordered, which further aggravates the degradation of capacitor performance. As a result, recycled tantalum powder can only be used for low-end, low-precision capacitor products, resulting in extremely low resource utilization.

[0004] Currently, there is no mature process in the industry that can simultaneously solve the composite problems of high oxygen impurities, poor formability, and numerous dielectric layer defects in recycled tantalum powder. Traditional acid washing deoxygenation processes rely on highly corrosive reagents such as hydrofluoric acid, which cause significant pollution, corrode the powder matrix, and have limited deoxygenation effects, thus failing to enable high-end applications of recycled tantalum powder. Summary of the Invention

[0005] In view of this, some embodiments disclose a method for preparing a high-reliability tantalum capacitor anode using recycled tantalum powder, including the steps of:

[0006] S1. Regenerated tantalum powder is subjected to deoxygenation reprocessing to obtain regenerated tantalum powder with low oxygen content;

[0007] S2. Low oxygen content recycled tantalum powder is modified by nano-tantalum nitride doping, so that nano-tantalum nitride particles are uniformly attached to the surface and interstices of the recycled tantalum powder particles.

[0008] S3, nano-tantalum nitride doped and modified recycled tantalum powder is mixed with binder and formed into tantalum anode green blank;

[0009] S4. The tantalum anode green billet is subjected to two-stage gradient vacuum sintering to obtain the sintered tantalum anode;

[0010] S5. Perform anodic energizing treatment on the sintered tantalum anode to form a Ta2O5 dielectric layer.

[0011] Furthermore, some embodiments of the method for preparing high-reliability tantalum capacitor anodes using recycled tantalum powder further include the step of:

[0012] S6. The tantalum anode after the energy-enhancing treatment is immersed in an ethanol-modified solution containing ammonium dihydrogen phosphate. After being fully wetted, it is taken out and subjected to low-temperature heat treatment.

[0013] Some embodiments disclose a method for preparing a high-reliability tantalum capacitor anode using recycled tantalum powder, wherein step S1 specifically includes:

[0014] The recycled tantalum powder was spread evenly inside a high-vacuum tube furnace, and the vacuum level inside the furnace was controlled to be <10. -3 Pa, heat to 800-1000℃ and preheat at a constant temperature;

[0015] High-purity magnesium vapor is continuously introduced to carry out a gas-phase reduction reaction, and the reaction is kept at a temperature for 1 to 3 hours.

[0016] After the reaction is complete, the mixture is cooled to room temperature under vacuum and then screened to obtain powder.

[0017] Some embodiments disclose a method for preparing a high-reliability tantalum capacitor anode using recycled tantalum powder, wherein step S2 specifically includes:

[0018] High-purity regenerated tantalum powder after deoxygenation treatment is added to a high-speed ball mixer and 0.05-0.5 wt% of TaN nanopowder for dry mechanical uniform mixing.

[0019] Some embodiments disclose a method for preparing a high-reliability tantalum capacitor anode using recycled tantalum powder. In step S3, the binder is a camphor / stearic acid composite binder, and the amount added is 0.1 to 0.3 wt% of the mass of the recycled tantalum powder.

[0020] Some embodiments disclose a method for preparing high-reliability tantalum capacitor anodes using recycled tantalum powder. In step S4, the two-stage gradient vacuum sintering includes:

[0021] The first step is to pre-sinter at a low temperature of 1200℃ for 30-60 minutes to remove the internal adhesive.

[0022] The second step is to raise the temperature to 1450-1600℃ for high-vacuum sintering and hold it at that temperature for 1-2 hours.

[0023] Some embodiments disclose a method for preparing a high-reliability tantalum capacitor anode using recycled tantalum powder, wherein step S5 specifically includes:

[0024] The sintered tantalum anode is placed in a phosphoric acid electrolyte for anode energization treatment, with the energization voltage controlled at 120% of the rated voltage of the tantalum capacitor.

[0025] On the other hand, some embodiments disclose high-reliability tantalum capacitor anodes obtained by the method for preparing high-reliability tantalum capacitor anodes using recycled tantalum powder disclosed in the embodiments of the present invention.

[0026] On the other hand, some embodiments disclose the application of high-reliability tantalum capacitor anodes, which are used to manufacture high-reliability tantalum capacitors.

[0027] On the other hand, some embodiments disclose high-reliability tantalum capacitors that include the high-reliability tantalum capacitor anode disclosed in the embodiments of the present invention.

[0028] The method and application for preparing high-reliability tantalum capacitor anodes using recycled tantalum powder disclosed in this invention have at least the following beneficial technical effects:

[0029] 1. Significantly improved electrical performance: After vacuum phase oxygen reduction and dielectric defect repair, the leakage current of the anode prepared by regenerated tantalum powder is reduced by 40-60% compared with the traditional regeneration process, and the electrical performance is close to that of virgin high-purity tantalum powder; the overall anode breakdown voltage is increased by 20%, and the withstand voltage stability is significantly enhanced.

[0030] 2. Improved stability in forming and mass production: By using TaN nano-doping and composite additives, and gradient sintering process, the industry problems of hardness and brittleness, poor fluidity, pressing delamination and cracking, and uneven sintering porosity of recycled tantalum powder are completely solved. The qualified rate of anode blank forming is greatly improved, and industrial mass production can be stably achieved.

[0031] 3. Cost advantage: The cost of recycled tantalum powder raw materials used in this process is only 30-50% of that of virgin high-purity tantalum powder. Under the premise of meeting performance standards, it significantly reduces the production cost of high-end tantalum capacitors and is suitable for large-scale promotion.

[0032] 4. Green, environmentally friendly and pollution-free: It abandons the polluting processes such as hydrofluoric acid strong acid etching and high-temperature incineration required by traditional recycling processes. The entire process adopts gas phase reduction, dry doping and low temperature modification processes, with no strong corrosive waste liquid or waste gas emissions, realizing the green closed-loop recycling of tantalum metal resources.

[0033] 5. High versatility: The entire process does not change the size, structure, or packaging of the tantalum capacitor, and can be directly adapted to existing tantalum capacitor production lines without equipment modification. It is compatible with the anode preparation of various specifications of solid and liquid tantalum capacitors. Attached Figure Description

[0034] Figure 1 , oneSome embodiments disclose a flowchart of a method for preparing a high-reliability tantalum capacitor anode using recycled tantalum powder. Detailed Implementation

[0035] The term "embodiment" used herein, as an example, is not necessarily to be construed as superior to or better than other embodiments. Performance testing in these embodiments of the invention, unless otherwise specified, employs conventional testing methods in the art. It should be understood that the terminology used in these embodiments is merely for describing particular implementations and is not intended to limit the scope of the disclosure of these embodiments.

[0036] Unless otherwise stated, the technical and scientific terms used herein have the same meaning as commonly understood by one of ordinary skill in the art to which the embodiments of this invention pertain; other experimental methods and technical means not specifically noted in the embodiments of this invention refer to experimental methods and technical means commonly used by one of ordinary skill in the art.

[0037] The terms “basic” and “approximately” as used herein are used to describe small fluctuations. For example, they can mean less than or equal to ±5%, such as less than or equal to ±2%, such as less than or equal to ±1%, such as less than or equal to ±0.5%, such as less than or equal to ±0.2%, such as less than or equal to ±0.1%, such as less than or equal to ±0.05%. Numerical data presented or expressed in range format herein are used for convenience and brevity only, and should therefore be interpreted flexibly to include not only the explicitly listed values ​​that define the range, but also all independent values ​​or subranges contained within that range. For example, a numerical range of “1–5%” should be interpreted to include not only the explicitly listed values ​​from 1% to 5%, but also the independent values ​​and subranges within the indicated range. Thus, this numerical range includes independent values ​​such as 2%, 3.5%, and 4%, and subranges such as 1%–3%, 2%–4%, and 3%–5%, etc. This principle also applies to ranges that list only one value. Furthermore, this interpretation applies regardless of the width of the range or the characteristics described.

[0038] In this document, including in the claims, conjunctions such as "comprising," "including," "with," "having," "containing," "involving," and "accommodating" are understood to be open-ended, meaning "including but not limited to." Only the conjunctions "consisting of" and "composed of" are closed conjunctions.

[0039] To better illustrate the content of this invention, numerous specific details are provided in the following detailed embodiments. Those skilled in the art should understand that the invention can be practiced even without certain specific details. In the embodiments, some methods, means, instruments, and devices well-known to those skilled in the art are not described in detail, in order to highlight the main points of the invention.

[0040] Without conflict, the technical features disclosed in the embodiments of the present invention can be combined arbitrarily, and the resulting technical solution belongs to the content disclosed in the embodiments of the present invention.

[0041] In some embodiments, a method for preparing a high-reliability tantalum capacitor anode using recycled tantalum powder includes the steps of:

[0042] S1. Regenerated tantalum powder is subjected to deoxygenation reprocessing to obtain regenerated tantalum powder with low oxygen content;

[0043] Typically, recycled tantalum powder obtained from the dismantling and purification of conventional waste tantalum capacitors is selected, with an initial oxygen content ≥3000ppm. The recycled tantalum powder is then spread evenly inside a high-vacuum tube furnace, with the vacuum level controlled to <10. -3 The temperature is raised to 800–1000℃ and preheated at a constant temperature. High-purity magnesium vapor is continuously introduced to carry out a gas-phase reduction reaction, and the reaction is held at this temperature for 1–3 hours. During the holding period, the highly reducing magnesium vapor selectively reduces high-valence tantalum oxide impurities on the surface of tantalum particles and in the interstitial spaces of the lattice, removing free and bound oxygen from the powder. After the reaction, the powder is vacuum cooled to room temperature, screened, and the oxygen content of the regenerated tantalum powder is stably reduced to below 800 ppm, while preserving the original particle morphology of the tantalum powder to avoid corrosion and damage to the powder matrix.

[0044] S2. Low oxygen content recycled tantalum powder is modified by nano-tantalum nitride doping, so that nano-tantalum nitride particles are uniformly attached to the surface and interstices of the recycled tantalum powder particles.

[0045] Typically, high-purity regenerated tantalum powder after deoxygenation treatment is fed into a high-speed ball mixer for dry mechanical homogenization; the mass ratio of TaN nanopowder to regenerated tantalum powder is 0.05–0.5 wt%. The nano-TaN particles are uniformly attached to the surface and interstices of the tantalum powder particles, which can act as pinning agents during subsequent high-temperature sintering, effectively inhibiting abnormal grain growth and coarsening of the tantalum powder, ensuring the uniformity of powder particle size, and simultaneously improving the overall flowability and molding stability of the powder.

[0046] S3, nano-tantalum nitride doped and modified recycled tantalum powder is mixed with binder and formed into tantalum anode green blank;

[0047] Typically, the binder is a camphor / stearic acid composite binder, added at 0.1–0.3 wt% of the recycled tantalum powder mass. Adding 0.1–0.3 wt% of the camphor / stearic acid composite binder to the doped and modified tantalum powder and thoroughly mixing improves the hardness, brittleness, and poor flowability of the recycled tantalum powder, enhancing the powder's compressibility during pressing. The mixed powder is then placed into a standard anode mold and pressed using conventional pressure to obtain a regular, crack-free tantalum anode green blank.

[0048] S4. The tantalum anode green blank undergoes a two-stage gradient vacuum sintering process to obtain a sintered tantalum anode. In some embodiments, the two-stage gradient vacuum sintering includes: a first step, low-temperature pre-sintering at 1200℃ for 30–60 min to remove the internal binder; and a second step, high-vacuum main sintering at 1450–1600℃ for 1–2 h. Typically, during the first step of low-temperature pre-sintering at 1200℃, the internal binder is removed, the powder skeleton is initially solidified, internal stress is eliminated, and cracking of the green blank is avoided. During the second step of high-vacuum main sintering at 1450–1600℃, the metallurgical bonding of the powder particles is completed, forming a three-dimensional channel structure with uniform pore size and good pore connectivity, thus completely solving the problems of disordered channels and poor density after sintering of traditional recycled powder.

[0049] S5. Perform anodic energizing treatment on the sintered tantalum anode to form a Ta2O5 dielectric layer.

[0050] In some embodiments, the sintered tantalum anode is placed in a phosphoric acid electrolyte for anodic energization treatment, with the energizing voltage controlled at 120% of the rated voltage of the tantalum capacitor. Typically, the tantalum anode undergoes anodic energization treatment in a phosphoric acid electrolyte to ensure sufficient oxide film growth and the initial formation of a complete Ta2O5 dielectric layer.

[0051] Furthermore, some embodiments of the method for preparing high-reliability tantalum capacitor anodes using recycled tantalum powder further include the step of:

[0052] S6. The tantalum anode after the energy-enhancing treatment is immersed in an ethanol-modified solution containing ammonium dihydrogen phosphate. After thorough wetting, it is removed and subjected to low-temperature heat treatment. Typically, during the heat treatment process, ammonium dihydrogen phosphate generates a dense phosphate glass layer in situ at microcracks and micropore defects in the dielectric layer, precisely filling microscopic defects in the oxide film, sealing leakage channels, and significantly improving the density, voltage resistance, and anti-aging properties of the dielectric layer.

[0053] This invention utilizes a composite process of metallurgical reduction and oxygen reduction, nano-doping modification, gradient sintering, and dielectric layer defect repair. Without altering the anode structure and packaging specifications of tantalum capacitors, it simultaneously optimizes the purity, molding performance, and dielectric layer quality of recycled tantalum powder. This enables low-end recycled tantalum powder to achieve the electrical reliability of virgin tantalum powder, while avoiding the pollution problems associated with traditional strong acid treatment, thus realizing a high-value closed-loop recycling of tantalum metal.

[0054] Some embodiments disclose high-reliability tantalum capacitor anodes obtained by the method for preparing high-reliability tantalum capacitor anodes using recycled tantalum powder disclosed in the embodiments of the present invention.

[0055] Some embodiments disclose the application of high-reliability tantalum capacitor anodes for manufacturing high-reliability tantalum capacitors.

[0056] Some embodiments disclose high-reliability tantalum capacitors that include the high-reliability tantalum capacitor anode disclosed in the embodiments of the present invention.

[0057] The technical details are further illustrated below with reference to the embodiments.

[0058] Example 1

[0059] In Example 1, the method for preparing a high-reliability tantalum capacitor anode using recycled tantalum powder includes:

[0060] S1. Select waste recycled tantalum powder with an initial oxygen content of 3200ppm and place it under a vacuum of 8×10 -4 In a tubular furnace at 900°C, magnesium vapor was introduced for a reduction reaction for 2 hours, and the oxygen content of the tantalum powder was reduced to 720 ppm after treatment.

[0061] S2. Add 0.2wt% nano-TaN powder to the deoxygenated tantalum powder and mix at high speed for 30 minutes.

[0062] S3. Add 0.2wt% camphor / stearic acid composite binder, mix well, and press into a standard anode blank.

[0063] S4. Two-step sintering standard anode blank: pre-sintering at 1200℃ for 40 min, followed by high-vacuum sintering at 1500℃ for 1.5 h.

[0064] S5. Subsequently, the standard anode is energized in the phosphoric acid electrolyte at 120% of the rated voltage.

[0065] S6. The energized standard anode is immersed in ammonium dihydrogen phosphate ethanol solution and then heat-treated to repair defects.

[0066] The performance of the tantalum capacitor anode obtained in Example 1 was tested; the tests included:

[0067] (1) Oxygen content: Standardized test using an oxygen, nitrogen and hydrogen analyzer.

[0068] (2) Capacity testing: Test instrument: LCR meter, 2V DC bias + 0.5V AC (100Hz); Test solution: 10% H3PO4; Test temperature: room temperature 25℃. The energizing anode is completely immersed in the electrolyte, and the reading is taken directly after the reading stabilizes.

[0069] (3) Leakage current detection: Test instrument: leakage current tester; Test solution: 1.0% H3PO4; Test temperature: room temperature 25℃; Test voltage: 70% of the charging voltage; Charging time: 3min. The charging anode is completely immersed in the electrolyte, and the reading is taken directly after the test is completed.

[0070] (4) Breakdown voltage detection: Test instrument: voltage recorder; Test solution: energy-enhancing solution (conductivity 350 μS·cm) -1 (H3PO4 solution); Test temperature: Energizing temperature. The energizing anode is completely immersed in the electrolyte, and the voltage is continuously increased. When the voltage drops significantly, the maximum value before the drop is recorded as the breakdown voltage.

[0071] Meanwhile, as a comparison, the inventors conducted performance tests on tantalum capacitor anodes prepared from traditional recycled tantalum powder and tantalum capacitor anodes prepared from virgin tantalum powder. Table 1 lists the test data and comparisons.

[0072] Table 1. Test results of anodic performance of different tantalum capacitors

[0073]

[0074] The virgin tantalum powder only requires pressing and molding, without the need for a binder. Then, a vacuum sintering step is performed at a vacuum degree of 10. - 3 Pa, sintering temperature 1400~1500℃, holding time 30~90min. Finally, oxidation energization was performed under the same conditions as in Example 1. The energizing solution was phosphoric acid solution, and the standard anode was energized at 120% of the rated voltage.

[0075] The results show that the tantalum capacitor prepared in Example 1 has a 52% lower anode leakage current and a 21% higher breakdown voltage than the traditional regeneration process, and all performance indicators meet the standards for products prepared from virgin tantalum powder.

[0076] The method and application for preparing high-reliability tantalum capacitor anodes using recycled tantalum powder disclosed in this invention have at least the following beneficial technical effects:

[0077] 1. Significantly improved electrical performance: After vacuum phase oxygen reduction and dielectric defect repair, the leakage current of the anode prepared by regenerated tantalum powder is reduced by 40-60% compared with the traditional regeneration process, and the electrical performance is close to that of virgin high-purity tantalum powder; the overall anode breakdown voltage is increased by 20%, and the withstand voltage stability is significantly enhanced.

[0078] 2. Improved stability in forming and mass production: By using TaN nano-doping and composite additives, and gradient sintering process, the industry problems of hardness and brittleness, poor fluidity, pressing delamination and cracking, and uneven sintering porosity of recycled tantalum powder are completely solved. The qualified rate of anode blank forming is greatly improved, and industrial mass production can be stably achieved.

[0079] 3. Cost advantage: The cost of recycled tantalum powder raw materials used in this process is only 30-50% of that of virgin high-purity tantalum powder. Under the premise of meeting performance standards, it significantly reduces the production cost of high-end tantalum capacitors and is suitable for large-scale promotion.

[0080] 4. Green, environmentally friendly and pollution-free: It abandons the polluting processes such as hydrofluoric acid strong acid etching and high-temperature incineration required by traditional recycling processes. The entire process adopts gas phase reduction, dry doping and low temperature modification processes, with no strong corrosive waste liquid or waste gas emissions, realizing the green closed-loop recycling of tantalum metal resources.

[0081] 5. High versatility: The entire process does not change the size, structure, or packaging of the tantalum capacitor, and can be directly adapted to existing tantalum capacitor production lines without equipment modification. It is compatible with the anode preparation of various specifications of solid and liquid tantalum capacitors.

[0082] The technical solutions and technical details disclosed in the embodiments of this invention are merely illustrative of the inventive concept of this invention and do not constitute a limitation on the technical solutions of the embodiments of this invention. Any conventional changes, substitutions, or combinations made to the technical details disclosed in the embodiments of this invention have the same inventive concept as this invention and are within the protection scope of the claims of this invention.

Claims

1. A method for preparing high-reliability tantalum capacitor anodes using recycled tantalum powder, characterized in that, Including the following steps: S1. Regenerated tantalum powder is subjected to deoxygenation reprocessing to obtain regenerated tantalum powder with low oxygen content; S2. Low oxygen content recycled tantalum powder is modified by nano-tantalum nitride doping, so that nano-tantalum nitride particles are uniformly attached to the surface and interstices of the recycled tantalum powder particles. S3, nano-tantalum nitride doped and modified recycled tantalum powder is mixed with binder and formed into tantalum anode green blank; S4. The tantalum anode green billet is subjected to two-stage gradient vacuum sintering to obtain the sintered tantalum anode; S5. Perform anodic energizing treatment on the sintered tantalum anode to form a Ta2O5 dielectric layer.

2. The method for preparing a high-reliability tantalum capacitor anode using recycled tantalum powder according to claim 1, characterized in that, It also includes the following steps: S6. The tantalum anode after the energy-enhancing treatment is immersed in an ethanol-modified solution containing ammonium dihydrogen phosphate. After being fully wetted, it is taken out and subjected to low-temperature heat treatment.

3. The method for preparing a high-reliability tantalum capacitor anode using recycled tantalum powder according to claim 1 or 2, characterized in that, Step S1 specifically includes: The recycled tantalum powder was spread evenly inside a high-vacuum tube furnace, and the vacuum level inside the furnace was controlled to be <10. -3 Pa, heat to 800-1000℃ and preheat at a constant temperature; High-purity magnesium vapor is continuously introduced to carry out a gas-phase reduction reaction, and the reaction is kept at a temperature for 1 to 3 hours. After the reaction is complete, the mixture is cooled to room temperature under vacuum and then screened to obtain powder.

4. The method for preparing a high-reliability tantalum capacitor anode using recycled tantalum powder according to claim 1 or 2, characterized in that, Step S2 specifically includes: High-purity regenerated tantalum powder after deoxygenation treatment is added to a high-speed ball mixer and 0.05-0.5 wt% of TaN nanopowder for dry mechanical uniform mixing.

5. The method for preparing a high-reliability tantalum capacitor anode using recycled tantalum powder according to claim 1 or 2, characterized in that, In step S3, the binder is a camphor / stearic acid composite binder, and the amount added is 0.1 to 0.3 wt% of the mass of the recycled tantalum powder.

6. The method for preparing a high-reliability tantalum capacitor anode using recycled tantalum powder according to claim 1 or 2, wherein step S4, the two-stage gradient vacuum sintering includes: The first step is to pre-sinter at a low temperature of 1200℃ for 30-60 minutes to remove the internal adhesive. The second step is to raise the temperature to 1450-1600℃ for high-vacuum sintering and hold it at that temperature for 1-2 hours.

7. The method for preparing a high-reliability tantalum capacitor anode using recycled tantalum powder according to claim 1 or 2, step S5 specifically includes: The sintered tantalum anode is placed in a phosphoric acid electrolyte for anode energization treatment, with the energization voltage controlled at 120% of the rated voltage of the tantalum capacitor.

8. A high-reliability tantalum capacitor anode, characterized in that, It is obtained by the method for preparing a high-reliability tantalum capacitor anode using recycled tantalum powder as described in any one of claims 1 to 7.

9. The application of the anode of the high-reliability tantalum capacitor as described in claim 8, characterized in that, The anode of the high-reliability tantalum capacitor is used to manufacture high-reliability tantalum capacitors.

10. A high-reliability tantalum capacitor, characterized in that, It includes the high-reliability tantalum capacitor anode as described in claim 8.

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