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Solid-state sodium battery high-load electrode and preparation method and application thereof

A sodium battery, solid-state technology, which is applied to high-capacity electrodes of solid-state sodium batteries and their preparation and application fields, can solve the problems of inability to achieve, reduce interface impedance, and complex processes.

Active Publication Date: 2020-12-22
SHANGHAI INST OF CERAMIC CHEM & TECH CHINESE ACAD OF SCI
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

These methods have improved the interfacial contact between the solid electrolyte and the electrode to a certain extent, but there are also problems of complex processes and high equipment requirements.
Moreover, the above research is mainly to improve the interface, without changing the design of the structure of the electrolyte itself, and cannot achieve the purpose of reducing the interface impedance and increasing the material loading of the electrode.

Method used

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  • Solid-state sodium battery high-load electrode and preparation method and application thereof
  • Solid-state sodium battery high-load electrode and preparation method and application thereof
  • Solid-state sodium battery high-load electrode and preparation method and application thereof

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preparation example Construction

[0043] The preparation method of the high-capacity electrode of the solid-state sodium battery allows the electrode active material to be filled into the electrolyte porous layer as much as possible, thereby increasing the loading capacity of the electrode active material. The loading capacity per unit area of ​​the positive active material is 1-20 mg / cm 2 . The area refers to the area of ​​the ceramic pole piece. Specifically, in an embodiment, the loading amount of the electrode active material may be 1-20 mg, preferably 4-8 mg.

[0044] The present invention also provides a method for loading negative electrode active materials. Metal sodium is melted and infiltrated into the porous electrolyte layer as the negative electrode, which relieves the stress concentration caused by the uneven deposition of sodium during the battery charge-discharge cycle, destroys the dense electrolyte layer, and effectively prevents the formation of sodium dendrites, further improving battery ...

Embodiment 1

[0051] First put 6g of beta-Al 2 o 3 The powder was dissolved in 10 g of tert-butanol (solid content 35%, mass percentage)), and 1 g of polymerization agent PEG was added thereto, and stirred on a heating platform at 40° C. for 4 h to form a porous layer slurry. Then, a sponge template with a diameter of 16 mm was used to absorb the porous layer slurry, placed on a semiconductor refrigerator at -50°C for vertical freeze-drying, and placed in a freeze dryer for 12 hours. Finally, it is sintered at 1000° C. for 2 h with a heating rate of 2° C. / min to obtain a vertical porous structure. One side of the vertical porous structure is repeatedly impregnated with the dense layer slurry, and sintered at 1550°C for 10 minutes by buried powder sintering method to obtain a porous / dense composite structure beta-Al 2 o 3 Electrolyte (the schematic diagram is as figure 1 shown). The porosity of the porous layer measured by the Archimedes method was 54%. Sodium vanadium phosphate was sy...

Embodiment 2

[0053] Preparation of beta-Al with porous and dense composite structure 2 o 3 Electrolyte, specific implementation steps with reference to embodiment 1, only change the beta-Al in the porous layer slurry 2 o 3 The amount of powder added reaches the purpose of adjusting the solid content, so that the solid content is 40%. The porosity of the porous layer measured by the Archimedes method is 50%. Sodium vanadium phosphate was synthesized by sol-gel method, and sodium vanadium phosphate was dissolved in NMP to form a solution, and then the solution was dropped into the porous layer, and the solvent was evaporated at 100°C, so that the active material sodium vanadium phosphate was successfully loaded on the porous layer of the electrolyte. In the pores, a porous / dense composite structure ceramic loaded with active substances is formed. The obtained porous / dense composite structure ceramics loaded with active materials were used as the positive electrode and electrolyte, the so...

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Abstract

The invention discloses a high-load electrode of a solid-state sodium battery and a preparation method and application of the high-load electrode. The high-capacity electrode of the solid-state sodiumbattery is porous / compact composite structure ceramic loaded with an active substance, and comprises a porous / compact composite structure solid electrolyte and an electrode active substance filled inpores of the porous / compact composite structure solid electrolyte; preferably, the porous / compact composite structure solid electrolyte is a solid electrolyte with a vertical porous structure; more preferably, the electrode active material is synthesized in situ and filled in pores of the porous compact composite structure solid electrolyte. According to the high-load electrode of the solid-statesodium battery, the interface contact area of the electrode and the solid electrolyte is increased, the interface impedance is reduced, meanwhile, the active substance load of the electrode is improved, and then the actual specific energy of the battery is improved.

Description

technical field [0001] The invention relates to a high-capacity electrode for a solid-state sodium battery and its preparation method and application, in particular to a method for loading electrode active materials in a porous layer of a solid electrolyte with a porous / dense composite structure. Background technique [0002] Solid-state sodium batteries have the advantages of excellent thermal stability, no leakage and volatilization, non-flammability, and reduced fire occurrence. In addition, the sodium ion solid electrolyte has a high electrochemical window, which can be better matched with the electrode material, has good cycle performance and long life, and can be used for a long time in the field of electric vehicles, reducing the cost of battery replacement. However, the contact interface between the electrode and the electrolyte of a solid-state sodium battery is a solid-solid contact, and the contact area is small, resulting in a large interface impedance, and the e...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H01M4/13H01M4/139H01M10/054
CPCH01M4/13H01M4/139H01M10/054H01M2004/021Y02E60/10
Inventor 温兆银赖红健吴相伟王静宜靳俊
Owner SHANGHAI INST OF CERAMIC CHEM & TECH CHINESE ACAD OF SCI
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