Electrode composite, battery, and method for producing the same

The electrode composite with unevenly distributed particles of varying sizes and aspect ratios enhances contact between electrode and electrolyte layers, addressing interface challenges in all-solid-state batteries and improving battery output and safety.

JP2025117423APending Publication Date: 2025-08-12CANON KK
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Patent Information

Application Number
JP2024012253
Authority / Receiving Office
JP · JP
Patent Type
Applications
Current Assignee / Owner
Filing Date
2024-01-30
Publication Date
2025-08-12

AI Technical Summary

Technical Problem

All-solid-state batteries face challenges in forming a good interface between electrode active material particles and solid electrolyte particles, particularly in oxide-based batteries, leading to high resistance and limited output, despite existing techniques like sintering and surface protrusions not adequately addressing the issue.

Method used

An electrode composite with a positive electrode active material layer containing first and second particles of varying sizes and aspect ratios, where the second particles are distributed unevenly to enhance contact with the solid electrolyte, and a manufacturing method involving pressure, current application, and sintering in an oxygen-containing atmosphere.

Benefits of technology

The electrode composite achieves improved contact and reduced short-circuit risk, resulting in high output and efficient battery performance.

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Abstract

To provide an electrode composite which is a laminate of a positive electrode layer and a solid electrolyte layer in which a contact property between electrode active material particles and solid electrolyte particles is good and a short circuit is unlikely to occur and a good battery output is obtained, a secondary battery which uses the electrode composite and has a high output and is capable of reducing a risk of a short circuit, and a method for producing the same.SOLUTION: In an electrode composite applied to a secondary battery, the electrode composite includes a positive electrode active material layer and an electrolyte layer, the positive electrode active material layer has a first surface in contact with the electrolyte layer and a second surface located on an opposite side of the first surface, and includes a plurality of first active material particles and a plurality of second active material particles having a higher average aspect ratio than the plurality of first active material particles. The position of the center of gravity of the plurality of second active material particles is located farther from the first surface than the position of the center of gravity of the plurality of first active material particles.SELECTED DRAWING: Figure 18
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Citation Information

Patent Citations

  • Electrode plate for nonaqueous electrolyte secondary battery and nonaqueous electrolyte secondary battery

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  • Active material, manufacturing method of the same, electrode, and battery

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    JP2021034205A