Solid-State Battery Electrode Structure for Gas Discharge
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Solution Overview
Problem
All solid-state batteries using a solid electrolyte face issues with gas produced during charging and discharging becoming trapped, leading to increased interfacial resistance and reduced battery lifespan.
Innovation Solution
An electrode for all solid-state batteries is designed with an electrode current collector and an electrode active material layer, where the active material particles are connected by a solid electrolyte and a linear structure, such as halloysite nanotubes, allowing for gas discharge through micropores formed between the particles and the linear structure.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If a solid electrolyte is used in an all-solid-state battery, then safety is enhanced and energy density is improved, but gas produced during charging and discharging becomes trapped in the electrode, leading to increased interfacial resistance and shortened service life
Solution Approach 1:
The patent introduces a porous coating layer on the solid electrolyte surface that contains numerous micropores. These micropores serve as gas discharge channels, allowing gas produced during charging and discharging to escape from the electrode structure. This prevents gas accumulation and maintains low interfacial resistance while preserving the benefits of solid electrolyte usage.
Solution Approach 2:
The solid electrolyte surface is segmented into multiple micropores distributed throughout the porous coating layer. This segmentation creates numerous discrete gas escape pathways, ensuring that gas can be effectively discharged from various locations within the electrode structure, preventing localized gas trapping that would increase interfacial resistance.
2Volume of stationary object
If gas is trapped in the electrode during charging and discharging, then the battery structure remains compact, but interfacial resistance increases and service life is shortened
Solution Approach 1:
The porous coating layer with micropores provides gas discharge channels without significantly increasing the overall electrode volume. The micropores are distributed throughout the coating layer, creating an efficient gas escape network that maintains compact electrode structure while preventing gas accumulation that would harm service life.
Solution Approach 2:
The porous coating layer is applied locally on the solid electrolyte surface rather than throughout the entire electrode structure. This localized modification provides gas discharge functionality at the critical electrode-electrolyte interface while maintaining the compactness of the bulk electrode structure.
Data Source
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AI summary
The present disclosure relates to an electrode for an all solid-state battery including an electrode current collector, and an electrode active material layer formed on at least one surface of the electrode current collector, wherein the electrode active material layer includes a plurality of electrode active material particles, a solid electrolyte coated on at least part of surface of the plurality of electrode active material particles to connect the plurality of electrode active material particles, and a linear structure distributed between the plurality of electrode active material particles.