Solid-state batteries replace the liquid or polymer gel electrolyte of conventional batteries with a solid, ion-conducting material, such as a ceramic or solid polymer. This design aims to improve safety by eliminating flammable liquid electrolytes and to increase energy density and durée de vie by enabling the use of high-capacity anodes, particularly pure lithium metal.
Solid-State Battery Principle
The core innovation of a solid-state battery is the solid electrolyte. This component must fulfill the challenging dual role of being an excellent conductor for ions while being a perfect electrical insulator to prevent internal short circuits. Researchers are exploring several classes of materials, including inorganic crystalline ceramics (e.g., garnet-type LLZO – Li₇La₃Zr₂O₁₂), amorphous glassy ceramics, and solid polymers.
The primary motivation is safety. Conventional lithium-ion batteries use flammable organic liquid electrolytes, which can leak and catch fire in cases of damage or malfunction, a phenomenon known as thermal runaway. A solid, non-flammable electrolyte inherently mitigates this risk. Beyond safety, the solid electrolyte is a key enabler for next-generation anode materials. The ultimate anode is pure lithium metal, which offers the highest theoretical energy density. However, in liquid electrolytes, lithium metal tends to form needle-like structures called dendrites during charging. These dendrites can grow across the separator, short-circuit the cell, and cause a fire.
A mechanically robust solid electrolyte can act as a physical barrier, suppressing dendrite growth and allowing for the safe use of a lithium metal anode. This could lead to batteries with significantly higher energy density (more range for an EV) and a longer cycle life. Key challenges remain in achieving high ionic conductivity at room temperature, maintaining stable interfaces between the solid electrolyte and the electrodes during volume changes, and developing cost-effective fabrication processes.
Type
Disruption
Utilisation
Precursors
- Discovery of ionic conductivity in solid materials by Michael Faraday
- Development of lithium-ion battery chemistry and electrode materials
- Advances in ceramic science and thin-film deposition techniques
- Theoretical understanding of ion transport in solids
Applications
- pacemakers and other implantable medical devices
- RFID tags and smart cards
- portable capteurs
- next-generation electric vehicles (in development)
- aerospace and defense systems
Brevets :
Potential Innovations Ideas
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Historical Context
Solid-State Battery Principle
(if date is unknown or not relevant, e.g. "fluid mechanics", a rounded estimation of its notable emergence is provided)
Related Invention, Innovation & Technical Principles