Solid-State Batteries
A solid-state battery differs from today’s lithium-ion or lithium polymer batteries in that it uses solid electrodes and a solid electrolyte, instead of liquid or polymer gel electrolytes. As both the electrodes and the electrolyte are solid state, the solid electrolyte also behaves as the separator, allowing volume and weight reduction due to the elimination of certain components. In addition, the removal of flammable liquid electrolytes can be an avenue for safer, longer-lasting batteries as they are more resistant to changes in temperature and physical damages which occur during usage. While the concept has been known for decades, implementation has been challenged in the past by short lifetimes and slow charging rates. However, in 2020 Volkswagen-backed QuantumScape announced a breakthrough of its single-layer solid-state battery cells with much higher energy density, significantly increasing the drivable range per charge of electric vehicles, as well as the ability to fast charge to 80% in 15 minutes. According to Kent Helfrich, Executive Director, Global Electrification and Battery Systems at General Motors and other known experts in the industry, there is potential for at least a 50% reduction A solid-state battery differs from today’s lithiumion or lithium polymer batteries in that it uses solid electrodes and a solid electrolyte, instead of liquid or polymer gel electrolytes. As both the electrodes and the electrolyte are solid state, the solid electrolyte also behaves as the separator, allowing volume and weight reduction due to the elimination of certain components. In addition, the removal of flammable liquid electrolytes can be an avenue for safer, longer-lasting batteries as they are more resistant to changes in temperature and physical damages which occur during usage. While the concept has been known for decades, implementation has been challenged in the past by short lifetimes and slow charging rates. However, in 2020 Volkswagen-backed QuantumScape announced a breakthrough of its single-layer solid-state battery cells with much higher energy density, significantly increasing the drivable range per charge of electric vehicles, as well as the ability to fast charge to 80% in 15 minutes. According to Kent Helfrich, Executive Director, Global Electrification and Battery Systems at General Motors and other known experts in the industry, there is potential for at least a 50% reduction in battery pack cost over the next several years, putting the cost of an electric vehicle at or below parity compared to the internal combustion engine. This could be a game changer for electric vehicles.