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  2. Solid-state battery - Wikipedia

    en.wikipedia.org/wiki/Solid-state_battery

    In July 2022, Svolt announced the production of a 20 Ah electric battery with an energy density of 350-400 Wh/kg. [43] In June 2023, Maxell Corporation began mass production of large-capacity solid-state batteries. This battery has a long life and heat resistance. Production of 200 mAh cylindrical solid-state batteries was to begin in January 2024.

  3. Research in lithium-ion batteries - Wikipedia

    en.wikipedia.org/wiki/Research_in_lithium-ion...

    The device achieved a power density of 7.4 W/cm 2 /mm. [56] In 2019, the team develop a high areal and volumetric capacity 3D-structured tin-carbon anode by using a two steps electroplating process, which exhibits a high volumetric/areal capacity of ~879 mAh/cm 3 and 6.59 mAh/cm 2 after 100 cycles at 0.5 °C and 750 mAh/cm 3 and 5.5 mAh/cm 2 ...

  4. Radio - Wikipedia

    en.wikipedia.org/wiki/Radio

    The word radio is derived from the Latin word radius, meaning "spoke of a wheel, beam of light, ray".It was first applied to communications in 1881 when, at the suggestion of French scientist Ernest Mercadier [], Alexander Graham Bell adopted radiophone (meaning "radiated sound") as an alternate name for his photophone optical transmission system.

  5. High availability - Wikipedia

    en.wikipedia.org/wiki/High_availability

    However, given the true definition of availability, the system will be approximately 99.9% available, or three nines (8751 hours of available time out of 8760 hours per non-leap year). Also, systems experiencing performance problems are often deemed partially or entirely unavailable by users, even when the systems are continuing to function.