Three scientists have been awarded the 2019 Nobel Prize in Chemistry for the development of lithium-ion batteries.
John B Goodenough, M Stanley Whittingham and Akira Yoshino share the prize for their work on these rechargeable devices, which are used for portable electronics.
At the age of 96, Prof Goodenough is the oldest person to win the award.
The laureates will share the prize money of nine million kronor (£738,000).
The awards were announced at the Royal Swedish Academy of Sciences in Stockholm.
Previous winners of the Nobel Prize in Chemistry
2018 – Discoveries about enzymes earned Frances Arnold, George P Smith and Gregory Winter the prize
2017 – Jacques Dubochet, Joachim Frank and Richard Henderson were awarded the prize for improving images of biological molecules
2016 – Jean-Pierre Sauvage, Fraser Stoddart and Bernard Feringa shared the prize for the making machines on a molecular scale.
2015 – Discoveries in DNA repair earned Tomas Lindahl and Paul Modrich and Aziz Sancar the award.
2014 – Eric Betzig, Stefan Hell and William Moerner were awarded the prize for improving the resolution of optical microscopes.
2013 – Michael Levitt, Martin Karplus and Arieh Warshel shared the prize, for devising computer simulations of chemical processes.
2012 – Work that revealed how protein receptors pass signals between living cells and the environment won the prize for Robert Lefkowitz and Brian Kobilka.