Japanese scientist Akira Yoshino, one of the three winners of this year's Nobel Prize in Chemistry, has left for Sweden to attend an award ceremony next week.
Yoshino, who was awarded the prestigious prize for the development of lithium-ion batteries, and his wife Kumiko spoke to reporters at Narita airport before their departure on Thursday.
Yoshino said that he has not decided yet on how to wrap up the speech he will deliver at the award ceremony in Stockholm. He added that he will consider his closing remarks until the last minute.
He also said that he wants his Nobel lecture to provide a path to a solution to environmental issues.
Yoshino noted that one of reasons he won the prize is that rechargeable lithium-ion batteries he has helped develop are environmentally friendly.
His wife Kumiko said the weeks have passed in a flash since she learned of her husband's prize in October.
Yoshino is scheduled to deliver his Nobel lecture on Sunday and attend the award ceremony on Tuesday.