Japan's Toyota Motor is set to launch in a couple of years vehicles with solid-state batteries that charge faster and last longer, a top official from its Indian unit said on Thursday.

Solid-state batteries promise to dramatically improve the driving range of electric vehicles (EVs), a key element of a strategic pivot Toyota unveiled in June to make up for ground lost to Tesla and Chinese rivals, such as BYD, in the EV race.

Last year, Toyota and oil refiner Idemitsu Kosan said they would tie up to develop and mass produce all-solid-state batteries, which they aim to commercialise in 2027 and 2028, followed by full-scale mass production.

"We are rolling out an electric vehicle with solid state batteries in a couple of years from now," Vikram Gulati, country head of Toyota Kirloskar Motor, said at an investment summit in the western state of Gujarat.

"The solid-state batteries can be charged in 10 minutes and have a range of 1,200 km (750 miles)."

Thousands of chief executives, investors and diplomats have gathered for the three-day event at which big global and Indian firms have unveiled investment plans worth nearly $33 billion.

Toyota's partner and India's top car maker Maruti Suzuki said on Wednesday it would invest 350 billion rupees ($4.2 billion) to build a second car plant in Gujarat and add a new production line at an existing plant there.

"Electrification is a process whose time has come and it will happen," said Rahul Bharti, executive director at Maruti Suzuki, adding it will begin exporting EVs to Europe and Japan this year.

India's transport minister Nitin Gadkari told the summit he anticipated EV sales in India, the world's third largest auto market, would reach 10 million units by 2030.

Electric models accounted for just around 2% of India's car sales last year, but the national government is targeting 30% by 2030 and is working on a new policy to attract EV makers. (Reporting by Aditi Shah in Gandhinagar, Writing by Bansari Mayur Kamdar; Editing by YP Rajesh and Mark Potter)