Faraday Future’s FFZERO1 Concept car at the Consumer Electronics Show in Las Vegas in January . (ROBYN BECK/AFP/Getty Images)

Faraday Future, the Los Angeles-based automotive startup backed by Chinese billionaire Jia Yueting, formed a partnership with South Korea’s LG Chem to supply lithium-ion cells for electric vehicles it’s developing but has yet to reveal.

Under the agreement the two companies will work together to develop batteries with the highest energy density in the auto industry, they said in a statement. Faraday Future, a would-be competitor to Elon Musk’s Tesla, has said it plans to introduce a line of connected, electric vehicles that offer new types of mobility solutions. So far, it’s only shown the FFZERO1, a high-powered concept electric race car reminiscent of the Batmobile. Still, spy photos indicate the company has more conventional designs in the works.

“LG Chem worked closely with Faraday Future to develop a tailored cell chemistry to optimize the range and safety of our mass-production battery hardware,” Tom Wessner, Faraday Future’s vice president of global supply chain, said in a statement. The company, with headquarters in Gardena, a Los Angeles suburb, has yet to say when its first model will go on sale, what it will cost and what specific features will distinguish it from other electric cars.

Key to Faraday Future’s approach is its “VPA” platform, a flexible architecture that’s designed to underpin a broad range of vehicle types and body styles.

LG Chem has become a leading supplier of advanced automotive batteries, providing lithium-ion cells for models including General Motors’ Volt plug-in hybrid and new Bolt all-electric hatchback, with driving range of more than 230 miles per charge.

Jia, chairman of Chinese technology and entertainment firm LeEco, along with backing Faraday Future has also invested in Atieva, another California-based electric car startup. In April, LeEco unveiled its own LeSee model in Beijing, a self-driving, electric concept car. At the debut, LeEco said the LeSee would have “groundbreaking, fully autonomous capabilities, including machine learning of facial, emotion, system and path recognition.”

LeEco and Faraday Future share an autonomous driving research center in California’s Silicon Valley, and in April LeEco opened its U.S. headquarters in San Jose.

Despite the fact that it has yet to detail its planned vehicles, Faraday Future broke ground in April on a $1 billion assembly plant near Las Vegas. In July Nevada Treasurer Dan Schwartz  said he was skeptical Jia can secure financing for the plant, which needs state assistance for infrastructure to support the facility.

Whatever Faraday Future’s new vehicle looks like and does, it’s going to have to be very compelling. While overall sales of electric vehicles are growing as more manufacturers add them to their lineups to meet U.S. fuel economy requirements, sustained cheap gasoline has been a drag on demand for nearly two years.