SEOUL--South Korea's LG Chem Ltd. has secured a deal worth hundreds of millions of dollars to supply electric vehicle batteries to Audi AG, a unit of German auto maker Volkswagen AG.

LG Chem, the world's largest battery maker by sales, didn't disclose details of the deal, but said the contract would help Volkswagen's efforts to revive the sluggish growth of emission-free vehicles globally.

"The batteries will be used in Audi's next-generation plug-in hybrid electric vehicles. Given that Audi shares many auto platforms with parent Volkswagen, we expect more such deals from the German auto group, " LG said in a statement on Wednesday.

It didn't disclose the exact value of the deal but said it is worth hundreds of billions of won. It also declined to reveal when it will start delivering the contracted batteries, and said the timing is closely linked to the launch of Audi's new electric vehicles.

LG Chem currently produces batteries for electric-car models made by auto makers such as General Motors Co., Renault SA, Ford Motor Co., Hyundai Motor Co. and Kia Motors Corp.

The deal comes as several European auto makers, including BMW AG, Volkswagen and Daimler AG's Mercedes-Benz unit, are introducing electric-propulsion vehicles this year to comply with strict new emission rules in Europe.

Despite an aggressive move by the car makers to push electric vehicles, a campaign that has included free charging stations and a raft of price cuts and cheap lease deals, the vehicles haven't been hot sellers globally.

Other obstacles to their sales include overcoming buyers" concerns about the vehicles" short driving range, long charging times and the lack of charging stations.

LG Chem announced last week that it is jointly developing, with GM and other global auto makers, a battery pack that can attain 200 miles of driving range on a single charge--more than double that of most electric vehicles on the road today.

LG, which has factories in the U.S. and South Korea, said in July it will build another electric-car battery plant in China by next year, betting on rapid growth in the world's biggest car market.

Write to In-Soo Nam at In-Soo.Nam@wsj.com

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