CATL, which had capacity to produce 7.6 gigawatt hours of batteries last year according to Goldman Sachs, says that by 2020 it plans to produce more than the gigafactory, the Tesla Motors and Panasonic joint venture that opened in Nevada in January and is expected to be the largest producer in the US. That would potentially make it the biggest battery factory in the world. ... Backed by aggressive government policies —ranging from subsidies for electric vehicles to restrictions on foreign rivals — China’s battery companies are beginning to dominate an industry which has been led for three decades by South Korean and Japanese manufacturers such as Panasonic, which makes the battery cells for Tesla cars. ... As carmakers invest more heavily in electric vehicles the lithium-ion battery will be a key technology for at least the next decade ... worth $40bn by 2025 and dominated by China.