SHANGHAI, Oct 10 (Reuters) – Shares of Chinese battery makers plunged on Friday after the country announced that it would control exports of lithium battery parts, a move that tightens its grip on the technology critical for energy storage and electric vehicles .

It had earlier expanded export controls over rare earths as trade tensions with the United States simmer ahead of a possible meeting between Presidents Donald Trump and Xi Jinping later this month.

Beijing’s export control on some high-end lithium-ion batteries, cathodes and graphite anode material as well as technological know-how will require exporters to seek permits and set to take effect from November 8, per a Ministry of Commerce statement on Thursday. 5

On Friday, battery maker Contemporary Amperex Technology Co

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