https://www.reuters.com/article/us-sk-innovation-lg-chem-lawsuit/sk-innovation-intensifies-lg-chem-feud-with-ev-battery-patent-lawsuit-idUSKCN1VK034 >A feud between two South Korean battery makers escalated on Friday as SK Innovation Co Ltd said it plans to sue bigger rival LG Chem Ltd in the United States over alleged patent infringement related to electric vehicles (EV).