Published Jul 31, 2023 03:29AM ET Updated Jul 31, 2023 03:36AM ET © Reuters. FILE PHOTO: A Chargepoint level 2 electric vehicle (EV) charging station is seen outside the Corona Public Library in Corona, New Mexico, U.S., March 15, 2023. REUTERS/Bing Guan/FILE PHOTO PKX +5.11% Add to/Remove from Watchlist 005930 -1.13% Add to/Remove from Watchlist By Heekyong Yang and Zoey Zhang SEOUL/SHANGHAI (Reuters) – Chinese battery materials firms are ramping up investment in South Korea, announcing projects worth at least $4.4 billion this year to try to meet U.S. electric vehicle (EV) tax credit rules aimed at lowering reliance on…