The S&P/ASX 200 (INDEXASX: XJO) ended Thursday flat but the selloff in lithium stocks has returned once again, with the Pilbara Minerals Ltd (ASX: PLS) share price, Liontown Resources Ltd (ASX :LTR) share price and Lake Resources Ltd (ASX: LKE) share price pushing the commodities sector to a 1.5 per cent loss.