By Pratima Desai LONDON (Reuters) -CME Group is talking to market participants about the idea of a cash-settled nickel contract for companies to hedge costs of the electric vehicle battery raw material, two sources with knowledge of the matter said. Market participants say a viable alternative trading venue would give disgruntled users the opportunity to move away from the London Metal Exchange (LME) where nickel trading was thrown into chaos early in March. Nickel prices on the LME doubled to a record above $100,000 a tonne within hours in March – as war in major producer Russia lit a fire un…