HONG KONG – One of China ’s leading lithium producers has started marketing what is expected to be Hong Kong ’s biggest initial public offering so far this year, braving recent market volatility to test investors’ appetites. markets for the shares of new energy companies. Lithium Tianqi Corp. 002466 -1.01% aims to raise more than $1 billion in a listing on the Hong Kong stock exchange, according to people familiar with the matter. The Chengdu, China -based company , which claims to be one of the world’s largest producers of battery-grade lithium compounds , has been listed in Shenzhen since...