Spot lithium carbonate prices assessed by Fastmarkets fell to 260,000 yuan ($38,079.06) per tonne this week, less than half the price quoted last November.
Five analysts polled by Reuters last month had expected the price would drop to 300,000 yuan by the end of this year.
"The unprecedented price cuts among traditional auto makers will eat EVs' market share in the short term, hitting lithium demand further," said Vicky Zhao, a Beijing-based senior analyst at Fastmarkets.
Lithium prices in the United States and Europe have also fallen, albeit less sharply, amid rising but still tight supplies and a stronger outlook for EV sales.
($1 = 6.8279 Chinese yuan renminbi)Reporting by Siyi Liu and Dominique Patton; Editing by Sonali PaulOur Standards: The Thomson Reuters Trust Principles.