If a EV battery today cost ,we will say $10k with a range of 400 km,then what would that battery be worth with a range of 1200 km?maybe twice as much or more?So it adds $10k to the EV.How much silicon would be usé in the battery, grams/kilograms,I don't know,but I assume the price f the silicon will be based on the value added to the final product.Untill they work the bugs out of the silicon anode,and discover it true value the price will remain  unknown.

  Just saw an ad for the 3 pwer packs in a 2017 Chevy volt, they cost right around  $10k for all 3.                                                                                                                                                                                                                          Graphite is the most commonly used material for EV battery anodes. 25kg of high purity graphite is needed for an average-sized battery, and up to 54kg for large batteries such as those used in the Tesla Model S.

The process for manufacturing graphite anodes is a time-consuming and costly one. It involves creating synthetic graphite made from calcined or cleaned petroleum coke (an oil refinery by-product), a fine, gravelly material, which is bound together with coal tar pitch. For maximum absorption of lithium ions, the graphite used for the anode has to be high-quality, with a highly crystalline structure