Publications Details
Quarterly update for VTO XFC project
Since the last update, Sandia has performed additional testing on COTS baseline cells, as well as initial testing of University of Michigan baseline graphite anode cells. The COTS cell testing included an extreme stress test using 12C charging, as well as a non-cooled 6C charging test to determine the effectiveness of cooling plates. The Michigan cells were cycled with increasing charge rates to determine rate capability and possible propensity for lithium plating. The COTS cells are 5Ah NMC/Graphite pouches from Kokam with a modest 112 Wh/kg. The University of Michigan cells are NMC ~2.6Ah NMC/Graphite pouches made at the UM Battery Lab, and were designed with a more aggressive energy density. On the horizon, we will be testing additional cells from University of Michigan, including a baseline hard carbon anode cell. We will also disassemble the graphite anode cell, and continue to analyze the dQdV signals obtained during the graphite cell experiment to further understand evidence of possible plating. We also expect to receive cells with improved anodes for eventual testing against baselines.