We’ve been reading and sharing reports about Tesla’s potential million-mile battery for some time now. This doesn’t come as too much of a surprise since many EV batteries have already been proven to last a very long time. Moreover, Tesla CEO Elon Musk shared that the battery pack in the current Model 3 should already last some 300,000 to 500,000 miles.
Now, a new patent entitled ‘Dioxazolones and nitrile sulfites as electrolyte additives for lithium-ion batteries’ references adjustments to battery cell chemistry for the company’s cars and energy storage products. The new chemistry aims to increase battery performance and longevity while reducing costs.
According to the patent application:
“This disclosure covers novel battery systems with fewer operative, electrolyte additives that may be used in different energy storage applications, for example, in vehicle and grid-storage. More specifically, this disclosure includes additive electrolyte systems that enhance performance and lifetime of lithium-ion batteries, while reducing costs from other systems that rely on more or other additives.”
“Improved battery systems have been developed for lithium-ion based batteries. The improved systems include a nonaqueous electrolyte including one or more lithium salts, one or more nonaqueous solvents, and an additive or additive mixture comprising one or more operative additives selected from a group of disclosed compounds, including 3-aryl substituted 1,4,2- dioxazol-5-ones and 3-phenyl-1,3,2,4-dioxathiazole 2-oxide.”
More specifically, this patent refers to NMC battery chemistry:
“This work characterizes the high-temperature storage and long-term cycling performance of lithium-ion NMC/graphite pouch cells prepared with a recently developed electrolyte additive, MDO, and two new additives, PDO and BS. Differential capacity versus voltage indicates that both MDO and PDO form passive SEI layers on the graphite electrode surface during cell formation, whereas BS does not. The reduction features are generally consistent with DFT-predicted values, although the presence of multiple reduction peaks requires additional study to rationalize. As individual additives, PDO-containing cells show the best performance although these are nonetheless out-performed by VC-containing cells.”