Tesla has filed a new patent for improved battery chemistry, according to Electrek. The new international patent called ‘Dioxazolones and nitrile sulfites as electrolyte additives for lithium-ion batteries’ was filed through Tesla Motors Canada subsidiary.
Adjusting cell chemistry
The new technology is meant to work for both electric vehicles and grid-storage. It aims to improve Tesla's rechargeable battery systems by adjusting their cells’ chemistry.
"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," writes the patent's abstract.
Tesla owes a lot of its success to its impressive batteries. It is these batteries' unique cell chemistry that allows Tesla to maximize its vehicles’ battery packs.
These batteries are why a Model S can travel 600 kilometers on one charge with a 100 kWh battery. Therefore, it is wise and financially sound for Tesla to keep working on its batteries.
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. The additives were also tested in binary blends with VC, DTD, and LFO. In long-term cycling tests, cells prepared with 2%PDO/l%DTD and 2%PDO/l%LFO additive blends outperform VC-containing cells. However, the high-temperature storage behavior of 2%PDO/l%LFO is superior than that of the 2%PDO/l%DTD blend," wrote Tesla in its patent conclusion.
The patent application basically reveals that the new two-additive mixtures in an electrolyte solvent can be used with NMC battery chemistry, chemistry used in EVs by many carmakers except Tesla. Will this element create the long-lasting durable and cheaper battery Tesla has been working toward?