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TeslaPatent applicationBatteries & energyInterest 4/10

Tesla patents new chemical mix to improve battery electrolytes

Patent drawing
Patent drawing from the official filing.

Tesla describes a specific chemical mixture for the liquid inside batteries, known as the electrolyte. The filing details using small amounts of sodium difluorophosphate combined with other similar compounds to help the battery function.

Why it mattersThis is a standard improvement to battery chemistry that could help make electric vehicle batteries more stable or efficient over time.

In the filing’s own words

The present disclosure relates to the synthesis and evaluation of difluorophosphate additives for use in energy storage devices. The difluorophosphate additive may be selected from the group consisting of lithium difluorophosphate (LFO), sodium difluorophosphate (NaFO), ammonium difluorophosphate (AFO), tetramethylammonium difluorophosphate (MAFO), potassium difluorophosphate (KFO), and combinations thereof. In some instances, the difluorophosphate additive is not lithium difluorophosphate (LFO).

What exactly they claim (claim 1)

1. An electrolyte for an energy storage device, comprising: a lithium salt; a solvent; and an additive consisting essentially of sodium difluorophosphate (NaFO) and at least one additional difluorophosphate additive selected from the group consisting of lithium difluorophosphate (LFO), ammonium difluorophosphate (AFO), tetramethylammonium difluorophosphate (MAFO), potassium difluorophosphate (KFO), and combinations thereof, wherein the electrolyte comprises 0.1 wt. % to 5 wt. % of NaFO, and 0.1 wt. % to 5 wt. % of the additional difluorophosphate additive.

Facts

Company
Tesla (Tesla, Inc.)
Official title
DIFLUOROPHOSPHATE ADDITIVE COMPOUNDS AND METHODS THEREOF FOR USE IN ENERGY STORAGE DEVICES
Publication number
US20260302354A1
Application number
19695657
Filed
Jun 2, 2026
Published
Oct 1, 2026
Inventors
4
Claims
25

Classified under

H01M 10/0567 Electricity & electronicsH01M 4/364 Electricity & electronicsH01M 4/386 Electricity & electronicsH01M 4/583 Electricity & electronicsH01M 10/0525 Electricity & electronicsH01M 10/0568 Electricity & electronics
Read the full filing (official PDF) ↗ Open in the Patent Tracker

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Summaries are simplified from the filing’s own abstract and first claim. A patent filing is not a product announcement.
Patent data and drawings: U.S. Patent and Trademark Office (USPTO). Nebula is not affiliated with or endorsed by the USPTO.