Tin Anode – New U.S. Battery Breakthrough That Could Change Everything. A group of US researchers just broke the energy-density ceiling on sodium-ion batteries– and they did it with an anode that is 99.5 % plain tin.
In full pouch cells, the new tin-anode design hits 178 Wh/kg and 417 Wh/L, numbers that beat every commercial LFP pack on the roadway today (Tesla, BYD, everybody). For the very first time, sodium-ion now surpasses lithium-iron-phosphate while using none of the scarce metals China controls.
The trick is nearly comically simple: mix tin powder with 0.5 % carbon nanotubes and binder. Throughout the first cycles the tin fractures, then spontaneously re-welds into a permeable, interconnected sponge that stops additional swelling and keeps cycling stable. Early cells hold ~ 90 % capacity after 100 cycles– already fixable with much better electrolytes.
Sodium is dirt-cheap and plentiful, the batteries work much better in severe cold, and cycle life could reach 5,000+. Tin adds cost ($ 35– 40/kg), but far less than cobalt or nickel, and supply originates from friendly nations.
Unigrid Battery, the United States start-up behind it, can license this tomorrow and develop factories at home. For the very first time in 15 years, America has a reasonable shot at an enormous, independent battery market.
Lithium's age might be ending faster than anybody predicted.
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