Fast charging of energy-dense lithium-ion batteries | Nature

Questo potrebbe essere molto rilevante

Dei ricercatori hanno scoperto un modo di riscaldare un pò le batterie, cosa che le fa caricare più velocemente. Se però si scaldano troppo, si danneggiano. La parte difficile quindi è tenerle alla temperatura ottimale.

Loro hanno usato un foglio di nichel di pochi micrometri di spessore posto tra gli elettrodi  di ciascuna cella che, quando percorso da una corrente, scalda la cella a circa 65 gradi.

Sono riusciti a caricare una  batteria di 265 Wh/Kg al 70% in 11 minuti e a fare 2000 cicli di carica.

Source: Nature

Lithium-ion batteries with nickel-rich layered oxide cathodes and graphite anodes have reached specific energies of 250–300 Wh kg−1 (refs. 1,2), and it is now possible to build a 90 kWh electric vehicle (EV) pack with a 300-mile cruise range. Unfortunately, using such massive batteries to alleviate range anxiety is ineffective for mainstream EV adoption owing to the limited raw resource supply and prohibitively high cost. Ten-minute fast charging enables downsizing of EV batteries for both affordability and sustainability, without causing range anxiety. However, fast charging of energy-dense batteries (more than 250 Wh kg−1 or higher than 4 mAh cm−2) remains a great challenge3,4. Here we combine a material-agnostic approach based on asymmetric temperature modulation with a thermally stable dual-salt electrolyte to achieve charging of a 265 Wh kg−1 battery to 75% (or 70%) state of charge in 12 (or 11) minutes for more than 900 (or 2,000) cycles. This is equivalent to a half million mile range in which every charge is a fast charge. Further, we build a digital twin of such a battery pack to assess its cooling and safety and demonstrate that thermally modulated 4C charging only requires air convection. This offers a compact and intrinsically safe route to cell-to-pack development. The rapid thermal modulation method to yield highly active electrochemical interfaces only during fast charging has important potential to realize both stability and fast charging of next-generation materials, including anodes like silicon and lithium metal.

Continua qui: Fast charging of energy-dense lithium-ion batteries | Nature

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