Lithium-Ion: Electrolyte

Strong Lewis-Acid Coordinated PEO Electrolyte Achieves Over 580 Wh/kg In 4.8 VClass All-Solid-State Batteries

Polyethylene oxide PEObased electrolytes are one of the go-to materials for solid-state batteries, but typically have poor oxidation resistance at high voltages, limiting energy density.

The introduction of Mg2+ and Al3+ ions improves cyclic stability by weakening electron density in ether oxygen chains, reducing undesirable interactions with cathodes. The authors used Lewis-acid coordinated electrolytes and Ni-rich cathodes to achieve high-voltage stability at 4.8 V over 300 cycles. Further, the demonstration of industrial-scale electrolyte membrane, and Ah-level pouch cells over 586 Wh kg, including one with good cycling stability, suggests the potential for practical applications in all-solid-state batteries.

Source: An et al, Nature Comm., 2024

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