Building a Long-Lifespan Aqueous K-Ion Battery Operating at −35 °C
As a result, the full cell delivers high energy density (56.3 Wh kg –1 at 25 °C, 41.9 Wh kg –1 at −35 °C) and a long low-temperature lifespan (87.5% capacity retention over 1000 cycles at −35
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