High-performance K-ion Half/full Batteries with Superb Rate Capability and Cycle Stability
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SignificanceThe present work might be significant for exploring advanced K-ion batteries with superb rate capability and cycle stability toward practical applications. The as-assembled K-ion half cell exhibits an excellent rate capability of 428 mA h g at 100 mA g and a high reversible specific capacity of 330 mA h g with 120% specific capacity retention after 2,000 cycles at 2,000 mA g, which is the best among those based on carbon materials. The as-constructed full cell delivers 98% specific capacity retention over 750 cycles at 500 mA g, superior to most of those based on carbon materials that have been reported thus far.
Ampere-hour-scale soft-package potassium-ion hybrid capacitors enabling 6-minute fast-charging.
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