An international team designed a low-cost, sustainable sodium-ion battery using a P2-type Na0.67Mn0.9Ni0.1O2 cathode and lavender-flower-waste-derived hard carbon anode. The system, intended for stationary energy storage, showed initial capacities of 200 mAh/g (cathode) and 360 mAh/g (anode) with 42% and 67.
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