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Energy storage is an integral part of the modern world. One of the newest and most interesting concepts is the internal hybridization achieved in metal-ion capacitors. In this study, for the first time we used sodium borohydride (NaBH 4 ) as a sacrificial material for the preparation of next-generation sodium-ion capacitors (NICs). NaBH 4  is a material with large irreversible capacity of ca. 700 mA h g −1  at very low extraction potential close to 2.4 vs Na + /Na 0 . An assembled NIC cell with the composite-positive electrode (activated carbon/NaBH 4 ) and hard carbon as the negative one operates in the voltage range from 2.2 to 3.8 V for 5,000 cycles and retains 92% of its initial capacitance. The presented NIC has good efficiency &gt;98% and energy density of ca. 18 W h kg −1  at power 2 kW kg −1  which is more than the energy (7 W h kg −1  at 2 kW kg −1 ) of an electrical double-layer capacitor (EDLC) operating at voltage 2.7 V with the equivalent components as in NIC. Tin phosphide (Sn 4 P 3 ) as a negative electrode allowed the reaching of higher values of the specific energy density 33 W h kg −1  (ca. four times higher than EDLC) at the power density of 2 kW kg −1 , with only 1% of capacity loss upon 5,000 cycles and efficiency &gt;99%.

Sodium borohydride (NaBH 4 ) as a high-capacity material for next-generation sodium-ion capacitors