Construction of the hierarchical porous biochar with an ultrahigh specific surface area for application in high-performance lithium-ion capacitor cathode
Haotian Zhu, Jiayuan Li, Dichao Wu, Gaoyue Zhang, YunJuan Sun, Ao Wang, Kang Sun
Biochar ›› 2023, Vol. 5 ›› Issue (1) : 0.
Construction of the hierarchical porous biochar with an ultrahigh specific surface area for application in high-performance lithium-ion capacitor cathode
| • | Novel multi-stage combination activation for constructing high-performance biochar cathode |
| • | An ultrahigh specific surface area and a hierarchical porous structure were constructed in the complex biochar-derived precursor simultaneously |
| • | Providing some insights or data backups for the large-scale production of multi-step activation for biochar. |
Biochar with a highly accessible specific surface area can display a higher performance when it is used as the cathode of lithium-ion capacitors. Facing the complex composition and diversity of biomass precursors, there is a lack of a universally applicable method to construct hierarchical porous biochar controllably. In this work, a multi-stage activation strategy combining the feature of different activation methods is proposed for this target. To confirm the porous characteristic in prepared samples, N2 adsorption–desorption and transmission electron microscope were used. As the optimal sample, BC-P3K4S had the highest specific surface area of 3583.3 m2 g−1. Evaluated as the electrode for a lithium-ion capacitor, BC-P3K4S displayed a capacity of 139.1 mAh g−1 at 0.1 A g−1. After coupling it with pre-lithiated hard carbon, the full device exhibited a high energy density of 129.3 W h kg−1 at 153 W kg−1. The work outlined herein offers some insights into the preparation of hierarchical porous biochar from complex biomass by multistep activation method.
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