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Abstract Black phosphorus (BP) has been recognized as an ideal anode material for fast‐charging lithium (Li)‐ion capacitors (LICs) due to its high theoretical capacity (2596 mAh g −1 ), appropriate lithiation potential (0.7 V vs Li + /Li) and fast ion diffusion capability. However, large volume change and soluble polyphosphides (Li x Ps)‐based intermediates during charging‐discharging process seriously deteriorate cycling performance. To address the aforementioned issues, an elaborated design is reported on the binder for BP electrode. The ‐NH 2 polar functional group in grafted chitosan (GCS) binder presents strong chemical anchoring effect for both BP and soluble Li x Ps, achieving superior adhesion force and Li x Ps constraining capability for enhanced structure integrity of BP electrode. In addition, GCS exhibits strong Li‐ion binding energy that promotes the Li‐ion adsorption at electrode level, leading to a boosted cycle life for BP. As a result, the graphene (G) incorporated BP electrode using GCS binder shows specific capacity of 997.6 mAh g −1 after 400 cycles at 1 A g −1 . This study unravels the crucial role of functional groups for binder in high‐performance BP electrode.
Liu et al. (Mon,) studied this question.