“…To solve these issues, some optimization strategies have been proposed and proved to be feasible, such as heteroatom-doping (N, S, P, and O, e.g. ), 18,23,[25][26][27] pore-structure engineering (micro-meso-macropores), 20,28,29 and stable solid electrolyte interphase (SEI) layer design. [30][31][32][33][34] To be specific, the introduction of heteroatoms into the carbon matrix not only can expand the interlayer spacing to accelerate K-ion diffusion and alleviate volume fluctuation, but induces more defect sites to adsorb potassium, 35 all of which are favorable for realizing excellent rate, cycling, and capacity.…”