fig14

Figure 14. (A) Schematic illustration of the (de-)Potassiation process of red P particles, hollow carbon fibers coated with red P, and nanostructured red P confined in the N-PHCNF matrix in KIBs. (B) In-situ XRD patterns of the red P/N-HCNFs-5 composite when discharged to 0.01 V. Copyright 2019, Nano Letters^[92]. (C) P/C electrodes in KIBs at different potentials. Copyright 2017, Journal of the American Chemical Society^[159]. (D) Formation energies of possible phase during potassiation for BP. Copyright 2019, Electronic Materials Letters^[160].