Figure 9.
(a) Crystal structure of Na4FeV(PO4)3. (b) 23Na magic-angle-spinning (MAS) NMR of NFVP@C at different cycle states. Reproduced with permission from ref (99). Copyright 2022 Elsevier. (c) Cycling performance of NFVP/C with varying Zr-content (0–0.2). (d) Variation of the lattice parameters of NFVP/C and NFVZ0.1P/C electrodes. Reproduced with permission from ref (101). Copyright 2022 Elsevier.