Ramadhan, N. 2026. Electrochemical performance of Na2MnPO4F/C cathode synthesized through a solid-state method with variation of carbon concentration between citric acid and coconut shell charcoal. Journal of Innovation Materials, Energy, and Sustainable Engineering. 4, 1 (Jul. 2026). DOI:https://doi.org/10.61511/jimese.v4i1.2026.2692.