This study presents the cellulose fiber doped ternary composite of different transition diselenides. The ternary composites were prepared via a hydrothermal-assisted physical blending route. The ternary composite of CoSe2-based symmetric cell provided higher electrochemical performance than the other ternary composites. The energy and power density provided by the same cell is around 144 W h kg-1 and 989 W kg-1 at 1 A g-1 for a 1.6 V. The stabilization of the CAC-5 material was investigated for 10,000 cycles at 2 A g-1. The real-time use of the CAC-5 symmetric cell was successfully verified via the illuminating 26-red LED panel for 1 h 40 min. Additionally, the schematic depiction of the charge storage mechanism connected with the CAC-5 symmetric cell during the charging/discharging process has been proposed in this work. The results highlight the potential of CAC-5 material for its application in the energy storage field.