Lithium/fluorinated　carbon　(Li/CFx)　battery　possesses　ultra-high　energy　density,　yet　the　poor　conductivity　of　CFx　pose　certain　limitations　on　its　electrochemical　performance.　In　this　work,　a　CF1.05-SeS2　composite　material　with　both　high　energy　density　and　power　density　is　prepared.　The　abundant　pore　structure　of　CF1.05　provides　ample　space　for　the　loading　of　SeS2　and　numerous　reaction　sites　for　electrochemical　reactions.　During　70　%　of　the　discharge　depth　of　CFx,　SeS2　can　participate　the　discharge　reaction,　further　enhancing　its　discharge　performance.　The　CF1.05-SeS2　exhibits　excellent　electrochemical　performance,　with　maximum　energy　density　reaching　2534　Wh　kg-1　and　maximum　power　density　of　57,725　W　kg-　1　simultaneously.　Density　functional　theory　(DFT)　calculations　reveal　that　the　introduction　of　SeS2　can　reduce　the　Lithium-ion　diffusion　energy　barrier　and　increase　the　Lithium-ion　adsorption　energy.　This　work　provides　new　insights　into　modifying　CFx　materials　to　enhance　their　energy　density　and　power　density.