The　electrochemistry　of　cathode　materials　for　sodium-ion　batteries　differs　significantly　from　lithium-ion　batteries　and　offers　distinct　advantages.　Overall,　the　progress　of　commercializing　sodium-ion　batteries　is　currently　impeded　by　the　inherent　inefficiencies　exhibited　by　these　cathode　materials,　which　include　insufficient　conductivity,　slow　kinetics,　and　substantial　volume　changes　throughout　the　process　of　intercalation　and　deintercalation　cycles.　Consequently,　numerous　methodologies　have　been　utilized　to　tackle　these　challenges,　encompassing　structural　modulation,　surface　modification,　and　elemental　doping.　This　paper　aims　to　highlight　fundamental　principles　and　strategies　for　the　development　of　sodium　transition　metal　oxide　cathodes.　Specifically,　it　emphasizes　the　role　of　various　elemental　doping　techniques　in　initiating　anionic　redox　reactions,　improving　cathode　stability,　and　enhancing　the　operational　voltage　of　these　cathodes,　aiming　to　provide　readers　with　novel　perspectives　on　the　design　of　sodium　metal　oxide　cathodes　through　the　doping　approach,　as　well　as　address　the　current　obstacles　that　can　be　overcome/alleviated　through　these　dopant　strategies.