Electrochemical　energy　devices　serve　as　a　vital　link　in　the　mutual　conversion　between　chemical　energy　and　electrical　energy.　This　role　positions　them　to　be　essential　for　achieving　high-efficiency　utilization　and　advancement　of　renewable　energy.　Electrochemical　reactions,　including　anodic　and　cathodic　reactions,　play　a　crucial　role　in　facilitating　the　connection　between　two　types　of　charge　carriers:　electrons　circulating　within　the　external　circuit　and　ions　transportation　within　the　internal　electrolyte,　which　ensures　the　completion　of　the　circuit　in　electrochemical　devices.　While　electrons　are　uniform,　ions　come　in　various　types,　we　herein　propose　the　concept　of　hybrid　electrochemical　energy　technologies　(h-EETs)　characterized　by　the　utilization　of　different　ions　as　charge　carriers　of　anodic　and　cathodic　reactions.　Accordingly,　this　review　aims　to　explore　the　fundamentals　of　emerging　hybrid　electrochemical　energy　technologies　and　recent　research　advancements.　We　start　with　the　introduction　of　the　concept　and　foundational　aspects　of　h-EETs,　including　the　proposed　definition,　the　historical　background,　operational　principles,　device　configurations,　and　the　underlying　principles　governing　these　configurations　of　the　h-EETs.　We　then　discuss　how　the　integration　of　hybrid　charge　carriers　influences　the　performance　of　associated　h-EETs,　to　facilitate　an　insightful　understanding　on　how　ions　carriers　can　be　beneficial　and　effectively　implemented　into　electrochemical　energy　devices.　Furthermore,　a　special　emphasis　is　placed　on　offering　an　overview　of　the　research　progress　in　emerging　h-EETs　over　recent　years,　including　hybrid　battery　capacitors　that　extend　beyond　traditional　hybrid　supercapacitors,　as　well　as　exploration　into　hybrid　fuel　cells　and　hybrid　electrolytic　synthesis.　Finally,　we　highlight　the　major　challenges　and　provide　anticipatory　insights　into　the　future　perspectives　of　developing　high-performance　h-EETs　devices.　©　2024　Science　China　Press