2D　MXene-based　nanomaterials　have　attracted　tremendous　attention　because　of　their　unique　physical/chemical　properties　and　wide　range　of　applications　in　energy　storage,　catalysis,　electronics,　optoelectronics,　and　photonics.　However,　MXenes　and　their　derivatives　have　many　inherent　limitations　in　terms　of　energy　storage　applications.　In　order　to　further　improve　their　performance　for　practical　application,　the　nanoengineering　of　these　2D　materials　is　extensively　investigated.　In　this　Review,　the　latest　research　and　progress　on　2D　MXene-based　nanostructures　is　introduced　and　discussed,　focusing　on　their　preparation　methods,　properties,　and　applications　for　energy　storage　such　as　lithium-ion　batteries,　sodium-ion　batteries,　lithium-sulfur　batteries,　and　supercapacitors.　Finally,　the　critical　challenges　and　perspectives　required　to　be　addressed　for　the　future　development　of　these　2D　MXene-based　materials　for　energy　storage　applications　are　presented.