Transition　metal　sulfides　are　regarded　as　a　category　of　promising　electrodes　for　alkaline　ion　batteries　because　of　their　high　theoretical　capacities,　fast　ionic　conductivity　and　low　cost,　but　they　also　face　many　challenges　on　large　volume　changes,　sluggish　kinetics　and　instability　of　solid　electrolyte　interphase　(SEI).　To　tackle　these　issues,　this　work　designs　iron　sulfide/molybdenum　disulfide　(FeS　/　MoS2)　yolk-shell　sphere　electrodes　coated　by　few-nanometer　thick　alumina　film.　Such　alumina　film　is　adopted　to　minimize　side　reactions,　promote　the　formation　of　stable　SEI,　and　enhance　the　mechanical　stability　of　the　electrode.　Specifically,　when　used　as　anode　materials　at　100　mA　g(-1)　in　Li/Na/K-ion　batteries,　the　coated　electrode　(ALD-40-E)　can　deliver　reversible　capacities　of　1007,　570　and　367　mAh　g(-1)　after　100　cycles,　respectively,　which　are　substantially　larger　than　those　of　bare　FeS　/　MoS2　electrode　(ALD-0-E:　538,　311　and　213　mAh　g(-1))　and　FeS　/　MoS2　with　direct　alumina　coating　on　powder　surface　(ALD-40-P:　429,　116　and　86　mAh　g(-1)).　Good　electrochemical　properties　are　mainly　ascribed　to　the　yolk-shell　structure,　and　the　alumina　thin　film　on　the　electrode,　which　work　synergistically　to　maintain　the　electrical　contact,　facilitate　the　ion/electron　diffusion　paths,　accommodate　volume　change　and　preserve　structural　stability.　(C)　2021　Published　by　Elsevier　Ltd.