Transition　metal　oxides　hold　great　promise　for　lithium-ion　batteries　(LIBs)　and　electrocatalytic　water　splitting　because　of　their　high　abundance　and　high　energy　density.　However,　designing　and　fabrication　of　efficient,　stable,　high　power　density　electrode　materials　are　challenging.　Herein,　we　report　rambutan-like　hollow　carbon　spheres　formed　by　carbon　nanosheet　decorated　with　nickel　oxide　(NiO)　rich　in　metal　vacancies　(denoted　as　h-NiO/C)　as　a　bifunctional　electrode　material　for　LIBs　and　electrocatalytic　oxygen　evolution　reaction　(OER).　When　being　used　as　the　anode　of　LIBs,　the　h-NiO/C　electrode　shows　a　large　initial　capacity　of　885mAhg(-1),　a　robust　stability　with　a　high　capacity　of　817mAhg(-1)　after　400　cycles,　and　great　rate　capability　with　a　high　reversible　capacity　of　523mAhg(-1)　at　10Ag(-1)　after　600　cycles.　Moreover,　working　as　an　OER　electrocatalyst,　the　h-NiO/C　electrode　shows　a　small　overpotential　of　260mV　at　10mAcm(-2),　a　Tafel　slope　of　37.6mVdec(-1)　along　with　good　stability.　Our　work　offers　a　cost-effective　method　for　the　fabrication　of　efficient　electrode　for　LIBs　and　OER.