Necklace-like carbon nanofibers encapsulating MoO_(2) nanospheres with Mo-C bonding for stable lithium-ion storage

Molybdenum dioxide has aroused a wide concern as anode material for lithium-ion batteries(LIBs)due to its high theoretical capacity and high density.However,it still faces the problems of large volume changes and low electronic conductivities,which limits its practical application.Herein,necklace-like N-doped carbon nanofibers encapsulating MoO_(2)nanospheres(MoO_(2)@NCNFs)with Mo-C bonding have been designed to address these issues.The rational design carbon coating structure can not only enhance the electron transfer,but also markedly strengthen structural stability.As expected,the as-prepared electrode showed superior lithium storage capacity,including a high specific capacity of 1120 mAh·g^(-1)at 0.1 A·g^(-1),and good rate performance of 502 mAh·g^(-1)at 4.0 A·g^(-1)and a prolonged cycling stability of 490 mAh·g^(-1)capacity retention over 3000 cycles at 4.0 A·g^(-1).