Vanadium sulfide decorated at carbon matrix as anode materials for “fast-charging” lithium-ion batteries

Vanadium sulfide is considered a promising electrode material for achieving rapid lithium storage ascribing to its high specific capacity, unique crystal structure, and abundant valence states. Unfortunately, the structural collapse induced by volume expansion during charging and discharging is the key factor affecting rapid lithium storage. This article prepares composite materials with different morphologies through a strategy of decorating vanadium sulfide at carbon matrix. Among them, graphene oxide modified vanadium tetrasulfide composite materials with three-dimensional conductive networks exhibit excellent electrochemical performance . When the current density is 50 mA g −1 , the discharging specific capacity reaches 1, 560 mAh g −1 . After 2, 500 cycles at a high current density of 10, 000 mA g −1 , the specific capacity is about 188 mAh g −1 with charging time of approximately 70 s. GITT testing indicates that the order of magnitude of the logarithm of the initial diffusion coefficient is 10 −11 cm 2 s −1 owing to the three-dimensional porous conductive network, which not only shortens ion diffusion path but also provides more active sites for lithium-ion storage, rendering it a promising anode material for “fast-charging” lithium-ion batteries.