Carbon-coated nano-bismuth as high-rate sodium anode material
Bismuth has emerged as a promising anode material for sodium-ion batteries,attracting attention due to its superior ion kinetics and extended cycle life.Bismuth-based materials exhibit significant potential for enhancing energy density and charge-discharge efficiency.However,their application faces challenges due to volume expansion and the stability of the solid electrolyte interphase.These issues necessitate the development of improvements in electrical conductivity and structural stability through nanostructure design,interface engineering,and carbon coating techniques.In this study,we synthesized carbon-coated bismuth nanomaterial using a one-step carbonization method,employing a metal-organic framework of bismuth as the precursor.The bismuth particles were securely anchored to the graphene surface via C-O-Bi interfacial interactions,displaying exceptional capacity retention and stable cycling performance at high current densities.The sodium-ion storage process,dominated by pseudocapacitance,facilitates the formation of a stable solid electrolyte interphase film and enhances ion diffusion,thus improving the cycle stability and charge-discharge efficiency of the battery.The robust chemical bonds at the bismuth-graphene interfaces help maintain the structural integrity of the metal particles,buffer against volume expansion,and expedite electron diffusion,thereby boosting the electrochemical activity of the material.These findings not only provide an effective method for enhancing anode materials for batteries but also offer a new perspective for the understanding and optimization of anode materials,with significant implications for the design and development of high-performance sodium-ion battery anodes.
sodium ion batteryanodemetal-organic skeletoncarbon coatingbismuth-based material
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