Research progress on the influence of pore structure on hard carbon sodium storage performance
With its unique structural characteristics,hard carbon is considered to be the most promising negative electrode material to promote the industrialization of sodium-ion batteries.In addition to its layer spacing and chemical composition,the sodium storage performance of hard carbon is also closely related to nano pores.Hard carbon with ultra-micro pores,large pore volume,low specific surface area and closed pores can reduce the in-fluence of solid electrolyte interface film on sodium storage and facilitate the embedding/removal of sodium i-ons.Design and regulation of hard carbon pore structure has become one of the key points to improve the per-formance of sodium-ion batteries.The pore structure can be effectively controlled by selecting suitable precursor materials,adjusting pyrolysis process parameters(heating rate,pyrolysis temperature),improving pretreat-ment methods(physical activation,chemical activation),doping heteroatoms,coating and other means.It will be the development direction of sodium-ion batteries in the future to use advanced characterization methods combined with theoretical calculation to realize reasonable design of pore structure of hard carbon materials and prepare low cost,high capacity and high cycle stability negative electrode materials.
Hard carbonpore structureregulationenergy storagesodium ion battery
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