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<正>Hard carbon(HC)is one of the most promising anode materials for sodium-ion batteries(SIBs)due to its suitable potential and high reversible capacity.At the same time,the correlation between carbon local structure and sodium-ion storage behavior is not clearly understood.The two series of HC materials with perfect spherical morphology and tailored microstructures were designed and successfully produced using resorcinol formaldehyde(RF)resin as precursor.Based on the microstructures,unique electrochemical characteristics,and atomic pair