Although it has been proven that porous,heteroatomic,and defective structures improve Na storage performance,they also severely affect the initial Coulombic efficiency(ICE)due to the huge irreversible capacity in the ...Although it has been proven that porous,heteroatomic,and defective structures improve Na storage performance,they also severely affect the initial Coulombic efficiency(ICE)due to the huge irreversible capacity in the first cycle,which always limits the practical application of carbon anodes in commercial Na-ion batteries(NIBs).Here,we show the successful synthesis of nanocrystalline cellulose and the derivative hard carbons.A series of treatments including acid hydrolysis,hydrothermal carbonization,and hightemperature pyrolysis help tune the pores,heteroatoms,and defects to achieve an optimized balance between superior ICE and reversible capacity of up to 90.4%and 314 mAh g^(−1).This study highlights that tailoring the electrode microstructure could be an important strategy in the future design of carbonaceous anode materials for high-performance Na-ion batteries.展开更多
基金Natural Science Foundation of Beijing Municipality,Grant/Award Number:2212022Science and Technology Facilities Council,Grant/Award Number:ST/R006873/1+3 种基金China Postdoctoral Science Foundation,Grant/Award Number:2021M693367National Natural Science Foundation of China,Grant/Award Numbers:51725206,51861165201,52072403,52122214Engineering and Physical Sciences Research Council,Grant/Award Numbers:EP/R021554/2,EP/S018204/2Chinese Academy of Sciences,Grant/Award Numbers:2020006,XDA21070500。
文摘Although it has been proven that porous,heteroatomic,and defective structures improve Na storage performance,they also severely affect the initial Coulombic efficiency(ICE)due to the huge irreversible capacity in the first cycle,which always limits the practical application of carbon anodes in commercial Na-ion batteries(NIBs).Here,we show the successful synthesis of nanocrystalline cellulose and the derivative hard carbons.A series of treatments including acid hydrolysis,hydrothermal carbonization,and hightemperature pyrolysis help tune the pores,heteroatoms,and defects to achieve an optimized balance between superior ICE and reversible capacity of up to 90.4%and 314 mAh g^(−1).This study highlights that tailoring the electrode microstructure could be an important strategy in the future design of carbonaceous anode materials for high-performance Na-ion batteries.
