Toward Highly Selective Heteroatom Dopants in Hard Carbon with Superior Lithium Storage Performance
Hard carbons(HCs)have gained much attention for next-generation high energy density lithium ion battery(LIB)anode candidates.However,voltage hysteresis,low-rate capability,and large initial irreversible capacity severely affect their wide application.Here in the paper,a general strategy is reported to fabricate nitrogen atom(N)-doped HC anodes with superb rate capability and cyclic stability based on a three-dimensional(3D)framework and a hierarchical porous structure.The obtained N-doped hard carbon(NHC)exhibits an excellent rate capability of 315 mAh/g at 10.0 A/g and a long-term cyclic stability of 90.3％capacity retention after 1 000 cycles at 3 A/g.Moreover,the as-constructed pouch cell delivers a high energy density of 483.8 Wh/kg and fast charging capability.The versatile strategy in this work opens an avenue for the rational design of advanced carbonaceous materials with high performance for LIB applications.
hard carbonnitrogen dopinganodelithium ion batteries
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