| 1 | Molecular grafting towards high-fraction active nanodots implanted in N-doped carbon for sodium dual-ion batteries显示文摘Sodium-based dual-ion batteries(Na-DIBs) show a promising potential for large-scale energy storage applications due to the merits of environmental friendliness and low cost.However,Na-DIBs are generally subject to poor rate capability and cycling stability for the lack of suitable anodes to accommodate large Na+ ions.Herein,we propose a molecular grafting strategy to in situ synthesize tin pyrophosphate nanodots implanted in N-doped carbon matrix(SnP_(2)O_(7)@N-C),which exhibits a high fraction of active SnP_(2)O_(7) up to 95.6 wt% and a low content of N-doped carbon(4.4 wt%) as the conductive framework.As a result,this anode delivers a high specific capacity400 mAh g^(-1) at 0.1 A g^(-1),excellent rate capability up to 5.0 A g^(-1) and excellent cycling stability with a capacity retention of 92% after 1200 cycles under a current density of1.5 A g^(-1).Further,pairing this anode with an environmentally friendly KS6 graphite cathode yields a SnP_(2)O_(7)@N-C||KS6 Na-DIB,exhibiting an excellent rate capability up to 30 C,good fast-charge/slow-discharge performance and long-term cycling life with a capacity retention of96% after 1000 cycles at 20 C.This study provides a feasible strategy to develop high-performance anodes with high-fraction active materials for Na-based energy storage applications. | Sainan Mu Qirong Liu Pinit Kidkhunthod Xiaolong Zhou Wenlou Wang Yongbing Tang | 2021 | National Science Review2021，8，7： | 1 |
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