Aqueous Mg-ion batteries(AMIBs)featuring advantages of good safety,low cost,and high specific energy have been recognized as a promising energy-storage technology.However,the performance of AMIBs is consistently limit...Aqueous Mg-ion batteries(AMIBs)featuring advantages of good safety,low cost,and high specific energy have been recognized as a promising energy-storage technology.However,the performance of AMIBs is consistently limited by sluggish diffusion kinetics and structural degradation of cathode materials arising from the strong electrostatic interactions between high-charge-density Mg2+and host materials.Here,layered-structured NiOOH,as traditional cathodes for alkaline batteries,is initially demonstrated to realize proton-assisted Mg-(de)intercalation chemistry with a high discharge platform(0.57V)in neutral aqueous electrolytes.Benefiting from the unique core/shell structure,the resulting NiOOH/CNT cathodes achieve a high capacity of 122.5 mAh g−1 and long cycle stability.Further theoretical calculations reveal that the binding energy of hydrated Mg2+is higher than that of Mg2+with NiOOH,resulting in that Mg2+is easily intercalated/de-intercalated into/from NiOOH.Benefiting from the freestanding design,the assembled fiber-shaped“rocking-chair”NaTi2(PO4)3//NiOOH AMIB shows a high energy density and satisfactory mechanical flexibility,which could be woven into a commercial fabric and power for fiber-shaped photoelectric sensors.展开更多
基金This work was supported by the Singapore Ministry of Education Academic Research Fund Tier 2(MOE2019-T2-2-127 and MOE-T2EP50120-0002)supported by the National Key R&D Program of China(2022YFA1203304)+10 种基金the Natural Science Foundation of Jiangsu Province(BK20220288)the Singapore Ministry of Education Academic Research Fund Tier 1(RG62/22)A*STAR under AME IRG(A2083c0062)This work was supported by A*STAR under its IAF-ICP Programme I2001E0067the Schaeffler Hub for Advanced Research at NTU.This work was also supported by NTU-PSL Joint Lab collaboration.We are grateful for the technical support of 2D GIWAXS for Nano-X from Suzhou Institute of Nano-Tech and Nano-Bionics,Chinese Academy of Sciences.This work was supported by the Singapore Ministry of Education Academic Research Fund Tier 2(MOE2019-T2-2-127 and MOE-T2EP50120-0002)supported by the National Key R&D Program of China(2022YFA1203304)the Natural Science Foundation of Jiangsu Province(BK20220288)the Singapore Ministry of Education Academic Research Fund Tier 1(RG62/22)A*STAR under AME IRG(A2083c0062)This work was supported by A*STAR under its IAF-ICP Programme I2001E0067the Schaeffler Hub for Advanced Research at NTU.This work was also supported by NTU-PSL Joint Lab collaboration.We are grateful for the technical support of 2D GIWAXS for Nano-X from Suzhou Institute of Nano-Tech and Nano-Bionics,Chinese Academy of Sciences.
文摘Aqueous Mg-ion batteries(AMIBs)featuring advantages of good safety,low cost,and high specific energy have been recognized as a promising energy-storage technology.However,the performance of AMIBs is consistently limited by sluggish diffusion kinetics and structural degradation of cathode materials arising from the strong electrostatic interactions between high-charge-density Mg2+and host materials.Here,layered-structured NiOOH,as traditional cathodes for alkaline batteries,is initially demonstrated to realize proton-assisted Mg-(de)intercalation chemistry with a high discharge platform(0.57V)in neutral aqueous electrolytes.Benefiting from the unique core/shell structure,the resulting NiOOH/CNT cathodes achieve a high capacity of 122.5 mAh g−1 and long cycle stability.Further theoretical calculations reveal that the binding energy of hydrated Mg2+is higher than that of Mg2+with NiOOH,resulting in that Mg2+is easily intercalated/de-intercalated into/from NiOOH.Benefiting from the freestanding design,the assembled fiber-shaped“rocking-chair”NaTi2(PO4)3//NiOOH AMIB shows a high energy density and satisfactory mechanical flexibility,which could be woven into a commercial fabric and power for fiber-shaped photoelectric sensors.
