Metal sulfides with high theoretical capacities are expected as promising cathode materials of Al batteries(AIBs).However,powdery active materials are mainly synthesized and loaded on current collector by insulating binder without capacity.Meanwhile,S as inert element in metal sulfides can not usually pro-vide capacity.So,powdery metal sulfides only exhibit limiting practical capacity and poor cycling stabil-ity due to weak conductivity and low mass utilization.Herein,the novel self-supporting and dual-active Co-S nanosheets on carbon cloth(i.e.Co-S/CC)with hierarchically porous structure are constructed as cathode of AIBs.Co-S nanosheets are derived from ZIF-67 nanosheets on CC by a facile ligand replacement reaction.As a result,the binder-free Co-S/CC cathode with good conductivity delivers excellent initial dis-charge capacity of 383.4 mAh g-1(0.211 mAh cm-2)at current density of 200 mA g-1 and maintain rever-sible capacity of 156.9 mAh g-1(0.086 mAh cm-2)with Coulombic efficiency of 95.8％after 500 cycles,which are much higher than those of the traditional slurry-coating cathodes.Both Co and S as active ele-ments in Co-S/CC contribute to capacity,which leads to a high mass utilization.This work provides a sig-nificant strategy for the construction of self-supporting metallic cathode for advanced high-energy density Al battery.

Aijing Lv;Songle Lu;Mingyong Wang;Haotian Shi;Wenjing Yan;Shuqiang Jiao

State Key Laboratory of Advanced Metallurgy,University of Science and Technology,Beijing,Beijing 100083,China;National Center for Materials Service Safety,University of Science and Technology Beijing,Beijing 100083,China;Beijing Key Laboratory of Green Recovery and Extraction of Rare and Precious Metals,University of Science and Technology,Beijing,Beijing 100083,China

能源化学

[1]Aijing Lv;Songle Lu;Mingyong Wang;Haotian Shi;Wenjing Yan;Shuqiang Jiao-.Self-supporting and dual-active 3D Co-S nanosheets constructed by ligand replacement reaction from MOF for rechargeable Al battery)[J].能源化学,2022(06):35-43

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