| High-performance lithium-ion batteries?LIBs?require electrode material to have an ideal electrode construction which provides fast ion transport,short solid-state ion diffusion,large surface area,and high electric conductivity.The microstructure of electrode materials determines the comprehensive performance of lithium ion batteries.Herein,highly porous three-dimensional?3D?aerogels composed of mixed transition metal oxides?MTMOs?nanoparticles?NPs?and carbon nanotubes?CNTs?are prepared usingsustainable alginate as the precursor.The key feature of this work is that by using the characteristic egg-box structure of the alginate,metal cations can be easily chelated via an ion-exchange process,thus binary MTMOs are expected to be prepared.In the hybrid aerogels,MTMOs NPs interconnected by the CNTs are embedded in carbon aerogel matrix,forming the 3D network which can provide high surface area,buffer the volume expansion and offer efficient ion and electron transport pathways for achieving high performance LIBs.Compared with traditional MTMOs/C materials,the MTMOs/CNT aerogels prepared by this workachievedsuperior electrochemical properties,which possessreversible capacity upto1033 mA h g-1 at 0.1 A g-1 and a high specific capacity of 874 mAh g-1 after 160 cycles at 1A g-1.Meanwhile,ZCO/CNT and ZFO/CNT aerogelsachievedreversible capacities of 922 mA h g-1 and 750 mA h g-1at 0.1 A g-1,specific capacities of 829 mAh g-1and 698 mAh g-1after 300 cycles at 1A g-1,respectively.Results indicated that their excellent electrochemical performance is attributed to the synergistic effect of MTMOs NPs,CNTs and carbon aerogels.In other words,MTMOs NPs and CNTs embedded in carbon aerogels matrix formed a 3D network structure,whichwas beneficial for the electrochemical performance.In brief,this work provide a highefficiency,environmentallyfriendlyand inexpensive strategy for the scale-up production of MTMOs/CNT anode materials for high performanceLIBs. |
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