Manganese oxide(Mn_(3)O_(4))is of great potential for lithium storage based on conversion reactions,but its application in rechargeable lithium batteries is severely hindered by the low electric conductivity and large...Manganese oxide(Mn_(3)O_(4))is of great potential for lithium storage based on conversion reactions,but its application in rechargeable lithium batteries is severely hindered by the low electric conductivity and large volume variation during lithiation/delithiation.Herein,a biomimetic ear-of-wheat-like nanocomposite of ultrafine Mn_(3)O_(4)nanoparticles(MONPs)and multi-walled carbon nanotubes(MWCNTs)is prepared using a facile solvothermal method.The tightly packed MONP"cereal-grains"are directly grown and uniformly interspersed on the outer surface of skeleton MWCNT"central stems."The ultrafine MONPs are favorable to lithium incorporation/extraction while the interconnected MWCNT skeletons provide a highly conducting network for electron transportation.Consequently,a high reversible capacity of 810 m A h g^(-1)is obtained at the current density of 40 m A g^(-1).After 50 cycles at 160 m A g^(-1),the nanocomposite still delivers a capacity up to 796 m A h g^(-1),which is higher than twice of that of pure Mn_(3)O_(4)nanopowders.The unique nanostructure and the facile biomimetic method can be widely extended to design and explore various highperformance energy materials for lithium/sodium ion batteries and fuel cells.展开更多
基金financially supported by the National Natural Science Foundation of China(Grant No.51772240,51671154,21503158)the Key Research and Development Plan of Shaanxi Province(China,Grant No.2018ZDXM-GY-135)+1 种基金the National Key Research and Development Program of China(Grant No.2016YFB0700404)the Natural Science Foundation of Shaanxi Province(China,Grant No.2014JQ2-2007)
文摘Manganese oxide(Mn_(3)O_(4))is of great potential for lithium storage based on conversion reactions,but its application in rechargeable lithium batteries is severely hindered by the low electric conductivity and large volume variation during lithiation/delithiation.Herein,a biomimetic ear-of-wheat-like nanocomposite of ultrafine Mn_(3)O_(4)nanoparticles(MONPs)and multi-walled carbon nanotubes(MWCNTs)is prepared using a facile solvothermal method.The tightly packed MONP"cereal-grains"are directly grown and uniformly interspersed on the outer surface of skeleton MWCNT"central stems."The ultrafine MONPs are favorable to lithium incorporation/extraction while the interconnected MWCNT skeletons provide a highly conducting network for electron transportation.Consequently,a high reversible capacity of 810 m A h g^(-1)is obtained at the current density of 40 m A g^(-1).After 50 cycles at 160 m A g^(-1),the nanocomposite still delivers a capacity up to 796 m A h g^(-1),which is higher than twice of that of pure Mn_(3)O_(4)nanopowders.The unique nanostructure and the facile biomimetic method can be widely extended to design and explore various highperformance energy materials for lithium/sodium ion batteries and fuel cells.
