We report the microstructure, application for lithium-ion batteries of mesoporous Co304 prepared by modified KIT-6 template method. The sample was characterized by XRD, TEM, HRTEM and nitrogen adsorption. Their electr...We report the microstructure, application for lithium-ion batteries of mesoporous Co304 prepared by modified KIT-6 template method. The sample was characterized by XRD, TEM, HRTEM and nitrogen adsorption. Their electrochemical behaviors as electrode reactants for lithium ion batteries were evaluated by cyclic voltammograms and static charge-discharge. A direct comparison of electrochemical behaviors between mesoporous nanostructure and bulk reflects interesting ＂nanostructure effect＂, which is reasonably discussed in terms of how the 3D nanostructures of Co3O4 materials function in tuning their electrochemistry. The results demonstrate that further improvement of electrochemical performance in transition metal-oxide-based anode materials can be realized via the design of multiporous nanostructured materials.展开更多
Comprehensive Summary Room-temperature sodium-sulfur(RT-Na/S)batteries display attractive potential in large-scale energy-storage,but their practical application was still restricted by the serious dissolution of poly...Comprehensive Summary Room-temperature sodium-sulfur(RT-Na/S)batteries display attractive potential in large-scale energy-storage,but their practical application was still restricted by the serious dissolution of polysulfides.Herein,supported by the constructing of interface engineering,the metal sulfide-carbon nanocomposite can be prepared with considerable electrochemical properties.Utilizing the double-helix structure of carrageenan-metal hydrogels as precursors,in-situ metal sulfide(MxSy)nanostructure/3D carbon aerogels(3D CAs)can be successfully constructed.Importantly,with the assistance of the vulcanization process,3D carbon architecture was maintained in the composites and acted as a skeleton to optimize their structural stability.As the cathode of RT-Na/S batteries,ZnS/S@C and NiS_(2)/S@C delivered an excellent cycling stability and rate performance(179.8 mAh·g^(−1)at 20 A·g^(−1)after 10000 cycling for ZnS/S@C,220.3 mAh·g^(−1)at 10 A·g^(−1)after 3000 cycling for NiS_(2)/S@C).The detailed investigation of mechanism revealed that the powerful adsorption for Na2S4 originated from 3D metal sulfide-carbon structure.The well-designed architecture of sulfide-carbon composites servers as an electrocatalyst to alleviate the shuttle effect of polysulfides,resulting in the long-term electrochemical stability.Given this,the work is expected to provide promising insights for designing advanced cathode materials for RT-Na/S batteries.展开更多
基金supported by the Specialized Research Fund of Langfang Teachers College for the scientific research
文摘We report the microstructure, application for lithium-ion batteries of mesoporous Co304 prepared by modified KIT-6 template method. The sample was characterized by XRD, TEM, HRTEM and nitrogen adsorption. Their electrochemical behaviors as electrode reactants for lithium ion batteries were evaluated by cyclic voltammograms and static charge-discharge. A direct comparison of electrochemical behaviors between mesoporous nanostructure and bulk reflects interesting ＂nanostructure effect＂, which is reasonably discussed in terms of how the 3D nanostructures of Co3O4 materials function in tuning their electrochemistry. The results demonstrate that further improvement of electrochemical performance in transition metal-oxide-based anode materials can be realized via the design of multiporous nanostructured materials.
基金supported by the Science and Technology Foundation of Guizhou Province(YQK[2023]033 and ZDSYS[2023]006)Department of Education of Guizhou Province(QJJ[2022]003 and QJJ[2023]006)Tongren Science and Technology Bureau(2022-(2020)-041).
文摘Comprehensive Summary Room-temperature sodium-sulfur(RT-Na/S)batteries display attractive potential in large-scale energy-storage,but their practical application was still restricted by the serious dissolution of polysulfides.Herein,supported by the constructing of interface engineering,the metal sulfide-carbon nanocomposite can be prepared with considerable electrochemical properties.Utilizing the double-helix structure of carrageenan-metal hydrogels as precursors,in-situ metal sulfide(MxSy)nanostructure/3D carbon aerogels(3D CAs)can be successfully constructed.Importantly,with the assistance of the vulcanization process,3D carbon architecture was maintained in the composites and acted as a skeleton to optimize their structural stability.As the cathode of RT-Na/S batteries,ZnS/S@C and NiS_(2)/S@C delivered an excellent cycling stability and rate performance(179.8 mAh·g^(−1)at 20 A·g^(−1)after 10000 cycling for ZnS/S@C,220.3 mAh·g^(−1)at 10 A·g^(−1)after 3000 cycling for NiS_(2)/S@C).The detailed investigation of mechanism revealed that the powerful adsorption for Na2S4 originated from 3D metal sulfide-carbon structure.The well-designed architecture of sulfide-carbon composites servers as an electrocatalyst to alleviate the shuttle effect of polysulfides,resulting in the long-term electrochemical stability.Given this,the work is expected to provide promising insights for designing advanced cathode materials for RT-Na/S batteries.
