Na-Se batteries have caught tremendous attention because of natural abundant of element sodium and their high volumetric energy density(2530 Wh/L).However,the low utilization ratio of Se is the main obstacle for pract...Na-Se batteries have caught tremendous attention because of natural abundant of element sodium and their high volumetric energy density(2530 Wh/L).However,the low utilization ratio of Se is the main obstacle for practical application.Herein,an advanced Se-based electrode is designed and prepared by using tea stem-derived micropore carbon matrix(TSC)as Se host and coating TSC/Se with cyclic polyacrylonitrile(cPAN).TSC/Se/cPAN electrode shows rate capacity of 318.3 mAh/g at 2 C(1 C=675 mA/g)and great discharge capacity of 420.6 mAh/g after 300 cycles at 0.2 C.The impressive electrochemical performance is mainly ascribed to the interface design of c PAN coating,resulting in the enhanced electronic conductivity of whole electrode and high ratio of robust inorganic salt NaCl in CEI film.The TSC/Se/c PAN||NVP full cell also exhibits great discharge capacity of 556.6 mAh/g after 55 cycles at 0.1 C.展开更多
Na-Se电池因其较高的理论容量,被认为具有较高的研究价值.但是由于其在充放电过程中的仍存在大倍率性能弱,充放电容量低的问题.所以需要设计新的电池结构材料以解决上述问题.本文通过一步热解法利用过渡金属镍原位催化生长碳纳米管,用Ni...Na-Se电池因其较高的理论容量,被认为具有较高的研究价值.但是由于其在充放电过程中的仍存在大倍率性能弱,充放电容量低的问题.所以需要设计新的电池结构材料以解决上述问题.本文通过一步热解法利用过渡金属镍原位催化生长碳纳米管,用Ni/CTs修饰聚丙烯隔膜用于Na-Se电池中以改善其电化学性能.结果表明,使用Ni/CTs修饰的隔膜在Na-Se电池中表现出良好的循环和倍率性能.在0.2 C电流密度下循环100圈后仍有354 mAh g^(-1)的比容量,在20 C的大电流密度下仍具有213 mAh g^(-1)的比容量,并且回到1 C电流密度下仍有283.7 mAh g^(-1)的比容量.展开更多
All-solid-state(ASS)Na-S batteries are promising for large-scale energy storage because of the incombustible solid electrolyte and avoiding the dissolution of intermediates.However,the poor contact between the active ...All-solid-state(ASS)Na-S batteries are promising for large-scale energy storage because of the incombustible solid electrolyte and avoiding the dissolution of intermediates.However,the poor contact between the active material and the solid electrolyte in the positive electrode leads to poor electrochemical performance.Here,we report an aqueous solution approach to fabricate Na3SbS4-coated SexS-based active materials for a Na-S battery working at room temperature.Compared with the Na3SbS4 and SexS mixed cathode,the coated cathode achieves significantly improved Na-ion diffusion kinetics and reduced impedance resistance.Additionally,the nanoparticle coating sustains the volume expansion of the cathode during cycling.The resulting batteries deliver an intensively enhanced specific capacity at various rates.Regardless of the mass loading,the Na3SbS4-coated cathode maintains a decent reversible capacity for the long-term discharge/charge cycling.The best battery achieves an initial discharge capacity of509 mAh g^-1 at a current density of 437.4 mA g^-1 and capacity retention of 98.9%for 100 cycles.To the best of our knowledge,this is one of the best room temperature ASS Na-S battery so far.This work demonstrates that Na3SbS4 is very promising for the cathode coating purpose for ASS Na-S batteries.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 Na_(2)S_(4) 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financially supported by Fujian Science and Technology Planning Projects of China(Nos.2022T3067 and 2023H0045)the Self-deployment Project Research Programs of Haixi Institutes,Chinese Academy of Sciences(No.CXZX2022-JQ12)the XIREM autonomously deployment project(No.2023GG02)。
文摘Na-Se batteries have caught tremendous attention because of natural abundant of element sodium and their high volumetric energy density(2530 Wh/L).However,the low utilization ratio of Se is the main obstacle for practical application.Herein,an advanced Se-based electrode is designed and prepared by using tea stem-derived micropore carbon matrix(TSC)as Se host and coating TSC/Se with cyclic polyacrylonitrile(cPAN).TSC/Se/cPAN electrode shows rate capacity of 318.3 mAh/g at 2 C(1 C=675 mA/g)and great discharge capacity of 420.6 mAh/g after 300 cycles at 0.2 C.The impressive electrochemical performance is mainly ascribed to the interface design of c PAN coating,resulting in the enhanced electronic conductivity of whole electrode and high ratio of robust inorganic salt NaCl in CEI film.The TSC/Se/c PAN||NVP full cell also exhibits great discharge capacity of 556.6 mAh/g after 55 cycles at 0.1 C.
文摘Na-Se电池因其较高的理论容量,被认为具有较高的研究价值.但是由于其在充放电过程中的仍存在大倍率性能弱,充放电容量低的问题.所以需要设计新的电池结构材料以解决上述问题.本文通过一步热解法利用过渡金属镍原位催化生长碳纳米管,用Ni/CTs修饰聚丙烯隔膜用于Na-Se电池中以改善其电化学性能.结果表明,使用Ni/CTs修饰的隔膜在Na-Se电池中表现出良好的循环和倍率性能.在0.2 C电流密度下循环100圈后仍有354 mAh g^(-1)的比容量,在20 C的大电流密度下仍具有213 mAh g^(-1)的比容量,并且回到1 C电流密度下仍有283.7 mAh g^(-1)的比容量.
基金supported by the National Key R&D Program of China(grant no.2018YFB0104300)the Natural Science Foundation of Hebei Province(E2018203301)。
文摘All-solid-state(ASS)Na-S batteries are promising for large-scale energy storage because of the incombustible solid electrolyte and avoiding the dissolution of intermediates.However,the poor contact between the active material and the solid electrolyte in the positive electrode leads to poor electrochemical performance.Here,we report an aqueous solution approach to fabricate Na3SbS4-coated SexS-based active materials for a Na-S battery working at room temperature.Compared with the Na3SbS4 and SexS mixed cathode,the coated cathode achieves significantly improved Na-ion diffusion kinetics and reduced impedance resistance.Additionally,the nanoparticle coating sustains the volume expansion of the cathode during cycling.The resulting batteries deliver an intensively enhanced specific capacity at various rates.Regardless of the mass loading,the Na3SbS4-coated cathode maintains a decent reversible capacity for the long-term discharge/charge cycling.The best battery achieves an initial discharge capacity of509 mAh g^-1 at a current density of 437.4 mA g^-1 and capacity retention of 98.9%for 100 cycles.To the best of our knowledge,this is one of the best room temperature ASS Na-S battery so far.This work demonstrates that Na3SbS4 is very promising for the cathode coating purpose for ASS Na-S batteries.
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 Na_(2)S_(4) 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.
