Carbon nanotubes （CNTs） are excellent scaffolds for advanced electrode materials, resulting from their intrinsic sp2 carbon hybridization, interconnected electron pathway, large aspect ratio, hierarchical porous str...Carbon nanotubes （CNTs） are excellent scaffolds for advanced electrode materials, resulting from their intrinsic sp2 carbon hybridization, interconnected electron pathway, large aspect ratio, hierarchical porous structures, and low cost at a large-scale production. How to make full utilization of the mass produced CNTs as building blocks for nanocomposite electrodes is not well understood yet. Herein, a composite cathode containing commercial agglomerated multi-walled CNTs and S for Li-S battery was fabricated by a facile melt-diffusion strategy. The hierarchical CNT@S coaxial nanocables exhibited a discharging capacity of 1020 and 740 mAh .g-1 at 0.5 and 2.0 C, respectively. A rapid capacity decay of 0.7% per cycle at the initial 10 cycles and a slow decay rate of 0.14% per cycle for the later 140 cycles were detected. Such hierarchical agglomerated CNT@ S cathodes show advantages in easy fabrication, environmentally benign, low cost, excellent scalability, and good Li ion storage performance, which are extraordinary composites for high performance Li-S battery.展开更多
在Cu基底上,采用催化热解生长法制备了石墨化程度较高的碳纳米管阴极.当电子束能量达到1 Me V、梯度约为60 k V/ns时,发射束流强度达到15 k A,相应密度约为1 k A/cm2,束压、束流响应快,波形间几无延时.以50 Hz重复频率、约15 GW束功率...在Cu基底上,采用催化热解生长法制备了石墨化程度较高的碳纳米管阴极.当电子束能量达到1 Me V、梯度约为60 k V/ns时,发射束流强度达到15 k A,相应密度约为1 k A/cm2,束压、束流响应快,波形间几无延时.以50 Hz重复频率、约15 GW束功率强流发射时,波形稳定,随着频率增高,稳定性降低.发射炮次达1000后,表面形貌保持完整、界面无脱附;束压与束流基本满足空间电荷限制定律,发射机理属闪络型等离子体发射,等离子体速度约为3.9 cm/μs.展开更多
基金supported by National Basic Research Program of China (973 Program, 2011CB932602)Research Fund for the Doctoral Program of Higher Education of China (20120002120047)China Postdoctoral Science Foundation (2012M520293)
文摘Carbon nanotubes （CNTs） are excellent scaffolds for advanced electrode materials, resulting from their intrinsic sp2 carbon hybridization, interconnected electron pathway, large aspect ratio, hierarchical porous structures, and low cost at a large-scale production. How to make full utilization of the mass produced CNTs as building blocks for nanocomposite electrodes is not well understood yet. Herein, a composite cathode containing commercial agglomerated multi-walled CNTs and S for Li-S battery was fabricated by a facile melt-diffusion strategy. The hierarchical CNT@S coaxial nanocables exhibited a discharging capacity of 1020 and 740 mAh .g-1 at 0.5 and 2.0 C, respectively. A rapid capacity decay of 0.7% per cycle at the initial 10 cycles and a slow decay rate of 0.14% per cycle for the later 140 cycles were detected. Such hierarchical agglomerated CNT@ S cathodes show advantages in easy fabrication, environmentally benign, low cost, excellent scalability, and good Li ion storage performance, which are extraordinary composites for high performance Li-S battery.
文摘在Cu基底上,采用催化热解生长法制备了石墨化程度较高的碳纳米管阴极.当电子束能量达到1 Me V、梯度约为60 k V/ns时,发射束流强度达到15 k A,相应密度约为1 k A/cm2,束压、束流响应快,波形间几无延时.以50 Hz重复频率、约15 GW束功率强流发射时,波形稳定,随着频率增高,稳定性降低.发射炮次达1000后,表面形貌保持完整、界面无脱附;束压与束流基本满足空间电荷限制定律,发射机理属闪络型等离子体发射,等离子体速度约为3.9 cm/μs.
