材料科学
假电容
纳米棒
阳极
电容器
阴极
功率密度
化学工程
电解质
纳米技术
静电纺丝
离子
电极
超级电容器
电化学
复合材料
工程类
物理
量子力学
物理化学
功率(物理)
电压
化学
聚合物
作者
Yuan‐En Zhu,Leping Yang,Jian Sheng,Yanan Chen,Haichen Gu,Jinping Wei,Zhen Zhou
标识
DOI:10.1002/aenm.201701222
摘要
Abstract Na‐ion capacitors have attracted extensive interest due to the combination of the merits of high energy density of batteries and high power density as well as long cycle life of capacitors. Here, a novel Na‐ion capacitor, utilizing TiO 2 @CNT@C nanorods as an intercalation‐type anode and biomass‐derived carbon with high surface area as an ion adsorption cathode in an organic electrolyte, is reported. The advanced architecture of TiO 2 @CNT@C nanorods, prepared by electrospinning method, demonstrates excellent cyclic stability and outstanding rate capability in half cells. The contribution of extrinsic pseudocapacitance affects the rate capability to a large extent, which is identified by kinetics analysis. A key finding is that ion/electron transfer dynamics of TiO 2 @CNT@C could be effectively enhanced due to the addition of multiwalled carbon nanotubes. Also, the biomass‐derived carbon with high surface area displays high specific capacity and excellent rate capability. Owing to the merits of structures and excellent performances of both anode and cathode materials, the assembled Na‐ion capacitors provide an exceptionally high energy density (81.2 W h kg −1 ) and high power density (12 400 W kg −1 ) within 1.0–4.0 V. Meanwhile, the Na‐ion capacitors achieve 85.3% capacity retention after 5000 cycles tested at 1 A g −1 .
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