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Self-supported SnO2 nanowire electrodes for high-power lithium-ion batteries

机译:用于大功率锂离子电池的自支撑SnO2纳米线电极

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We propose a promising synthetic technique, which we term 'self-supported nanostructuring', for the direct growth of one-dimensional, SnO2 nanowires on the current collector. The technique is based on a vapor-liquid-solid (VLS) mechanism via thermal evaporation at low synthetic temperature (600 degrees C). The as-synthesized SnO2 nanowire electrode did not have any buffer layer prior to the nanowire evolution, and exhibited a single crystalline phase with highly uniform morphology and a thin diameter ranging from 40 to 50 nm with a length of more than 1 mu m. The SnO2 nanowire electrode demonstrated stable cycling behaviors and delivered a high specific discharge capacity of 510 mA h g(-1), even at the 50th cycle, which exceeded that of SnO2 nanopowder and Sn nanopowder electrodes. Furthermore, the SnO2 nanowire electrode displayed superior rate capabilities with a rechargeable discharge capacity of 600 mA h g(-1) at 3 C (where 1 C = 782 mA g(-1)), 530 mA h g(-1) at 5 C, and 440 mA h g(-1) at 10 C. Our results support the potential opportunity for developing high-performance Li-ion batteries based on Li-alloying anode materials in terms of high-power density and high-energy density.
机译:我们提出了一种有前途的合成技术,我们称之为“自支撑纳米结构”,用于在集电器上直接生长一维SnO2纳米线。该技术基于在低合成温度(600摄氏度)下通过热蒸发的汽-液-固(VLS)机理。合成后的SnO2纳米线电极在纳米线进化之前没有任何缓冲层,并且表现出具有高度均一形态的单晶相和40至50 nm的细直径,且长度超过1μm。 SnO2纳米线电极表现出稳定的循环行为,即使在第50次循环时也具有510 mA h g(-1)的高比放电容量,超过了SnO2纳米粉和Sn纳米粉电极。此外,SnO2纳米线电极在3 C时具有600 mA hg(-1)的可充电放电容量(其中1 C = 782 mA g(-1)),在5 C时530 mA hg(-1)的充电速率显示出卓越的速率性能。 ,以及在10 C时为440 mA hg(-1)。我们的研究结果为开发基于锂合金阳极材料的高性能锂离子电池在高功率密度和高能量密度方面提供了潜在的机会。

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