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Amorphous Cu-added/SnOx/CNFs composite webs as anode materials with superior lithium-ion storage capability

机译:非晶铜添加/ SnOx / CNFs复合纤维网作为阳极材料,具有出色的锂离子存储能力

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Amorphous Cu-added tin oxides/carbon nanofiber (Cu-added SnOx/CNFs) composite webs used for lithium-ion battery anode materials are prepared by an electrospinning technique and subsequent thermal treatment. The Cu-doped SnOx particles are uniformly distributed in the CNFs and maintain the original morphology after long-term cycling. In a controlled experiment, SnOx-20%Cu/CNFs with an atomic ratio of Cu : Sn = 0.2 shows the highest electrochemical performance with a high reversible capacity of 743 mA h g(-1) at a current density of 200 mA g(-1) and an excellent rate capacity of 347 mA h g(-1) at 5 A g(-1). Moreover, the composite electrode exhibits an outstanding long-term cycling performance at 2 A g(-1) even after 1000 cycles. The superior reversible lithium-ion storage capability is attributed to the uniform dispersion of the Cu2O and ultrafine SnOx particles in CNFs as well as the Cu-addition effects such as promoting electron transport and Li+ diffusion, preventing Sn from aggregation during cycling, and improving the reversibility of Sn back to SnOx in the recharge process.
机译:通过电纺丝技术和随后的热处理来制备用于锂离子电池负极材料的无定形添加了铜的氧化锡/碳纳米纤维(添加有铜的SnOx / CNFs)复合纤维网。铜掺杂的SnOx颗粒均匀分布在CNF中,经过长期循环后仍保持原始形态。在受控实验中,原子比为Cu:Sn = 0.2的SnOx-20%Cu / CNFs显示出最高的电化学性能,在200 mA g(-)的电流密度下具有743 mA hg(-1)的高可逆容量。 1),在5 A g(-1)时具有347 mA hg(-1)的出色倍率容量。此外,即使经过1000次循环,复合电极在2 A g(-1)下仍具有出色的长期循环性能。优异的可逆锂离子存储能力归因于Cu2O和超细SnOx颗粒在CNF中的均匀分散,以及铜的添加效应,如促进电子传输和Li +扩散,防止Sn在循环过程中聚集以及改善碳纳米管。在充电过程中,Sn可逆转为SnOx。

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