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首页> 外文期刊>RSC Advances >Enhanced cycle life and capacity retention of iron oxide ultrathin film coated SnO2 nanoparticles at high current densities
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Enhanced cycle life and capacity retention of iron oxide ultrathin film coated SnO2 nanoparticles at high current densities

机译：高电流密度下氧化铁超薄膜包覆的SnO2纳米粒子的循环寿命和容量保持时间延长

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摘要

Tin oxide (SnO2) has a high theoretical capacity (similar to 782 mA h g(-1)), but it experiences large volume changes during charge and discharge cycles that cause rapid capacity fade, which limits its practical use as an anode material. In an attempt to solve this, we coated these particles with ultrathin electrochemically active iron oxide (FeOx) films that act as an artificial solid electrolyte interphase layer, thus stabilizing the SnO2 particles for better longevity of significantly improved performance at high current densities in a practical voltage window. Since there exists a tradeoff between species transport and protection of particles (expecting long life), a film with an optimum thickness was achieved by atomic layer deposition (ALD) of FeOx on SnO2 particles. With an optimum thickness of about 0.24 nm after 20 cycles of iron oxide ALD (20Fe), an initial capacity of similar to 658 mA h g(-1) was achieved at a high current density of 1250 mA g(-1). After 1000 cycles of charge/discharge at 1250 mA g(-1), the 20Fe sample showed a capacity retention of 94% as compared to 52% of the uncoated sample when cycled at room temperature; at 55 degrees C, the capacity retention of the 20Fe sample was 93% compared to 33% of the uncoated sample.
机译：氧化锡（SnO2）具有较高的理论容量（类似于782 mA h g（-1）），但在充电和放电周期中会发生较大的体积变化，从而导致容量快速衰减，从而限制了其作为负极材料的实际应用。为了解决这个问题，我们在这些颗粒上涂覆了超薄的电化学活性氧化铁（FeOx）膜，该膜可用作人造固体电解质相间层，从而稳定了SnO2颗粒，从而具有更长的使用寿命，并且在实际应用中在高电流密度下具有显着改善的性能。电压窗口。由于需要在物质迁移和保护颗粒之间进行权衡（考虑到长寿命），因此通过在SnO2颗粒上进行FeOx原子层沉积（ALD），可以得到具有最佳厚度的薄膜。氧化铁ALD（20Fe）循环20次后，最佳厚度约为0.24 nm，在1250 mA g（-1）的高电流密度下，初始容量接近658 mA h g（-1）。在1250 mA g（-1）下进行1000次充/放电循环后，在室温下循环时20Fe样品的容量保持率为94％，而未涂覆样品的容量保持率为52％。在55摄氏度下，20Fe样品的容量保留率为93％，而未涂层样品的容量保留率为33％。

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