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首页> 外文期刊>Journal of Alloys and Compounds: An Interdisciplinary Journal of Materials Science and Solid-state Chemistry and Physics >Synergistic effect of amorphous carbon coverage and enlarged voltage window on the superior lithium storage performance of nanostructured mesoporous anatase TiO_2: Emphasis on interfacial storage phenomena
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Synergistic effect of amorphous carbon coverage and enlarged voltage window on the superior lithium storage performance of nanostructured mesoporous anatase TiO_2: Emphasis on interfacial storage phenomena

机译：非晶碳覆盖和扩大电压窗口对纳米结构析析酶TiO_2优质锂储存性能的协同作用：强调界面储存现象

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摘要

Mesoporous anatase TiO_2 nanoparticles coated with an ultrathin layer of amorphous carbon are hydro-thermally synthesized. Used as an anode material, it achieves a sustained superior lithium storage performance, presenting a high reversible capacity of 270 mA h g~(-1) up to 300 cycles at a current density of 30 mA h g~(-1) in an enlarged voltage window of 0.01 -3 V, which is firstly adopted for TiO_2 anode material. Remarkably, the carbon coated TiO_2 nanoparticles can still maintain a capacity of 171 mA h g~(-1) at 300 mA g~(-1) after 1000 cycles, and even 93 mA h g~(-1) at 600 mA g~(-1) after 1000 cycles. We propose an overall view on the diverse features influencing the electrochemical performance of the high-surface-area mesoporous carbon coated TiO_2 nanoparticles and emphasize that the excellent performance is the synergistic result of the enlarged voltage window, which leads to higher interfacial lithium storage, and the uniform amorphous carbon coverage, which not only improves electrical conductivity, minimizes the direct solid-electrolyte interphase (SEI) formation, but also helps to avoid the structure instability arising from the enlargement of the potential window.
机译：涂有非晶碳超薄层的中孔锐钛矿TiO_2纳米颗粒是水性合成的。用作阳极材料，它实现了持续的优异锂储存性能，在放大电压下以30 mA Hg〜（-1）的电流密度为370 mA Hg〜（-1）的高可逆容量。 0.01 -3 V的窗口，首先采用TiO_2阳极材料。值得注意的是，在1000次循环后，碳涂覆的TiO_2纳米颗粒仍然可以在300mA g〜（-1）下保持171mA Hg〜（-1）的容量，甚至在600 mA g〜（ -1）1000次循环后。我们提出了对影响高表面积介孔碳涂覆的TiO_2纳米颗粒的电化学性能的多样性特征的整体观点，并强调优异的性能是扩大电压窗口的协同结果，从而导致更高的界面锂储存，以及不仅提高导电性的均匀无定形碳覆盖率最小化了直接固体电解质相互作用（SEI）的形成，而且有助于避免从潜在窗口的扩大产生的结构不稳定。

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