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Dual metal oxides interconnected by carbon nanotubes for high-capacity Li- and Na-ion batteries

机译：双金属氧化物通过碳纳米管互连，用于高容量的Li-和Na离子电池

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摘要

Sb2O3 and Co3O4 as potential anode materials for Li- and Na-ion batteries exhibit high theoretical capacities and excellent electrochemical stability; however, volume expansion, exfoliation and poor electronic conductivity affect the electrochemical performance to some extent. Here, we design dual metal oxide hybrid composites by one- and two-step solvothermal processes, in which Co3O4 with Sb2O3 traps Li+ ions and carbon nanotubes (CNTs) as a network guarantee for electron transport. Sb2O3/CNTs/Co3O4 and Sb2O3/Co3O4/CNTs composites exhibit different morphologies, particles sizes and Li+/Na+ storage performance. The Sb2O3/CNTs/Co3O4 composite showes initial capacities of 1790 and 1450 mAh g(-1) after 100 cycles as the anode for a Li-ion battery. The capacity retention of the Sb2O3/Co3O4/CNTs composite is better than the Sb2O3/CNTs/Co3O4 composite for Na-ion storage. With charge/discharge cycles, the transition reaction of Sb2O3 and Co3O4 to Sb and Co repeats, leading to a homogenous distribution in CNTs and further growth of the nanoparticles. This work provides new insights into the design of high-capacity anodes for Li- and Na-ion storage by adjusting their composition and morphology.
机译：SB2O3和CO3O4作为Li-和Na离子电池的潜在阳极材料表现出高理论能力和优异的电化学稳定性;然而，体积膨胀，去角质和差的电子电导率在一定程度上影响电化学性能。这里，我们通过单步和两步溶解的方法设计双金属氧化物杂化复合材料，其中CO3O4与SB2O3捕获Li +离子和碳纳米管（CNT）作为电子传输的网络保证。 SB2O3 / CNT / CO3O4和SB2O3 / CO3O4 / CNTs复合材料表现出不同的形态，颗粒尺寸和Li + / Na +储存性能。在100个循环作为锂离子电池的阳极之后，Sb2O3 / CNTS / CO3O4复合材料显示100次循环后的初始容量为1790和1450mAhg（-1）。 Sb2O3 / CO3O4 / CNTS复合材料的容量保持优于Na离子储存的Sb2O3 / CNT / CO3O4复合材料。充电/放电循环，Sb2O3和CO 3 O 4至Sb和Co重复的过渡反应，导致CNT的均匀分布和纳米颗粒的进一步生长。通过调整它们的组成和形态，这项工作通过调整它们的组成和形态来为LI-和NA离子储存的高容量阳极设计提供新的见解。

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