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首页> 外文期刊>RSC Advances >Enhanced lithium storage capability of a dual-phase Li4Ti5O12-TiO2-carbon nanofiber anode with interfacial pseudocapacitive effect
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Enhanced lithium storage capability of a dual-phase Li4Ti5O12-TiO2-carbon nanofiber anode with interfacial pseudocapacitive effect

机译：具有界面伪电容效应的双相Li4Ti5O12-TiO2-碳纳米纤维阳极的增强的锂存储能力

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摘要

Hydrothermal treatments of electrospun titanium dioxide/carbon nanofibers (TiO2/CNFs) in LiOH solution were performed in a temperature range of 130-190 degrees C, and then followed by a thermal treatment at 600 degrees C in N-2 atmosphere. The changes in morphologies, microstructures and compositions as well as the electrochemical performances with hydrothermal temperatures were investigated for all samples. The morphological and compositional characterizations showed that the surfaces of the CNFs-matrix were covered by numerous nanoparticles with size distributions of 25-100 nm. For the sample hydrothermally treated at 150 degrees C (denoted as LC-150), these nanoparticles (similar to 25 nm) were composed of well-crystalline spinel Li4Ti5O12 and anatase TiO2 with abundant phase interfaces and grain boundaries, which can induce the interfacial pseudocapacitive effect. Therefore, the as-prepared dual-phase structured Li4Ti5O12-TiO2-CNFs sample as a binder-free anode for lithium-ion batteries (LIBs) presented a greatly enhanced reversible capacity (203.8 mA h g(-1) at 100 mA g(-1) after 200 cycles) and a favored rate capability (114.3 mA h g(-1) at 2000 mA g(-1)) compared with the single-phase Li4Ti5O12-CNFs sample.
机译：在130-190摄氏度的温度范围内，对LiOH溶液中的电纺二氧化钛/碳纳米纤维（TiO2 / CNFs）进行水热处理，然后在N-2气氛中于600摄氏度进行热处理。研究了所有样品的形貌，微观结构和组成以及水热温度下的电化学性能变化。形态和组成特征表明，CNFs-基质的表面被尺寸为25-100 nm的许多纳米颗粒覆盖。对于在150摄氏度下进行水热处理的样品（表示为LC-150），这些纳米颗粒（类似于25 nm）由具有良好相界面和晶界的良好结晶的尖晶石Li4Ti5O12和锐钛矿TiO2组成，可诱发界面假电容影响。因此，作为锂离子电池（LIBs）的无粘结剂阳极制备的双相结构化Li4Ti5O12-TiO2-CNFs样品在100 mA g（- 1）200个周期后）和比单相Li4Ti5O12-CNFs样品有利的速率能力（2000 mA g（-1）时为114.3 mA hg（-1））。

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