Abstract

A novel finding that the electrochemical performance of the commercial lithium titanate (Li₄Ti₅O₁₂, LTO) can be significantly improved by using a novel current collector of CuI particles modified copper foil is reported for the first time in this work. Firstly, a large number of particles with well-defined shapes were prepared on the commercial copper foil surface via a very simple soaking process, in which the soaking solution contained only CuSO₄, H₂SO₄ and [Bmim]I. As indicated by the XRD and XPS measurements, the particles observed on the surface of the copper foil were identified as CuI particles. That is, CuI particles modified copper foils (denoted as CuI/Cu) were successfully prepared at room temperature. CuI/Cu prepared in the presence of 0.4, 0.6 and 0.8 g of [Bmim]I were nominated as CF (copper foil) a, b and c, respectively. Inconceivably, as compared to the conventional LTO electrode, the LTO electrodes assembled using the newly prepared CFs exhibited a significantly improved electrochemical performance, i.e., all as-prepared CFs showed an evident promoting effect on the electrochemical performance of the traditional LTO electrodes. For instance, the initial discharge capacity (DC) of the LTO electrode assembled using CF b (called electrode b) at 0.2 C was 307 mAh g⁻¹, which was about 1.86 times higher than that of the LTO electrode prepared using the conventional copper foil current collector (165 mAh g⁻¹). Particularly, as the applied current rate was as high as 10 C, the DC value of electrode b (117 mAh g⁻¹), even after 100 cycles, was still about 2.54 times that of the traditional LTO electrode (46 mAh g⁻¹). In this preliminary work, a new method for preparing CuI particles was developed, along with a novel approach to significantly improve the electrochemical properties of the commercial LTO electrode. The method did not require any strong oxidants or reducing agents, nor did it demand any additional energy expenditure during the preparation of CuI particles. Moreover, the approach did not require any changes in the assembly procedure for the LTO electrodes being studied. This work was very meaningful for the development of the CuI-related research field as well as for the electrochemical performance improvement of LTO-based lithium-ion batteries (LIBs).

中文翻译：

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通过使用碘化亚铜改性铜箔的新型集流体，显着提高了商用钛酸锂（Li4Ti5O12）的电化学性能

摘要

这项工作首次报道了一项新发现，即通过使用 CuI 颗粒改性铜箔的新型集流体可以显着提高商业钛酸锂（Li ₄ Ti ₅ O _{12 ，LTO）的电化学性能。}首先，通过非常简单的浸泡过程在商业铜箔表面制备大量形状明确的颗粒，其中浸泡溶液仅含有CuSO ₄、H ₂ SO ₄和[Bmim]I。XRD和XPS测量表明，在铜箔表面观察到的颗粒被鉴定为CuI颗粒。即在室温下成功制备了CuI颗粒改性铜箔(记为CuI/Cu)。在 0.4、0.6 和 0.8 g [Bmim]I 存在下制备的 CuI/Cu 分别被指定为 CF（铜箔）a、b 和 c。令人难以置信的是，与传统的LTO电极相比，使用新制备的CF组装的LTO电极表现出显着改善的电化学性能，即所有制备的CF对传统LTO电极的电化学性能都表现出明显的促进作用。例如，使用CF b 组装的LTO电极（称为电极b）在0.2 C下的初始放电容量（DC）为307 mAh g ^-1，这比使用常规铜制备的LTO电极高约1.86倍。箔集流体（165 mAh g ^-1）。特别是，当施加的电流倍率高达10 C时，电极b的DC值（117 mAh g ^-1）即使在100次循环后，仍然是传统LTO电极（46 mAh g ^{-1 ）}的约2.54倍。 ）。在这项前期工作中，开发了一种制备 CuI 颗粒的新方法，以及显着提高商用 LTO 电极电化学性能的新方法。该方法不需要任何强氧化剂或还原剂，在制备 CuI 颗粒过程中也不需要任何额外的能量消耗。此外，该方法不需要对所研究的 LTO 电极的组装程序进行任何改变。这项工作对于CuI相关研究领域的发展以及LTO基锂离子电池（LIB）电化学性能的提升非常有意义。