Comparative Study of Li4Ti5O12 Composites Prepared withPristine, Oxidized, and Surfactant‐Treated Multiwalled Carbon Nanotubes for High‐Power Hybrid Supercapacitors,ChemElectroChem

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Comparative Study of Li4Ti5O12 Composites Prepared withPristine, Oxidized, and Surfactant‐Treated Multiwalled Carbon Nanotubes for High‐Power Hybrid Supercapacitors
ChemElectroChem ( IF 3.5 ) Pub Date : 2018-06-11 , DOI: 10.1002/celc.201800408
Geon-Woo Lee ₁ , Myeong-Seong Kim ₁ , Jun Hui Jeong ₁ , Ha-Kyung Roh ₁ , Kwang Chul Roh ₂ , Kwang-Bum Kim ₁

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In hybrid supercapacitors, lithium‐ion battery (LIB)‐type intercalation materials have slower reaction kinetics than electrical double‐layer‐capacitor‐type carbonaceous materials. Thus, it is of prime importance to improve the rate capability of LIB‐type intercalation materials to achieve high energy density as well as high power density from hybrid supercapacitors. In this study, we report Li₄Ti₅O₁₂/pristine multiwalled carbon nanotube (LTO/P‐MWCNT) composites with high rate capability and demonstrate their anode application for high‐power hybrid supercapacitors. For comparison, two additional LTO composites are prepared by using oxidized MWCNTs and surfactant‐treated MWCNTs through a similar spray‐drying process. The LTO/P‐MWCNT composite shows superior rate capability over the other two composites, owing to the high electrical conductivity of pristine MWCNTs. The hybrid supercapacitor composed of a LTO/P‐MWCNT anode and an activated carbon cathode delivers an energy density of 70.9 Wh kg⁻¹ at a power density of 0.03 kW kg⁻¹ and a maximum power density of 21.8 kW kg⁻¹ is achieved at an energy density of 24.3 Wh kg⁻¹. Furthermore, the hybrid supercapacitor exhibits excellent cycling stability. These salient results provide further impetus to the use of MWCNTs in the design and synthesis of high‐rate oxide‐based composites with efficient lithium‐ion transport and high electrical conductivity for high‐power hybrid supercapacitors and high‐power LIBs.

中文翻译：

用原始，氧化和表面活性剂处理的多壁碳纳米管制备的Li4Ti5O12复合材料用于高功率混合超级电容器的比较研究

在混合超级电容器中，锂离子电池（LIB）型插层材料的反应动力学要比电双层电容器型含碳材料慢。因此，提高LIB型插层材料的速率能力以从混合超级电容器获得高能量密度和高功率密度至关重要。在这项研究中，我们报告了Li ₄ Ti ₅ O ₁₂/原始多壁碳纳米管（LTO / P-MWCNT）复合材料具有高倍率性能，并展示了其在大功率混合超级电容器中的阳极应用。为了进行比较，使用氧化的MWCNT和表面活性剂处理的MWCNT通过类似的喷雾干燥工艺制备了另外两种LTO复合材料。由于原始MWCNT的高电导率，LTO / P-MWCNT复合材料显示出比其他两种复合材料优异的速率性能。由LTO / P-MWCNT阳极和活性炭阴极组成的混合超级电容器在0.03 kW kg ^-1的功率密度下可提供70.9 Wh kg ^-1的能量密度，并且可实现21.8 kW kg ^-1的最大功率密度在24.3 Wh kg ^-1的能量密度下。此外，混合超级电容器表现出出色的循环稳定性。这些显着的结果进一步推动了MWCNT在高效率混合超级电容器和高功率LIB的设计和合成中，具有高效率的锂离子传输和高导电性的高氧化物基复合材料的使用。

更新日期：2018-06-11

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