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首页> 外文会议>Materials Research Society Meeting >Electrochemical Performance of Lithium-Ion Hybrid Supercapacitors based on Activated Carbon and Nanoplatelet Li_4Ti_5O_(12) Insertion Electrode Synthesized by Nanoscission Technique
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Electrochemical Performance of Lithium-Ion Hybrid Supercapacitors based on Activated Carbon and Nanoplatelet Li_4Ti_5O_(12) Insertion Electrode Synthesized by Nanoscission Technique

机译：基于活性炭的锂离子杂交超级电容器的电化学性能，纳米辐射技术合成的基于活性炭和纳米薄荷Li_4Ti_5O_（12）插入电极

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摘要

Electrochemical performance of hybrid supercapacitor (HSC) utilizing surface sculpted Li_4Ti_5O_(12) (LTO) insertion electrode having nanoplatelet-like morphology and activated carbon (AC) electrode is investigated for energy storage application. Cyclic voltammetry (CV) at variable scan rates 0.5 to 60 mV.s~(-1) in the 0-3.2 V range show pseusocapacitive behavior and fast rate of current change indicating rapid Faradaic kinetics. Nyquist impedance study show charge transfer resistance due to kinetic effects of electron transfer and Li~+ de-intercalation process at the LTO anode. Low capacity (0.2 C-1C) charge-discharge (CD) curves show high Coulomb efficiency with marginal reduction at high 5-10 C rates due to irreversibility of adsorbed PF_6 anions at the electrolyte-AC interface. Galvanostatic CD cycling tests over 50 cycles at different C-rates show decline in storage capacity due to electrode polarization effects. Reduction, broadening and shift of the Raman line at 678 cm~(-1) from Ti-O bonds in TiO_6 octahedra after cycling indicates Li insertion reactions in functioning of hybrid supercapacitor. The hybrid supercapacitor cells have shown energy density, 29 Wh.kg~(-1) and power density, 350 W.kg~(-1).
机译：研究了利用表面雕刻的Li_4Ti_5O_（12）（LTO）插入电极的杂化超级电容器（HSC）的电化学性能进行了具有纳米片状形态和活性炭（AC）电极的能量储存应用。在0-3.2V范围内的可变扫描速率0.5至60 mV.S〜（-1）的循环伏安法（CV）显示伪张涂布性行为和表明快速法拉第动力学的电流变化的快速速率。奈奎斯特阻抗研究表明，由于电子转移和LI〜+解层工艺在LTO阳极的动力学效应引起的电荷转移阻力。低容量（0.2C-1C）电荷 - 放电（CD）曲线显示出高5-10℃的高豆仑效率，由于电解质-AC接口的吸附PF_6阴离子的不可逆转度，高5-10℃。 Galvanostatic CD循环试验在不同的C率下超过50个循环显示由于电极极化效应导致的储存容量下降。在循环后，从TiO_6八面体中的Ti-O键在678cm〜（-1）下的拉曼线的减少，扩大和移位，表明杂交超级电容器功能中的LI插入反应。杂交超级电容器细胞显示能量密度，29hkg〜（-1）和功率密度，350w.kg〜（-1）。

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