Dual-Cation Electrolytes for High-Power and High-Energy LTO//AC Hybrid Capacitors,The Journal of Physical Chemistry C

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Dual-Cation Electrolytes for High-Power and High-Energy LTO//AC Hybrid Capacitors
The Journal of Physical Chemistry C ( IF 3.3 ) Pub Date : 2020-05-19 , DOI: 10.1021/acs.jpcc.0c01916
Yu Chikaoka ₁ , Etsuro Iwama _{1,

2} , Tsukasa Ueda ₁ , Natsuki Miyashita ₁ , Shinichi Seto ₁ , Masato Sakurai ₁ , Wako Naoi ₃ , McMahon Thomas Homer Reid _{2,

4} , Patrice Simon _{2,

5,

6} , Katsuhiko Naoi _{1,

2,

7}

Affiliation

Dual-cation electrolyte systems, which contain two cations [Li⁺ and spiro-1,1′-bipyrrolidinium (SBP⁺), are proposed to enhance the power capability of hybrid capacitors composed of thick Li₄Ti₅O₁₂ (LTO) negative (200 μm) and activated carbon (AC) positive electrodes (400 μm), which thus reduces the resistive overvoltage in the system. Detailed studies of the mass transport properties based on the combination of spectroscopy and electrochemical analysis have shown that the presence of SBP⁺, despite slower Li⁺ transport in the electrolyte bulk, further reduces overvoltage associated with migration limitation in the thick LTO electrode macropores. This study on the dual-cation electrolyte quantifies the influence of the addition of a supporting electrolyte and shows interest in SBPBF₄ addition for increasing the output power density of hybrid capacitors with a thick electrode configuration.

中文翻译：

适用于大功率和高能量LTO // AC混合电容器的双阳离子电解质

为了增强由厚Li ₄ Ti ₅ O ₁₂（LTO）负极组成的混合电容器的功率性能，提出了包含两个阳离子[Li ⁺和螺1,1'-联吡咯烷鎓（SBP ⁺）]的双阳离子电解质系统。（200μm）和活性炭（AC）正极（400μm），从而减少了系统中的电阻性过电压。基于光谱和电化学分析的组合的质量传输性质的详细研究表明，SBP存在⁺，尽管慢栗⁺电解质块中的迁移，进一步降低了与厚LTO电极大孔中迁移限制相关的过电压。这项对双阳离子电解质的研究量化了添加支持电解质的影响，并显示出对添加SBPBF _4的兴趣，以增加具有厚电极配置的混合电容器的输出功率密度。

更新日期：2020-05-19

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