Role of FTFSI Anion Asymmetry on Physical Properties of AFTFSI (A=Li, Na and K) Based Electrolytes and Consequences on Supercapacitor Application,ChemPhysChem

当前位置： X-MOL 学术 › ChemPhysChem › 论文详情

Our official English website, www.x-mol.net, welcomes your feedback! (Note: you will need to create a separate account there.)

Role of FTFSI Anion Asymmetry on Physical Properties of AFTFSI (A=Li, Na and K) Based Electrolytes and Consequences on Supercapacitor Application
ChemPhysChem ( IF 2.3 ) Pub Date : 2021-07-12 , DOI: 10.1002/cphc.202100439
Joseph Chidiac ₁ , Laure Timperman ₁ , Mérièm Anouti ₁

Affiliation

This study compares the physicochemical properties of six electrolytes comprising of three salts: LiFTFSI, NaFTFSI and KFTFSI in two solvent mixtures, the binary (3EC/7EMC) and the ternary (EC/PC/3DMC). The transport properties (conductivity, viscosity) as a function of temperature and concentration were modeled using the extended Jones-Dole-Kaminsky equation, the Arrhenius model, and the Eyring theory of transition state for activated complexes. Results are discussed in terms of ionicity, solvation shell, and cross-interactions between electrolyte components. The application of the six formulated electrolytes in symmetrical activated carbon (AC)//AC supercapacitors (SCs) was characterized by cyclic voltammetry (CV), galvanostatic cycling with potential limitation (GCPL), electrochemical impedance spectroscopy (EIS) and accelerated aging. Results revealed that the geometrical flexibility of the FTFSI anion allows it to access and diffuse easily in AC whereas its counter ions (Li⁺, Na⁺ or K⁺) can remain trapped in porosity. However, this drawback was partially resolved by mixing LiFTFSI and KFTFSI salts in the electrolyte.

中文翻译：

FTFSI 阴离子不对称性对 AFTFSI（A=Li、Na 和 K）基电解质物理性质的影响以及对超级电容器应用的影响

本研究比较了由三种盐组成的六种电解质的物理化学性质：LiFTFSI、NaFTFSI 和 KFTFSI 在两种溶剂混合物中，二元 (3EC/7EMC) 和三元 (EC/PC/3DMC)。使用扩展的 Jones-Dole-Kaminsky 方程、Arrhenius 模型和活化配合物过渡态的 Eyring 理论对作为温度和浓度函数的输运特性（电导率、粘度）进行建模。结果根据离子性、溶剂化壳和电解质组分之间的交叉相互作用进行了讨论。六种配方电解质在对称活性炭（AC）//AC超级电容器（SCs）中的应用通过循环伏安法（CV）、电位限制恒电流循环（GCPL）、电化学阻抗谱（EIS）和加速老化表征。⁺、Na ⁺或 K ⁺ ) 可以保持在孔隙中。然而，通过在电解液中混合 LiFTFSI 和 KFTFSI 盐，可以部分解决这个缺点。

更新日期：2021-09-15

点击分享查看原文

点击收藏

阅读更多本刊最新论文本刊介绍/投稿指南11