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首页> 外文期刊>Advanced energy materials >Insights into the Effects of Electrolyte Composition on the Performance and Stability of FeF_2 Conversion-Type Cathodes
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Insights into the Effects of Electrolyte Composition on the Performance and Stability of FeF_2 Conversion-Type Cathodes

机译：电解质组成对FEF_2转换型阴极性能和稳定性的影响

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摘要

As an alternative to commercial Ni- and Co-based intercalation-type cathode materials, conversion-type metal fluoride (MFx) cathodes are attracting more interest due to their promises to increase cell-level energy density when coupled with lithium (Li) or silicon (Si)-based anodes. Among metal fluorides, iron fluorides (FeF2 and FeF3) are regarded as some of the most promising candidates due to their high capacity, moderately high potential and the very low cost of Fe. In this study, the impacts of electrolyte composition on the performance and stability of nanostructured FeF2 cathodes are systematically investigated. Dramatic impacts of Li salt composition, Li salt concentration, solvent composition, and cycling potential range on the cathode's most critical performance parametersstability, capacity, rate, and voltage hysteresis are discovered. In contrast to previous beliefs, it is observed that even if the Fe2+ cation dissolution could be avoided, the dissolution of F- anions may still negatively affect cathode performance. Formation of the more favorable cathode solid electrolyte interface (CEI) is found to minimize both processes.
机译：作为商业Ni-and Co-and基型阴极材料的替代方案，转化型金属氟化物（MFX）阴极由于它们的承诺而引起更多的利益，以增加电池级能量密度时加上锂（Li）或硅（SI）基于阳极。在金属氟化物中，铁氟化物（FEF2和FEF3）被视为由于它们的高容量，适度高的电位和Fe的低成本而被视为一些最有前景的候选物。在该研究中，系统研究了电解质组合物对纳米结构FeF2阴极的性能和稳定性的影响。发现Li盐组合物，Li盐浓度，溶剂组合物和循环电位范围对阴极最关键的性能参数，容量，速率和电压滞后的巨大影响。与先前的信仰相反，观察到，即使可以避免Fe2 +阳离子溶解，F-Theach的溶解仍可能对阴极性能产生负面影响。发现形成更有利的阴极固体电解质界面（CEI）以最小化两个过程。

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