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Engineering Electrode/Electrolyte Interphase Chemistry toward High-Rate and Long-Life Potassium Ion Full-Cell
ACS Energy Letters ( IF 19.3 ) Pub Date : 2023-01-18 , DOI: 10.1021/acsenergylett.2c02659 Ying Mo 1 , Wang Zhou 1 , Kexuan Wang 2 , Kuikui Xiao 3 , Yuqing Chen 1 , Zixing Wang 1 , Pei Tang 1 , Peitao Xiao 4 , Yuxuan Gong 5 , Shi Chen 2 , Peng Gao 1 , Jilei Liu 1
ACS Energy Letters ( IF 19.3 ) Pub Date : 2023-01-18 , DOI: 10.1021/acsenergylett.2c02659 Ying Mo 1 , Wang Zhou 1 , Kexuan Wang 2 , Kuikui Xiao 3 , Yuqing Chen 1 , Zixing Wang 1 , Pei Tang 1 , Peitao Xiao 4 , Yuxuan Gong 5 , Shi Chen 2 , Peng Gao 1 , Jilei Liu 1
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Controlling the interfacial chemistries of the cathode and anode in potassium ion full-cells is critically important for better K+ storage; however, the correlation between cathode electrolyte interphase (CEI) and solid electrolyte interphase (SEI) and its effect on electrochemical performance is poorly understood, not mention their rational matchup. In this study, an electrochemical modification strategy has been employed for the tailored design of both the CEI on a K2Fe[Fe(CN)6] (KFeHCF) surface and the SEI on a graphite (Gr) surface. The optimized matchup between CEI and SEI realized a good rate and cycling performance in KFeHCF/Gr full-cells, which is attributed to the presence of a robust, homogeneous, and conductive SEI that contains chemically stable PEO (−(CH2CH2O)n−) and K2CO3. Our results not only promoted fundamental understanding of interfacial chemistry on K+ storage, but also provided rational design strategy to realize enhanced efficiency and durability of potassium ion full-cells, which can also be extended to other energy storage systems.
中文翻译：
工程电极/电解质界面化学，实现高倍率和长寿命钾离子全电池
控制钾离子全电池中阴极和阳极的界面化学对于更好的 K +存储至关重要；然而，人们对正极电解质界面（CEI）和固体电解质界面（SEI）之间的相关性及其对电化学性能的影响知之甚少，更不用说它们的合理搭配了。在这项研究中，采用电化学修饰策略对 K 2 Fe[Fe(CN) 6上的 CEI 进行定制设计] (KFeHCF) 表面和石墨 (Gr) 表面上的 SEI。CEI 和 SEI 之间的优化匹配在 KFeHCF/Gr 全电池中实现了良好的倍率和循环性能，这归因于包含化学稳定的 PEO (−(CH 2 CH 2 O ) n -) 和K 2 CO 3。我们的研究结果不仅促进了对 K +存储界面化学的基本理解，而且提供了合理的设计策略以实现钾离子全电池的更高效率和耐久性，这也可以扩展到其他储能系统。
更新日期：2023-01-18
中文翻译：
工程电极/电解质界面化学，实现高倍率和长寿命钾离子全电池
控制钾离子全电池中阴极和阳极的界面化学对于更好的 K +存储至关重要；然而，人们对正极电解质界面（CEI）和固体电解质界面（SEI）之间的相关性及其对电化学性能的影响知之甚少，更不用说它们的合理搭配了。在这项研究中，采用电化学修饰策略对 K 2 Fe[Fe(CN) 6上的 CEI 进行定制设计] (KFeHCF) 表面和石墨 (Gr) 表面上的 SEI。CEI 和 SEI 之间的优化匹配在 KFeHCF/Gr 全电池中实现了良好的倍率和循环性能，这归因于包含化学稳定的 PEO (−(CH 2 CH 2 O ) n -) 和K 2 CO 3。我们的研究结果不仅促进了对 K +存储界面化学的基本理解，而且提供了合理的设计策略以实现钾离子全电池的更高效率和耐久性，这也可以扩展到其他储能系统。
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