DataVXACS Energy LettersPaper
journal article·2022-05-13

How Prussian Blue Analogues Can Be Stable in Concentrated Aqueous Electrolytes

Lu Chen, Wenlu Sun, Kui Xu, Qingyu Dong, Lei Zheng, Jun Wang, Derong Lu, Yanbin Shen, Junyu Zhang, Fang Fu, Huabin Kong, Jiaqian Qin, Hongwei Chen

ACS Energy Letters· Volume 7· Issue 5
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Source abstract

Abstract

Prussian blue analogues (PBAs) are promising candidates for storing various ions in aqueous electrolytes. But they often suffer from metal-ion dissolution induced structural degradation, resulting in fast capacity fade and short cycle life. Long-term cycling of PBAs has recently been successfully demonstrated by using highly concentrated aqueous electrolytes, while the stabilization mechanism of PBAs in the electrolytes has remained unclear. In this work, the experimental and molecular modeling evidence indicates that the hydrophobic layer on the PBA/electrolyte interface and the highly restricted network in the concentrated aqueous electrolyte both play critical roles in suppressing metal-ion dissolution of PBAs. That explains why the NH4+ full battery consisting of a PBA cathode can be stably cycled over 4000 cycles with 72.3% capacity retention (8C). The molecular-level understanding of the stabilization mechanism establishes a guiding principle for the stable storage of diverse ions in PBAs, including but not limited to NH4+, Li+, Na+, Mg2+, etc.
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Research context

Energy storage

OpenAlex topics: Advanced battery technologies research · Advanced Battery Materials and Technologies · Advancements in Battery Materials

SciVX discovery tags are terminology-based. OpenAlex topics are source-provided classifications.

Affiliations

Department of Materials Science and Engineering, Huaqiao University, Xiamen 361021, China

Key Laboratory of Flexible Electronics & Institute of Advanced Materials, Jiangsu National Synergetic Innovation Center for Advanced Materials, Nanjing University of Technology, Nanjing 211816, China

i-Lab, Suzhou Institute of Nano-Tech and Nano-Bionics (SINANO), Chinese Academy of Sciences, Suzhou 215123, China

School of Chemical and Biomedical Engineering, Nanyang Technological University, 70 Nanyang Drive, 637457 Singapore

Center of Excellence in Responsive Wearable Materials, Metallurgy and Materials Science Research Institute, Chulalongkorn University, Bangkok 10330, Thailand

Department of Xiamen Key Laboratory of Optoelectronic Materials and Advanced Manufacturing, College of Materials Science and Engineering, Huaqiao University, Xiamen 361021, China

Funding

Natural Science Foundation of Jiangsu Province · Natural Science Foundation of Fujian Province · Natural Science Foundation of Xiamen City

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