期刊
JOURNAL OF THE ELECTROCHEMICAL SOCIETY
卷 169, 期 3, 页码 -出版社
ELECTROCHEMICAL SOC INC
DOI: 10.1149/1945-7111/ac58c8
关键词
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资金
- National Science Foundation [1653827, ECCS-1542015]
- State of North Carolina
- Office of Naval Research
- Direct For Mathematical & Physical Scien
- Division Of Materials Research [1653827] Funding Source: National Science Foundation
This study investigates the role of structural water in transition metal oxides during Li+ insertion. The presence of structural water improves the kinetics of Li+ insertion and reduces the potential-dependent insertion process.
Electrochemical ion insertion into transition metal oxides forms the foundation of several energy technologies. Transition metal oxides can exhibit sluggish ion transport and/or phase-transformation kinetics during ion insertion that can limit their performance at high rates (<10 min). In this study, we investigate the role of structural water in transition metal oxides during Li+ insertion using staircase potentiostatic electrochemical impedance spectroscopy (SPEIS) and electrochemical quartz crystal microbalance (EQCM) analysis of WO3 center dot H2O and WO3 thin-film electrodes. Overall, the presence of structural water in WO3 center dot H2O improves Li+ insertion kinetics compared to WO3 and leads to a less potential-dependent insertion process. Operando electrogravimetry and 3D Bode impedance analyses of nanostructured films reveal that the presence of structural water promotes charge accommodation without significant co-insertion of solvent, leading to our hypothesis that the electrochemically induced structural transitions of WO3 hinder the electrode response at faster timescales (<10 min). Designing layered materials with confined fluids that exhibit less structural transitions may lead to more versatile ion-insertion hosts for next-generation electrochemical technologies.
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