Pseudocapacitance Behavior in Battery Materials: Phase Transitions and Charge Compensation Governed by Ionic Spatial Equilibrium
Pseudocapacitance behavior in conventional battery electrodes is widely attributed to the reduction of material dimensions and the increase in current density, where bulk and interfacial contributions are conventionally separated through electrochemical techniques.However, the underlying chemical mechanisms governing this phenomenon have remained elusive.By designing size-controlled Prussian blue analogue electrodes, we isolate these two critical factors: the current density and particle dimension.To elucidate the universal origin of pseudocapacitance responses, we employ a time-resolved synchrotron-radiation-based multitechnique approach, revealing its phase transition suppression and accelerated charge-transfer kinetics.Experimental findings demonstrate that the homogeneity of ion diffusion serves as the primary determinant governing the progressive transition from battery-type to pseudocapacitance behavior.These results establish a fundamental correlation between ion diffusion characteristics and the pseudocapacitance response in electrode materials, offering critical insights for designing cathode architectures that simultaneously achieve a high energy density and high power density.
Authors
- Yongfeng Hu (ORCID: https://orcid.org/0000-0002-7510-9444)
- Dingguo Xia (ORCID: https://orcid.org/0000-0003-2191-236X)
- Wangsheng Chu (ORCID: https://orcid.org/0000-0002-6268-2102)
- Yuqi Yang (ORCID: https://orcid.org/0000-0003-2255-850X)
- Xiaozhi Su (ORCID: https://orcid.org/0000-0002-8658-4056)
- Shuangming Chen (ORCID: https://orcid.org/0000-0001-7567-1552)
- Zhanshuai Ma
- Yu Wang (ORCID: https://orcid.org/0000-0002-9071-0238)
- Li Song (ORCID: https://orcid.org/0000-0003-0585-8519)
- Songqi Gu
- Nian Zhang (ORCID: https://orcid.org/0000-0002-9124-6553)
- Yang Si (ORCID: https://orcid.org/0000-0002-0074-8209)
- Jing Zhou (ORCID: https://orcid.org/0000-0002-4193-637X)
- Yongheng Chu
Institutions
- Sinopec (China) (CN)
- University of Science and Technology of China (CN)
- Zhejiang Normal University (CN)
- Chinese Academy of Sciences (CN)
- Peking University (CN)
- ShanghaiTech University (CN)
- Light Industry Hangzhou Electromechanical Design Institute (CN)
- Shanghai Advanced Research Institute (CN)
- National Synchrotron Radiation Laboratory (CN)
- Shanghai Synchrotron Radiation Facility
Publication Details
- Journal
- ACS Energy Letters
- Published
- 2025-08-17
- DOI
- https://doi.org/10.1021/acsenergylett.5c01769
- Citations
- 1
- Primary Topic
- Advancements in Battery Materials
- Type
- article
- Field-Weighted Citation Impact
- 0.73
Funders
- National Natural Science Foundation of China
- Chinese Academy of Sciences
- Science and Technology Commission of Shanghai Municipality
- Zhejiang Normal University
- Youth Innovation Promotion Association of the Chinese Academy of Sciences
- Peking University
- University of Science and Technology of China
- ShanghaiTech University
- National Synchrotron Radiation Laboratory
- National Key Research and Development Program of China
- Youth Innovation Promotion Association
- Shanghai Advanced Research Institute, Chinese Academy of Sciences
- SINOPEC Shanghai Research Institute of Petrochemical Technology
- Natural Science Foundation of Zhejiang Province