Affiliation:
1. Key Laboratory of Optic‐Electronic Information and Materials of Hebei Province Hebei Research Center of the Basic Discipline for Computational Physics College of Physics Science and Technology Hebei University Baoding 071002 P. R. China
2. Key Laboratory of Physics and Technology for Advanced Batteries (Ministry of Education) College of Physics Jilin University Changchun 130012 P. R. China
3. SEU‐FEI Nano‐Pico Center Key Laboratory of MEMS of the Ministry of Education Southeast University Nanjing 210096 P. R. China
4. Key Laboratory of Carbon Materials of Zhejiang Province Wenzhou University Wenzhou 325035 P. R. China
Abstract
AbstractWith an increasingly profound understanding of battery materials, strategies designed for interface protection have become more sophisticated. However, it is inherent that different materials used in electrodes and electrolytes tend to react with each other. To address this issue, this study proposes an “Electrode‐Electrolyte‐In‐One” (EEIO) concept, where a single energy storage material can serve as both electrode and solid‐state electrolyte (SSE) during its different ion storage stages. The EEIO materials of chloride ion batteries and fluorine ion batteries are preliminarily studied, establishing reasonable screening procedures and predicting their operational mechanisms. The analysis of Cl− and F− affinity indicates that the EEIO system in the anion storage batteries comprises the anode and SSE. Through comprehensive evaluation of ion binding capacity, phase transformation mechanism, electrical conductivity, and ion diffusion kinetic properties, several potential EEIO materials are identified. In the EEIO system, the material interface and the conductive‐insulation interface are separated, which solves the material compatibility problem between the anode and SSE. Furthermore, the EEIO system has an inherent correlation between the anode electrochemical reaction and the SSE decomposition reaction, ensuring that the electrochemical voltage of EEIO batteries never exceeds the decomposition voltage of SSE. Therefore, SSE in the EEIO battery has absolute electrochemical stability.