[Figure3] (IMAGE) National Research Council of Science & Technology Caption 'FeSn2' undergoes particle size reduction due to recombination reactions during repeated charging and discharging, which helps maintain close contact between internal solid particles in SSBs over an extended period. Credit Korea Electrotechnology Research Institute Usage Restrictions The sources of photos and research results from KERI must be specified. License Original content Disclaimer: AAAS and EurekAlert! are not responsible for the accuracy of news releases posted to EurekAlert! by contributing institutions or for the use of any information through the EurekAlert system.