Surface reconstruction driven by low oxygen chemical potential sintering: unlocking superior material properties

作者：Shuai Zhang, Jiexi Wang, Zhengwei Xu, Muzhou Li, Zhixing Wang, Huajun Guo, Xinhai Li, Wenjie Peng, Hui Duan, Guangchao Li, Guochun Yan · 发表于：Chemical Science · 年份：2025 · DOI：10.1039/d5sc04020e · 被引用次数：7 · 研究领域：MXene and MAX Phase Materials、Semiconductor materials and devices、Advanced materials and composites

with 85.6% capacity retention after 500 cycles in a pouch full-cell. Mechanistic studies reveal that LOCP sintering induces surface oxygen vacancies while enabling Na deintercalation and surface sodium residual accumulation. These oxygen vacancies promote bulk-to-surface Ti migration alongside Mn valence reduction, ultimately driving structural phase transitions. DFT calculations confirm that oxygen vacancies reduce Ti migration barriers, elucidating the atomic-scale transformation mechanism. This work sheds light on surface engineering of O3-type layered oxides and provides valuable insights for developing high-voltage sodium-ion batteries with extended cyclability.