"Mn-locking" effect by anionic coordination manipulation stabilizing Mn-rich phosphate cathodes.

ABSTRACT: High-voltage cathodes with high power and stable cyclability are needed for high-performance sodium-ion batteries. However, the low kinetics and inferior capacity retention from structural instability impede the development of Mn-rich phosphate cathodes. Here, we propose light-weight fluorine (F) doping strategy to decrease the energy gap to 0.22 eV from 1.52 eV and trigger a "Mn-locking" effect-to strengthen the adjacent chemical bonding around Mn as confirmed by density functional theory calculations, which ensure the optimized Mn ligand framework, suppressed Mn dissolution, improved structural stability and enhanced electronic conductivity. The combination of in situ and ex situ techniques determine that the F dopant has no influence on the Na⁺ storage mechanism

SUBMITTER: Zhang W 

PROVIDER: S-EPMC10430554 | biostudies-literature | 2023 Aug

REPOSITORIES: biostudies-literature