Advanced Functional Materials, Год журнала: 2025, Номер unknown

Опубликована: Июнь 2, 2025

Abstract The practical deployment of sodium metal anodes (SMAs) is hindered by dendrite growth, unstable solid‐electrolyte interphase, and severe volume fluctuations. Herein, an in situ constructed mixed ion/electron‐conducting (MIEC) artificial interphase comprising Co nanoparticles NaCl nanocrystals proposed to address these challenges. This layer forms spontaneously via a displacement reaction between CoCl 2 Na, yielding dual‐phase structure where ionic‐conducting domains are interspersed with electron‐conducting nanocrystals. phase ensures ultralow Na⁺ diffusion barriers (0.058 eV), while the network enhances sodiophilicity (−5.98 eV for Na adsorption energy) mechanical robustness (5.02 GPa Young's modulus), enabling uniform deposition suppression. Consequently, Co/NaCl/Na||Cu half‐cell exhibits excellent cyclability, achieving average Coulombic efficiency 99.89% over 1000 cycles at 5 mA cm −2 h . In symmetric cells, Co/NaCl/Na electrode maintains stable operation 4 under high depth discharge 75%. Full cell coupled 3 V (PO ) retains 82 g −1 after 8 C. work demonstrates scalable strategy stabilize SMAs through robust MIEC paving way next‐generation batteries.

Язык: Английский