Year: 2025
Type: article
Abstract: Sodium‐ion batteries (SIBs) encounter substantial operational challenges under elevated temperature and pressure conditions. Herein, a novel electrolyte is designed to stabilize the NaNi 1/3 Fe 1/3 Mn 1/3 O 2 (NFM) cathode by adding Ethoxy(pentafluoro)cyclotriphosphazene (PFPN) as a functional additive. PFPN effectively modulates the solvation structure of Na⁺ in the first solvation shell, significantly lowering the desolvation energy barrier. Furthermore, PFPN promotes a robustcathode electrolyte interphase (CEI) film enriched with NaF, NaCl, and Na 3 N, which exhibits enhanced Young's modulus and ionic conductivity.The C‐F bonds from PFPN decompositionfurther enhance the CEI's thermal stability. Furthermore, PFPN suppresses sodium expansion and reduce the release of CO 2 and H 2 . Electrochemical tests demonstrate a dramatic enhancement in capacity retention i, from 43.34% to 78.07% after 300 cycles for NFM//Na coin cells at 45 °C, and 1 C/5 C (2–4.1 V). Moreover, PFPN enhances the wettability of highly loaded electrode materials and electrolytes, facilitating the application of modified electrolytes in NFM//HC full coin cellsand exhibiting excellent cycling stability over 1000 cycles, with a minimal weekly capacity attenuation rate of ≈0.02%. Furthermore, the Ah‐grade pouch cell exhibits excellent cycling stability with 83.79% capacity retention after 500 cycles.
Source: Small
Authors: Qian Wang, Qian Wang, Xinming Fan, Qingyuan Yang, Yong Ji, Yongtian Li, Shan Liu, Chaofan Tang, Lu Zhou, Hui Tang, Lingka Zhu, Runjin Liu, Wence Sun, Jiaojiao Tan, Qiang Wang, Qiang Wang, Xueyi Guo
Institution: Central South University
Language: English
Subfield: Electrical and Electronic Engineering
Field: Engineering
Domain: Physical Sciences
Open Access status: bronze
OpenAlex ID: W4416133994