Highly Stable Fe 2+ /Ti 3+ ‐Based Fluoride Cathode Enabling Low‐Cost and High‐Performance Na‐Ion Batteries

材料科学 氟化物 插层(化学) 阴极 扩散 离子 储能 八面体 化学工程 纳米技术 分析化学(期刊) 无机化学 物理化学 热力学 功率(物理) 化学 物理 色谱法 量子力学 工程类
作者
Jungmin Kang,Jinho Ahn,Hyun Young Park,Wonseok Ko,Yongseok Lee,Seokjin Lee,Sangyeop Lee,Sung-Kyun Jung,Jongsoon Kim
出处
期刊:Advanced Functional Materials [Wiley]
卷期号:32 (29): 2201816-2201816 被引量:4
标识
DOI:10.1002/adfm.202201816
摘要

Grid-scale energy storage system is the need of batteries with low-cost, high-energy-density, and long cycle life. The requirement promotes the discovery of cathode materials enabling the storage of charge carrier ion within the open framework crystal structure having multi-dimensional diffusion path exhibiting small volume change. Herein, Na2TiFeF7 is reported as a promising fluoride-based cathode material for sodium-ion batteries (SIBs). Through combined studies using various experiments and first-principles calculations, it is confirmed that Na2TiFeF7 with 3D diffusion pathway delivers a specific capacity of ≈185 mAh g−1 at C/20 with an average operation voltage of ≈3.37 V (vs Na+/Na) including the high Fe2+/3+ redox potential (≈3.75 V). Even at 5C, a specific capacity of ≈136 mAh g−1 is retained (≈73% of its theoretical capacity) owing to the low band gap energy (≈1.83 eV) and the low activation barrier energies (≈477.68 meV) required for facile Na+ diffusion, indicating the excellent power-capability. Moreover, Na2TiFeF7 composed of three-dimensionally interconnected (Fe, Ti)F6 octahedra delivers an outstanding capacity retention of ≈71% after 600 cycles at 1 C owing to the small structural volume change (≈0.96%) during Na+ de/intercalation. These findings provide insight into the development of fluoride-based novel cathode materials for high-performance SIBs.
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