锂/钠离子电池中铁基氟化物正极材料的研究进展

Recent Progress of Iron-Based Fluoride Cathodes in Lithium/Sodium Ion Batteries

摘要:

随着电化学储能技术的快速发展，传统脱嵌型正极材料由于理论容量低且成本高等特点，逐渐无法满足3C产品和电动汽车对能量密度提升的需求。转化型正极材料，特别是氟化物材料，因理论容量高、氧化还原电位高、价格低廉等优势引起了广泛关注。但现阶段，以铁基氟化物为代表的转化型正极材料仍存在电压滞后、体积膨胀大、离子电导率差等问题，极大限制了其规模化应用。系统地总结了铁基氟化物正极材料现阶段面临的关键科学问题和潜在的解决方案，最后结合商业化电化学储能技术的发展历程，对铁基氟化物正极材料的发展方向做出了展望。

Abstract:

With the rapid development of electrochemical energy storage technology， the traditional intercalation/deintercalation cathode materials are gradually unable to meet the needs of electronic products and electric vehicles for increasing energy density. Conversion-type cathode materials， especially fluoride materials， have attracted wide attention due to their high theoretical capacity， high redox potential， and low price. However， the iron-based fluoride cathode material still faces some challenges such as voltage hysteresis， large volume expansion， and poor ionic conductivity at this stage. The aforementioned issues significantly deteriorate the electrochemical performance of its full cells， which greatly limits its practical application. Herein， we systematically summarize the key scientific issues and feasible solutions for iron-based fluoride cathode materials. Besides， combined with the development of commercial electrochemical energy storage technology， we prospect the potential roadmap of iron-based fluoride cathode materials in the future.