Synthesis of Iron Phosphate and Their Composites for Lithium/Sodium Ion Batteries

Abstract High‐performance electric energy storage material has recently developed due to the attention for sustainable development. As ecofriendly energy storage device, lithium ion batteries and sodium ion batteries deserve more concern today. FePO 4 and NaFePO 4 share similar advantages such as easy preparation, abundant, and inexpensive, so they can be ideal materials for lithium/sodium ion batteries. This review is focused on recent progresses in nanostructured FePO 4 /NaFePO 4 ‐based nanomaterial as cathode materials for lithium/sodium ion batteries. FePO 4 ‐based materials contain crystalline and amorphous pure FePO 4 nanomaterial, FePO 4 /C compounds, and other novel materials with unique morphologies. NaFePO 4 ‐based materials contain olivine NaFePO 4 , Na 4 FeP 2 O 7 , and so on. They own unique properties, including preferable energy density, cycling performance, electrical conductivity, and charge/discharge stability. This review is designed to summarize the synthesis, morphology, and electrochemical property and application of FePO 4 ‐based and NaFePO 4 ‐based nanomaterials. There exist relations among the structure, property, and storage, which is also introduced. Furthermore, this review assesses the challenges and outlooks of FePO 4 /NaFePO 4 ‐based nanomaterial for future development; it also sheds light on appropriate development direction of advanced rechargeable batteries with a focus on FePO 4 /NaFePO 4 ‐based nanomaterial.