Research progress in O3-type phase Fe/Mn/Cu-based layered cathode materials for sodium ion batteries

Abstract

Sodium ion batteries have become one of the research hotspots in the field of energy storage. Due to the comprehensive advantages in specific capacity, working voltage, and cost, layered oxides...

Optimizing Vanadium Redox Reaction in Na3V2(PO4)3 Cathodes for Sodium-Ion Batteries by the Synergistic Effect of Additional Electrons from Heteroatoms

“…In recent years, sodium-ion batteries (SIBs) have been gradually introduced into the commercial layout of the energy storage field, and its related large-scale production technology has also attracted attention. − Na 3 V 2 (PO 4 ) 3 (NVP) stands out in various cathode materials for SIBs due to its excellent Na + diffusion and structural stability. , As a polyanionic material, its stable lantern-shaped skeleton and strong P–O bonds make it exhibit strong thermal stability and cycle stability . Owing to the induction of the polyanionic groups, the V 3+ /V 4+ redox pair is active at 3.4 V, thus leading to a high theoretical energy density of 400 W h kg –1 . − Long cycle life and outstanding rate capability further make it a great application prospect in the fields of electric bicycle and rechargeable energy storage systems.…”

“…Owing to the induction of the polyanionic groups, the V 3+ /V 4+ redox pair is active at 3.4 V, thus leading to a high theoretical energy density of 400 W h kg –1 . − Long cycle life and outstanding rate capability further make it a great application prospect in the fields of electric bicycle and rechargeable energy storage systems. From the perspective of application, abundant resources and low cost are the primary requirements of SIBs. ,, However, battery-grade vanadium requiring a complex purification process , inevitably causes elevated raw material cost and limits advancement from the laboratory scale to commercialization of NVP. Vanadium–titanium magnetite is the most dominant raw vanadium output. , Although the components of the ore vary greatly from generation to generation, the phase composition in vanadium slag from enrichment is similar .…”

A novel hierarchical book-like structured sodium manganite for high-stable sodium-ion batteries

“…4,5 Therefore, it is very important to seek a new type of secondary battery system with low cost, high safety and long cycle life for the application of large-scale energy storage equipment. [6][7][8] Because of the abundance and wide distribution of sodium resources, SIBs have become the primary choice for large-scale energy storage. [9][10][11][12][13] However, compared with lithium-ion batteries (LIBs), SIBs generally have a lower energy density due to the heavier and less reductive nature of sodium ions than lithium ions.…”

Study of Synergistic Effects of Cu and Fe on P2-Type Na0.67MnO2 for High Performance Na-Ion Batteries

“…Global efforts have been devoted to explore the cathode materials, forming a system of Na-ion battery cathode materials based on layered metal oxides, polyanionic compounds, and Prussian blue derivatives. − Among them, layered manganese-based metal oxide (Na x MnO 2 , 0.5 ≤ x ≤ 1), due to the advantages of low cost, easy synthesis, and high theoretical capacity, becomes one of the ideal candidates for cathode materials. − According to the oxygen stacking mode and sodium occupancy site in the cell, Na x MnO 2 can be divided into four structural types: P2, O2, P3, and O3, and the most common are P2 and O3 phases. , The O3-type Na x MnO 2 (0.7 < x ≤ 1) usually exhibit poor electrochemical kinetics due to Na + need to overcome the high-energy barrier to pass through the tetrahedral interstices. , P2-type Na x MnO 2 (0.44 < x ≤ 0.7) has a stable structure and an open framework suitable for sodium-ion transport resulting in better properties in terms of capacity retention and rate performance. − However, the complex phase transformation during cycling and the lattice distortion induced by the Jahn–Teller effect constrain the electrochemical performance of P2-type Na 0.67 MnO 2 . , …”

“…24,25 The O3-type Na x MnO 2 (0.7 < x ≤ 1) usually exhibit poor electrochemical kinetics due to Na + need to overcome the high-energy barrier to pass through the tetrahedral interstices. 26,27 P2-type Na x MnO 2 (0.44 < x ≤ 0.7) has a stable structure and an open framework suitable for sodium-ion transport resulting in better properties in terms of capacity retention and rate performance. 28−30 However, the complex phase transformation during cycling and the lattice distortion induced by the Jahn−Teller effect constrain the electrochemical performance of P2-type Na 0.67 MnO 2 .…”