A Superlattice‐Stabilized Layered Oxide Cathode for Sodium‐Ion Batteries

Abstract

Sodium‐ion batteries are in high demand for large‐scale energy storage applications. Although it is the most prevalent cathode, layered oxide is associated with significant undesirable characteristics, such as multiple plateaus in the charge−discharge profiles, and cation migration during repeated cycling of Na‐ions insertion and extraction, which results in sluggish kinetics, capacity loss, and structural deterioration. Here, a new strategy, i.e., the manipulation of transition‐metal ordering in layered oxides, is proposed to show a prolonged charge−discharge plateau and cation‐migration‐free structural evolution. The results demonstrate that the transition‐metal ordering with a honeycomb‐type superlattice can adjust the crystal lattice and suppress cation migration by modifying the crystal strain to realize a large reversible capacity and excellent cycling performance, which are not characteristics of the widely used common layered oxides. These findings can provide new insight that can be used to improve the design of high‐performance electrode materials for secondary‐ion batteries.

Probing the Effect of Titanium Substitution on the Sodium Storage in Na3Ni2BiO6 Honeycomb-Type Structure

“…The phase P'3 is an intermediate state between the P3 and O3 structure. The appearance of the P'3 phase was also previously reported for the Na 3 Ni 2 RuO 6 composition [26]. Li et al [26] suggest that the O3 to P3 phase transition occurs as a gradual change process, where various intermediate phases such as O 3 and O 3 or P'3 phases can exchange each other or coexist.…”

“…The appearance of the P'3 phase was also previously reported for the Na 3 Ni 2 RuO 6 composition [26]. Li et al [26] suggest that the O3 to P3 phase transition occurs as a gradual change process, where various intermediate phases such as O 3 and O 3 or P'3 phases can exchange each other or coexist. In the case of the Ti-containing material compositions, the exchange of the O'3 intermediate phase by the P'3 phase is observed.…”

“…The O3-P3 two-phase reaction at 3.31 V is caused by the TMO 2 slabs gliding without breaking the TM-O bonds during the desodiation process. At the same time, the oxygen packing of the TM layers changes from "AB CA BC" to "AB BC CA" [26]. This means that the phase transition is a reconstructive one, therefore necessarily of 1st order and prone to coexisting phases.…”

Amorphous NaVOPO 4 as a High-Rate and Ultrastable Cathode Material for Sodium-Ion Batteries

“…[1][2][3][4][5][6] Over the last decade, tremendous efforts have been devoted to develop high-performance electrode materials for SIBs. [7][8][9] As cathode materials, metal oxides, [10][11][12][13][14][15] polyanions, [16][17][18][19][20][21][22][23][24] and ferricyanides [25][26][27] have been extensively investigated, and they have shown decent Na-storage performance. However, the huge volume/phase variation during (de)sodiation, slow diffusion of Na + ions in the zigzag lattice frameworks, and insufficient electronic conductivity of these cathode materials have only led to moderate electrochemical properties and sluggish kinetics for Na storage.…”

Microsized SnS/Few‐Layer Graphene Composite with Interconnected Nanosized Building Blocks for Superior Volumetric Lithium and Sodium Storage

“…[5][6][7] Meanwhile, it has also inspired increasing research in sodium-ion batteries (SIBs), which shows great prospect to replace the LIBs because of its more abundant resource and much lower cost. [8][9][10][11][12][13] Nonetheless, SnS encounters serious capacity fading caused by the large volume change during electrochemical process. [14][15][16] Recently, the electrochemical performance of SnS has been enhanced by grafting nanosized SnS in various types of carbon matrices (e.g., carbon spheres, amorphous carbon, macroporous carbon, carbon nanotubes, or graphene), since these matrices can greatly promote the electron/ion transfer and effectively accommodate the cycle-induced stress/strain of SnS.…”