Insights into the Improved High-Voltage Performance of Li-Incorporated Layered Oxide Cathodes for Sodium-Ion Batteries

Abstract

By virtue of their prominent advantages in terms of capacity and voltage output and cost, O3-type layered transition-metal oxides are considered promising cathode materials for sodium-ion batteries (SIBs). However, their unstable electrochemistry at high voltages due to complex multiphase evolution in the bulk structure and continuous degradation of the electrolyte-cathode interphase hampers their practical viability. Here, we reveal a dual-stabilization effect of the cation dopants on the evolution of the bulk structure and electrode-electrolyte interphase of a Li-substituted O3-type cathode upon Na (de)intercalation. The incorporation of Li into the transition-metal layer could mitigate the Jahn-Teller distortion of the Ni 3+ ion and prevent the loss of active transition-metal ions so that the unfavorable high-voltage phase transition and the degradation of the electrolyte-cathode interphase are suppressed. As a result, the Li-incorporated cathode material displays a high reversible capacity with good highvoltage durability to facilitate its service in high-energy-density SIBs.

Metal Sulfide‐Decorated Carbon Sponge as a Highly Efficient Electrocatalyst and Absorbant for Polysulfide in High‐Loading Li2S Batteries

“…[1][2][3][4][5][6][7][8] Rechargeable lithium-sulfur (Li-S) batteries with a high theoretical specific capacity (1675 mA h g −1 ) and nontoxicity and natural abundance of sulfur have been regarded as perhaps the most promising alternative for next-generation energy storage systems. [1][2][3][4][5][6][7][8] Rechargeable lithium-sulfur (Li-S) batteries with a high theoretical specific capacity (1675 mA h g −1 ) and nontoxicity and natural abundance of sulfur have been regarded as perhaps the most promising alternative for next-generation energy storage systems.…”

Pore-size dominated electrochemical properties of covalent triazine frameworks as anode materials for K-ion batteries

“…1,2 However, the scarcity and uneven global distribution of commercially viable lithium resources have seriously hindered the long-term and widespread development of LIBs, which calls for alternative abundant energy storage devices, such as Na-ion (NIBs) and K-ion batteries (KIBs). [3][4][5][6] In comparison to lithium resources which occur at a concentration of 0.0017 wt% in the Earth's crust, the abundance of sodium and potassium elements is 2.36 wt% and 2.09 wt%, respectively. Unlike NIBs which have gained widespread attention, KIBs have been less explored over a long-term period.…”

Novel layered K0.7Mn0.7Ni0.3O2 cathode material with enlarged diffusion channels for high energy density sodium-ion batteries

“…Wang et al [33] cycle stability of such P2-type Mn/Ni-based layered oxides, while the problem of low reversible capacity is neglected. Therefore, the improvement of reversible capacity in this type layered oxide is desired [37][38][39][40]. In previous studies, a fascinating K + pre-intercalation approach was exploited, which enlarged the interlayer spacing to expand the diffusion channels, and then improved the cycling stability and rate capability of the electrode materials [41,42].…”