Here, a P2-type layered Na Zn TeO (NZTO) is reported with a high Na ion conductivity ≈0.6×10 S cm at room temperature (RT), which is comparable to the currently best Na Zr Si P O NASICON structure. As small amounts of Ga substitutes for Zn , more Na vacancies are introduced in the interlayer gaps, which greatly reduces strong Na -Na coulomb interactions. Ga-substituted NZTO exhibits a superionic conductivity of ≈1.1×10 S cm at RT, and excellent phase and electrochemical stability. All solid-state batteries have been successfully assembled with a capacity of ≈70 mAh g over 10 cycles with a rate of 0.2 C at 80 °C. Na nuclear magnetic resonance (NMR) studies on powder samples show intra-grain (bulk) diffusion coefficients D on the order of 12.35×10 m s at 65 °C that corresponds to a conductivity σ of 8.16×10 S cm , assuming the Nernst-Einstein equation, which thus suggests a new perspective of fast Na ion conductor for advanced sodium ion batteries.
Download full-text PDF |
Source |
|---|---|
| http://dx.doi.org/10.1002/chem.201705466 | DOI Listing |
Publication Analysis
Top Keywords
Similar Publications
Local Structure Regulation for Oxygen Redox and Structure Stability of P2-Type Cathodes.
Small
January 2025
Materials Genome Institute, Shanghai University, Shanghai, 200444, China.
The local structure plays a crucial role in oxygen redox reactions, which boosts the capacity of layered oxide cathodes for sodium-ion batteries. While studies on local structural ordering have primarily focused on the intra-layer ordering, there has been limited research on the inter-layer stacking for the layered cathode materials for sodium-ion batteries. In this work, the impact of the intra-layer and inter-layer local structural regulation on anionic kinetics and the structure stability are explored through experimental analysis and theoretical calculations.
View Article and Find Full Text PDFA High-Entropy Engineering on Sustainable Anionic Redox Mn-Based Cathode with Retardant Stress for High-Rate Sodium-Ion Batteries.
Angew Chem Int Ed Engl
December 2024
Institute of Advanced Battery Materials and Devices, College of Materials Science and Engineering, Beijing University of Technology, Beijing, 100124, China.
Manganese-based (Mn-based) layered oxides have emerged as competitive cathode materials for sodium-ion batteries (SIBs), primarily due to their high energy density, cost-effectiveness, and potential for mass production. However, these materials often suffer from irreversible oxygen redox reactions, significant phase transitions, and microcrack formation, which lead to considerable internal stress and degradation of electrochemical performance. This study introduces a high-entropy engineering strategy for P2-type Mn-based layered oxide cathodes (HE-NMCO), wherein a multi-ingredient cocktail effect strengthens the lattice framework by modulating the local environmental chemistry.
View Article and Find Full Text PDFDual-Substitution Strategy Utilizing Cation Chelation and Assembly Process to Realize Solid Solution Reaction in Layered Oxide Cathode for Na-Ion Batteries.
Small
December 2024
School of Materials Science and Engineering, State Key Laboratory of Optoelectronic Materials and Technologies, Sun Yat-sen University, Guangzhou, 510275, P. R. China.
NaNiMnO (NNM) is regarded as a promising cathode material for Na-ion batteries (NIBs), but suffers from irreversible phase transformations characterized by multiple voltage plateaus, resulting in poor cycle stability and inferior rate capability. To address these issues, the NaNiCuZnMnO (NNCZM) cathode material is synthesized by a cation chelation and reassembly process, which can promote a more uniform element distribution than that prepared by the solid-state method (S-NNCZM), resulting in better Na diffusion kinetics and rate capability. Replacing Ni with a small amount of Zn prevents the P2-O2 phase transformation, while replacing Ni with an appropriate amount of electrochemically active Cu eliminates Na-vacancy ordering and additionally contributes to capacity.
View Article and Find Full Text PDFEfficient pathways to improve electrode performance of P'2 NaMnO for sodium batteries.
Chem Commun (Camb)
December 2024
Department of Chemistry and Life Science, Yokohama National University, 79-5 Tokiwadai, Hodogaya-ku, Yokohama 240-8501, Japan.
A Mn-based sodium-containing layered oxide, P'2-type NaMnO, is revisited as a positive electrode material for sodium-ion batteries, and factors affecting its electrochemical performances are examined. The cyclability of NaMnO is remarkably improved by increasing the lower cut-off voltage during cycling even though the reversible capacity is sacrificed. Furthermore, the use of highly concentrated electrolytes, in which the presence of free solvent molecules is eliminated, effectively suppresses the dissolution of Mn ions, thus enabling stable cycling with >85% capacity retention for 300 continuous cycles.
View Article and Find Full Text PDFSynergistic Enhancement of Cathode Performance through the Introduction of Oxygen Vacancies in the P2/P3 Mixed Phase.
ACS Appl Mater Interfaces
December 2024
College of Chemical and Biological Engineering, Zhejiang University, Hangzhou 310027, China.
P2-type NaNiMnO cathodes have attracted attention due to their excellent stability and low cost, making them promising for sodium-ion batteries. However, their practical application is limited by a low capacity at lower voltages and severe phase transitions at higher voltage. To address these challenges, we report a material NaNiMnO-OVs (NNMO-OVs) with significantly slowed phase transitions at high voltage by introducing oxygen vacancies OVs into the P2/P3 mixed phase cathode NaNiMnO (NNMO).
View Article and Find Full Text PDFWant AI Summaries of new PubMed Abstracts delivered to your In-box?
Enter search terms and have AI summaries delivered each week - change queries or unsubscribe any time!