NaV(PO)F (NVPF), a typical sodium superionic conductor (NASICON) type structure, has attracted much interest as a potential positive electrode in sodium-ion battery. However, the inherently poor electronic conductivity of phosphates compromises the electrochemical properties of this material. Here, we develop a general strategy to improve the electrochemical performance by preparing a new composite material "polyaniline (PANI)@NVPF" using a Pickering emulsion method. The X-ray diffraction and Raman results indicated a successful PANI coating without affecting the NASICON-type structure of NVPF, and they enhanced the interfacial bonding between the two components. Also, thermogravimetric analysis and scanning electron microscopy analyses revealed that the PANI content influenced the thermal stability and morphology of the nanocomposites. As a result, the sodium test cells exhibited multielectron reactions and a better rate performance for PANI@NVPF nanocomposites as compared to NVPF. Specifically, 2%PANI@NVPF maintained 70% of its initial capacity at 5C. Ex-situ electron paramagnetic resonance revealed the existence of mixed valence states of vanadium (V/V) in both discharge and charge processes. Consequently, the successful PANI coating into the sodium superionic conductor framework improved the sodium diffusion channels with a measurable increase of diffusion coefficients with cycling (ca. 3.25 × 10 cm s). Therefore, PANI@NVPF nanocomposites are promising cathode candidates for high-rate sodium-ion battery applications.
Download full-text PDF |
Source |
|---|---|
| http://dx.doi.org/10.1021/acsami.4c05832 | DOI Listing |
Publication Analysis
Top Keywords
Similar Publications
Synergistically Boosted Na Migration and Deep Desodiation Stability of NASICON Cathode via High Entropy Regulation.
Small
January 2025
College of Materials Science and Engineering, Hunan University, Changsha, 410082, China.
Mn-containing sodium superionic conductor (NASICON) compounds have shown considerable potential as cathode for sodium-ion batteries (SIBs) owing to higher working voltage (V/V: 3.9 V), lower cost, and lower toxicity compared to full vanadium-based NASICON NaV(PO). Taking NaVMn(PO) (NVMP) as an example, its practical application is still restricted by poor electronic conductivity, sluggish intrinsic Na diffusion, and poor high-voltage stability.
View Article and Find Full Text PDFRapid and reversible sodium-ion cathode materials for NASICON NaMnTiPBO achieved through Boron-substitution.
J Colloid Interface Sci
December 2024
School of Materials Science and Engineering, State Key Lab of Silicon and Advanced, Semiconductor Materials, Zhejiang University, Hangzhou 310027, PR China. Electronic address:
NaMnTi(PO) is a promising sodium-ion cathode material due to its relatively high specific capacity, excellent thermodynamic stability and low cost. However, unfavorable electron conductivity and slow kinetics limit its practical application. Here, a strategy of hetero and multivalent anion substitution is proposed to achieve high-rate performance and good capacity retention.
View Article and Find Full Text PDFData-Driven Theoretical Design of Anion Cluster-Based Sodium Antiperovskite Superionic Conductors.
ACS Appl Mater Interfaces
December 2024
University of Michigan─Shanghai Jiao Tong University Joint Institute, Shanghai Jiao Tong University, Shanghai 200240, China.
Sodium antiperovskite materials (APs) are a promising class of solid-state electrolytes owing to their high structural tolerance and good formability. However, few APs have been synthesized experimentally, indicating the necessity of exploring potential chemical spaces with higher ionic conductivities. Herein, through a combined particle swarm optimization algorithm, high-throughput first-principles calculations, ab initio molecular dynamics, and long time-scale machine-learning molecular dynamics simulations, strategies based on site-exchanging and anion clusters are shown to simultaneously enhance the thermal stability and sodium diffusivity in the designed APs.
View Article and Find Full Text PDFNa Vacancy-Driven Phase Transformation and Fast Ion Conduction in W-Doped NaSbS from Machine Learning Force Fields.
Chem Mater
October 2024
Department of Materials, Imperial College London, Exhibition Road, London SW7 2AZ, U.K.
Solid-state sodium batteries require effective electrolytes that conduct at room temperature. The NaPnCh (Pn = P, Sb; Ch = S, Se) family has been studied for their high Na ion conductivity. The population of Na vacancies, which mediate ion diffusion in these materials, can be enhanced through aliovalent doping on the pnictogen site.
View Article and Find Full Text PDFElectronic Confinement-Restrained Anti-Site Defects in Sodium-Rich Phosphates Toward Multi-Electron Transfer and High Energy Efficiency.
Adv Mater
November 2024
MOE Key Laboratory for UV Light-Emitting Materials and Technology, Northeast Normal University, Changchun, Jilin, 130024, P. R. China.
Article Synopsis
- Sodium super-ionic conductor NaMnTi(PO) (NMTP) cathodes are promising due to their affordability and high voltages but suffer from voltage hysteresis caused by anti-site defects from manganese occupying sodium vacancies, leading to poor energy efficiency.
- This study introduces a method involving partial replacement of titanium with vanadium to enhance electronic interactions that prevent manganese migration and decrease defect formation, ultimately improving energy efficiency.
- The resultant Na-rich NaMnTiV(PO) (NMTVP) material exhibited impressive performance with a capacity of 182.7 mAh/g and energy output of 513.8 Wh/kg, representing a 35.5% increase in energy efficiency, providing new insights for developing better Na-ion battery
Want 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!