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Benefits of Chromium Substitution in Na3V2(PO4)3 as a Potential Candidate for Sodium‐Ion Batteries

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TLDR
In this article, the effect of low-level chromium substitution in Na3V2-xCrx(PO4)3 (0≤x≤0.4), a potential cathode material in Na-ion cells, has been examined.
Abstract
The effect of low-level chromium substitution in Na3V2-xCrx(PO4)3 (0≤x≤0.4), a potential cathode material in Na-ion cells, has been examined. A suitable synthesis procedure is developed to obtain composites of crystalline NASICON phosphate and an amorphous carbon phase to enhance the electrical conductivity of the electrode. The optimized cathode materials were characterized by using X-ray diffraction and spectroscopic techniques. The electrochemical evaluation was carried out by using galvanostatic and potentiostatic methods. The activity of the V5+/V4+ redox couple at approximately 4 V is remarkable for the samples containing chromium. A reversible capacity of 107 mAh g−1 with a coulombic efficiency of 99 % was determined for Na3V1.9Cr0.1(PO4)3 after 40 cycles. The observed performance correlates with a good kinetic response, resulting from low charge-transfer resistance and high diffusion coefficient.

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Journal ArticleDOI

Routes to High Energy Cathodes of Sodium-Ion Batteries

TL;DR: In this article, a brief review on the recent developments of SIB cathodes is presented, with a focus on low cost and high energy density materials (> 450 Wh kg−1 vs Na) together with discussion of their Na-storage mechanisms.
Journal ArticleDOI

Polyanion-Type Electrode Materials for Sodium-Ion Batteries.

TL;DR: A brief review of the research progress of polyanion‐type electrode materials for Na‐ion batteries is presented, summarizing recent accomplishments, highlighting emerging strategies, and discussing the remaining challenges of such systems.
Journal ArticleDOI

Polyanion-type cathode materials for sodium-ion batteries

TL;DR: This review summarizes the recent progress of polyanion-type materials for SIBs, which include phosphates, fluorophosphate, pyrophosphates, mixed phosphate, sulfates, and silicates, and discusses the remaining challenges and corresponding strategies for polyanionic materials.
Journal ArticleDOI

Phosphate Framework Electrode Materials for Sodium Ion Batteries.

TL;DR: The detailed and comprehensive understanding of structure–composition–performance relationship of materials is provided and the advantages and disadvantages of the materials for use in SIBs are shown.
Journal ArticleDOI

Challenges in Developing Electrodes, Electrolytes, and Diagnostics Tools to Understand and Advance Sodium-Ion Batteries

TL;DR: In this paper, a review mainly focuses on the challenging problems for the attractive battery materials (i.e., cathode, anode, and electrolytes) and summarizes the latest strategies to improve their electrochemical performance as well as presenting recent progress in operando diagnostics to disclose the physics behind the electrochemical performances and to provide guidance and approaches to design and synthesize advanced battery materials.
References
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Journal ArticleDOI

Na-ion batteries, recent advances and present challenges to become low cost energy storage systems

TL;DR: In this paper, a review of Na-ion battery materials is presented, with the aim of providing a wide view of the systems that have already been explored and a starting point for the new research on this battery technology.
Journal ArticleDOI

Room-temperature stationary sodium-ion batteries for large-scale electric energy storage

TL;DR: In this paper, a variety of electrode materials including cathodes and anodes as well as electrolytes for room-temperature stationary sodium-ion batteries are briefly reviewed and compared the difference in storage behavior between Na and Li in their analogous electrodes and summarize the sodium storage mechanisms in available electrode materials.
Journal ArticleDOI

Sodium and sodium-ion energy storage batteries

TL;DR: In this article, the challenges of current high-temperature sodium technologies including Na-S and Na-NiCl2 and new molten sodium technology, Na-O2 are summarized.
Journal ArticleDOI

Voltage, stability and diffusion barrier differences between sodium-ion and lithium-ion intercalation materials

TL;DR: In this paper, the difference between Na-ion and Li-ion based intercalation chemistries in terms of three key battery properties, voltage, phase stability and diffusion barriers was compared.

Voltage, Stability and Diffusion Barrier Differences between Sodium-ion and Lithium-ion intercalation Materials

Abstract: To evaluate the potential of Na-ion batteries, we contrast in this work the difference between Na-ion and Li-ion based intercalation chemistries in terms of three key battery properties—voltage, phase stability and diffusion barriers. The compounds investigated comprise the layered AMO2 and AMS2 structures, the olivine and maricite AMPO4 structures, and the NASICON A3V2(PO4)3 structures. The calculated Na voltages for the compounds investigated are 0.18–0.57 V lower than that of the corresponding Li voltages, in agreement with previous experimental data. We believe the observed lower voltages for Na compounds are predominantly a cathodic effect related to the much smaller energy gain from inserting Na into the host structure compared to inserting Li. We also found a relatively strong dependence of battery properties on structural features. In general, the difference between the Na and Li voltage of the same structure, DVNa–Li, is less negative for the maricite structures preferred by Na, and more negative for the olivine structures preferred by Li. The layered compounds have the most negative DVNa–Li. In terms of phase stability, we found that open structures, such as the layered and NASICON structures, that are better able to accommodate the larger Na+ ion generally have both Na and Li versions of the same compound. For the close-packed AMPO4 structures, our results show that Na generally prefers the maricite structure, while Li prefers the olivine structure, in agreement with previous experimental work. We also found surprising evidence that the barriers for Na+ migration can potentially be lower than that for Li+ migration in the layered structures. Overall, our findings indicate that Na-ion systems can be competitive with Li-ion systems.
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