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High-Power and Long-Lifetime Na-Ion Batteries Enabled by High-Loading Vanadium-Based Phosphate Heterostructure

Yuqiang Pi¹, Miaomiao Ma¹, Qi Zhang¹

¹School of Chemistry and Materials Science, Hubei Engineering University, Hubei, Xiaogan 432000, China.

ACS Applied Materials & Interfaces

|January 12, 2026

Summary

A novel vanadium-based phosphate heterostructure cathode material (N8VPP) was synthesized for sodium-ion batteries (NIBs). This material demonstrates excellent capacity, cycling stability, and power capability, crucial for large-scale energy storage.

Keywords:

Na-ion full battery energy barrier heterostructure cathode high-loading long-lifespan

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Area of Science:

Materials Science
Electrochemistry
Energy Storage

Background:

High-loading electrodes are essential for practical sodium-ion battery (NIB) applications in large-scale energy storage.
Developing cathode materials with rapid sodium-ion diffusion and structural stability is key for high-power, long-lifetime NIBs.

Purpose of the Study:

To synthesize and characterize a novel vanadium-based phosphate heterostructure cathode material for NIBs.
To investigate the electrochemical performance, including capacity, rate capability, and cycling stability, of the synthesized material under high-loading conditions.

Main Methods:

Synthesis of Na8V5(P2O7)2.925(PO4)3.75 (N8VPP) via spray-drying, creating a dual-phase heterostructure.
Electrochemical characterization including galvanostatic cycling and rate performance testing.
Density Functional Theory (DFT) calculations to understand Na+ migration energy barriers and charge transfer.

Main Results:

The N8VPP cathode exhibits a dual-phase heterostructure (Na7V4(P2O7)4(PO4) and Na3V2(PO4)3) enhancing electronic states near the Fermi level.
High-loading electrodes (10 mg cm-2) delivered capacities of 90.51 mAh g-1 at 0.1 A g-1 and 41.88 mAh g-1 at 10 A g-1.
Exceptional cycling stability with 71.8% retention (64.3 mAh g-1) after 1000 cycles at 2 A g-1, and a full battery demonstrated 73 mAh g-1 at 5 A g-1 with 3000 cycles at 2 A g-1.

Conclusions:

The P2O7(4-)/PO4(3-) polyanionic hybrid heterostructure effectively lowers Na+ migration barriers and promotes charge transfer.
The synthesized N8VPP material shows significant promise for high-performance, long-lifetime NIBs, especially under high-loading conditions.
This work provides valuable design principles for developing advanced NIB cathode materials for practical energy storage solutions.