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Sn/Ti Co-Substitution Boosting NASICON-Type Symmetric Cell With Enhanced Electrochemical Performance.

Yang Li¹, Yongli Wang^2,3,4,5, Zechen Li¹

¹Beijing Key Laboratory of Construction Tailorable Advanced Functional Materials and Green Applications, School of Materials Science and Engineering, Beijing Institute of Technology, Beijing, PR China.

Chemistry (Weinheim an Der Bergstrasse, Germany)

|May 26, 2026

Summary

This study introduces a new manganese-based material (NMTSP) for high-energy sodium-ion batteries (SIBs). The novel NMTSP material demonstrates excellent performance in both cathode and anode applications, paving the way for advanced SIBs.

Keywords:

NASICON‐structure co‐substitution high energy density sodium‐ion batteries symmetric cell

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Area of Science:

Materials Science
Electrochemistry
Energy Storage

Background:

Growing industrial demand for high-energy density sodium-ion batteries (SIBs).
Need for novel electrode materials with improved electrochemical performance.

Purpose of the Study:

Design and synthesize a novel manganese-based NASICON-structure material, Na3MnTi0.5Sn0.5(PO4)3 (NMTSP).
Evaluate NMTSP as both a cathode and anode material for SIBs.
Construct and assess an NMTSP||NMTSP symmetric full-cell for high-performance SIB applications.

Main Methods:

Synthesis of Na3MnTi0.5Sn0.5(PO4)3 (NMTSP) with NASICON structure.
Electrochemical evaluation of NMTSP as a cathode material, utilizing Mn redox reactions.
Electrochemical evaluation of NMTSP as an anode material, leveraging Sn-rich properties.
Construction and testing of an NMTSP||NMTSP symmetric full-cell.

Main Results:

NMTSP cathode exhibits a reversible specific capacity of 137.4 mAh g⁻¹.
NMTSP anode shows a reversible capacity of 219.0 mAh g⁻¹ with 99.4 mAh g⁻¹ retained at 571 mA g⁻¹.
NMTSP||NMTSP symmetric full-cell achieves an operating voltage of 1.48 V, energy density of 134.5 Wh kg⁻¹, and retains 76.0% capacity after 100 cycles.

Conclusions:

Ti/Sn co-substitution is an effective strategy for tuning the electrochemical behavior of Mn-based NASICON electrodes.
NMTSP demonstrates significant potential for application in high-performance symmetric sodium-ion batteries.