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Updated: Aug 5, 2026

Characterization of Electrode Materials for Lithium Ion and Sodium Ion Batteries Using Synchrotron Radiation Techniques
Published on: November 11, 2013
Enhancing Mn(II)/Mn(IV) Redox Activity and Reducing Polarization of NASICON-Type Na3MnTi(PO4)3 Through Al-Doping
Mengyao Wang1, Hao Fan1, Ping Hu2
1State Key Laboratory of Advanced Technology for Materials Synthesis and Processing, Wuhan University of Technology, Wuhan, P. R. China.
Abstract:
NASICON-type cathode materials have garnered significant interest for their stable structure and favorable Na+ diffusion pathways. However, Na3MnTi(PO4)3 (NMTP) often suffers from substantial voltage hysteresis and limited capacity, primarily attributed to intrinsic anti-site defects. To address this challenge, we propose an Al-doping strategy to simultaneously reduce the polarization and enhance the electrochemical activity. A series of Na3+ xMnTi1- xAlx(PO4)3 (x = 0, 0.05, 0.1) compounds are synthesized, with Na3.05MnTi0.95Al0.05(PO4)3 (NMTAP-0.05) demonstrating an optimal specific capacity and ideal cyclability. In situ XRD reveals the coexistence of solid-solution and biphasic reactions, while ex situ XAS analyses confirm highly reversible Mn2+/Mn4+ redox behavior. When paired with hard carbon (HC) in full-cell, NMTAP-0.05//HC delivers a high capacity, highlighting its practical potential. This work provides new insights into designing high-performance phosphate-based cathodes for sodium-ion batteries.
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