Li incorporation induces synergistic biphasic evolution in layered oxide cathodes for sodium storage
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Updated: Nov 8, 2026

Characterization of Electrode Materials for Lithium Ion and Sodium Ion Batteries Using Synchrotron Radiation Techniques
Published on: November 11, 2013
Shenggui Wang1,2, Xiaoxia Yang3,4, Yuankui Wang2
1School of Materials Science and Engineering, Central South University, Changsha, 410083, China. yukun2010@csu.edu.cn.
Abstract:
Layered oxide cathodes for sodium-ion batteries (SIBs) feature abundant sodium storage, facile processing, and high electrochemical activity, but complex phase transitions and transition metal migration hinder their application. Here, Li incorporation is adopted to construct biphasic Na0.72Li0.20Ni0.22Mn0.66O2 (NLNMO). The 20 at% Li doping facilitates O3-phase generation, affords extra Na⁺ diffusion channels and accelerates ionic transport. In situ sXRD confirms suppressed phase transitions for improved structural stability, and XAS verifies elevated Mn valence to inhibit Mn dissolution. As a result, the NLNMO cathode delivers 153 mAh g-1 at 0.1C, 86% capacity retention over 100 cycles at 2C and 89 mAh g-1 at 10C. This work underscores the promise of biphasic structural design in addressing the drawbacks of single-phase cathodes.
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