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超大离子替代剂可有效抵抗Jahn-Teller效应,从而提升高性能Mn基P2-NaO2 ...
钠离子电池正极材料P2-Na0.67Ni0.33Mn0.67O2(NNMO)通过钡掺杂抑制P2→O2相变和颗粒开裂,提升循环稳定性。研究采用原位XRD、DRT及ex-situ XPS、HRTEM分析,结合DFT计算表明Ba2+占据Ni位扩大层间距(0.5574→0.5667 nm),补偿Mn3+电荷降低Jahn-Teller效应,优化离子扩散和电子传导。
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