北京科技大学陈骏课题组提出了一种抗姜泰勒畸变的固有畸变，用于高稳定性钠离子插层富锰氧化物阴极。相关论文于2025年2月5日发表于国际顶尖学术期刊《德国应用化学》杂志上。

在该研究中，小组揭示了“抗姜泰勒畸变”的“固有畸变”。有效稳定层状富锰氧化物（LMRO）阴极层状框架的机制。通过先进的同步X射线技术、原子尺度成像表征和理论计算，研究者系统地证实了通过引入大块氧空位构建的本征畸变，该本征畸变可以抵消由于其相反的变形方向而导致的循环过程中的J-T畸变。这大大降低和均匀了材料ab面内和c轴的晶格应变，从而减轻了P2-P'2相变，并抑制了反复循环后的边缘位错和晶内裂纹的形成。

因此，定制的具有固有畸变的P2-Na_0.72Mg_0.1Mn_0.9O₂阴极在不牺牲Mn³⁺/Mn⁴⁺氧化还原容量（0.3℃时186.5 mAh g^-1）的情况下，提供了显着增强的循环耐久性（500次循环后91.9%的容量保留）。这种固有畸变工程为实现电网规模钠离子电池（SIB）的高性能LMRO阴极，铺平了一条全新的、有前景的途径。

研究人员表示，层状富锰氧化物由于其高比容量和成本效益，被广泛认为是电网规模钠离子电池的主要阴极候选材料，但众所周知的Mn³⁺的Jahn-Teller （J-T）畸变总是导致，严重的结构退化和随后的快速阴极失效，阻碍了这种材料的实际实施。

附：英文原文

Title: Intrinsic Distortion Against Jahn-Teller Distortion: A New Paradigm for High-Stability Na-Ion Layered Mn-Rich Oxide Cathodes

Author: Junteng Jin, Yao Wang, Xudong Zhao, Yang Hu, Tianyu Li, Hui Liu, Yi Zhong, Lifang Jiao, Yongchang Liu, Jun Chen

Issue&Volume: 2025-02-05

Abstract: Layered manganese-rich oxides (LMROs) are widely recognized as the leading cathode candidates for grid-scale sodium-ion batteries (SIBs) owing to their high specific capacities and cost benefits, but the notorious Jahn-Teller (J-T) distortion of Mn3+ always induces severe structural degradation and consequent rapid cathode failure, impeding the practical implementation of such materials. Herein, we unveil the "intrinsic distortion against J-T distortion" mechanism to effectively stabilize the layered frameworks of LMRO cathodes. The intrinsic distortion simply constructed by introducing bulk oxygen vacancies is systematically confirmed by advanced synchrotron X-ray techniques, atomic-scale imaging characterizations, and theoretical computations, which can counteract the J-T distortion during cycling due to their opposite deformation orientations. This greatly decreases and uniformizes the lattice strain within the ab plane and along the c axis of the material, thereby alleviating the P2-P'2 phase transition as well as suppressing the edge dislocation and intragranular crack formation upon repeated cycles. As a result, the tailored P2-Na0.72Mg0.1Mn0.9O2 cathode featuring intrinsic distortion delivers a considerably enhanced cycling durability (91.9% capacity retention after 500 cycles) without sacrificing the Mn3+/Mn4+ redox capacity (186.5 mAh g-1 at 0.3 C). This intrinsic distortion engineering paves a brand-new and prospective avenue toward achieving high-performance LMRO cathodes for SIBs.

DOI: 10.1002/anie.202423728

Source: https://onlinelibrary.wiley.com/doi/10.1002/anie.202423728