Lithium ruthenium oxide (Li₂RuO₃) is an archetypal lithium rich cathode material (LRCM) with both cation and anion redox reactions (ARRs). Commonly, the instability of oxygen redox activities has been regarded as the root cause of its performance degradation in long-term operation. However, we find that not triggering ARRs does not improve and even worsens its cyclability due to the detrimental strain accumulation induced by Ru redox activities. To solve this problem, we demonstrate that F-doping in Li₂RuO₃ can alter its preferential orientation and buffer interlayer repulsion upon Ru redox, both of which can mitigate the strain accumulation along the c-axis and improve its structural stability. This work highlights the importance of optimizing cation redox reactions in LRCMs and provides a new perspective for their rational design.

中文翻译：

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通过氟掺杂减轻 Li2RuO3 中的应变积累


锂钌氧化物 (Li ₂ RuO ₃ ) 是一种典型的富锂正极材料 (LRCM)，具有阳离子和阴离子氧化还原反应 (ARR)。通常，氧氧化还原活性的不稳定被认为是其长期运行性能下降的根本原因。然而，我们发现，由于Ru氧化还原活性引起的有害应变积累，不触发ARR并不能改善甚至恶化其循环性能。为了解决这个问题，我们证明Li ₂ RuO ₃ 中的F掺杂可以改变其择优取向并缓冲Ru氧化还原时的层间排斥，这两者都可以减轻沿着c轴并提高其结构稳定性。这项工作强调了优化 LRCM 中阳离子氧化还原反应的重要性，并为其合理设计提供了新的视角。