Li‐rich Mn‐based cathode materials exhibit a remarkable reversible specific capacity exceeding 250 mAh g−1, positioning them as the preferred choice for the next generation of high‐energy density lithium‐ion battery cathode materials. However, their inferior rate and cycling performance pose significant challenges. In this context, a Li‐rich material incorporating an expanded fast Li‐ion diffusion network has been successfully synthesized. This advancement involves the introduction of a single‐layer of LiCo(Ni)O2 with high Li‐ion diffusion coefficients into the crystal structure of Li‐rich cathode, thereby enhancing the rate performance, achieving an impressive capacity of 212 mAh g−1 at 5 C. Furthermore, the single‐layer LiCo(Ni)O2 can effectively isolates Li2MnO3 phase domains, thereby enhancing the structural stability during the anion redox process, consequently extending the electrochemical stability limits. Operating within a voltage range of 2.1–4.6 V, the capacity retention reaches 80% after 400 cycles, with a voltage decay of merely 0.74 mV per cycle. This innovative utilization of an expanded fast Li‐ion diffusion network provides invaluable insights that will guide the development of strategies aimed at unlocking rate capability in layered oxide cathode materials.

中文翻译：

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通过单层 LiCo（Ni）O2 偏析的富锂锰基氧化物的可扩展快速锂离子扩散网络


富锂锰基正极材料表现出超过 250 mAh g-1 的显着可逆比容量，使其成为下一代高能量密度锂离子电池正极材料的首选。然而，它们较差的速率和骑行性能带来了重大挑战。在此背景下，已成功合成一种包含扩展快速锂离子扩散网络的富锂材料。这一进步涉及将具有高锂离子扩散系数的单层 LiCo（Ni）O2 引入富锂阴极的晶体结构中，从而提高倍率性能，在 5 C 时实现令人印象深刻的 212 mAh g-1 容量。此外，单层 LiCo（Ni）O2 可以有效分离 Li2MnO3 相域，从而增强阴离子氧化还原过程中的结构稳定性，从而扩展电化学稳定性极限。在 2.1–4.6 V 的电压范围内工作，400 次循环后容量保持率达到 80%，每个循环的电压衰减仅为 0.74 mV。这种对扩展的快速锂离子扩散网络的创新利用提供了宝贵的见解，将指导旨在释放层状氧化物正极材料速率能力的策略开发。