Despite its high theoretical capacity, the practical application of MnO₂ anodes for lithium‐ion batteries is still hindered by poor rate capability, owing to its low electronic conductivity and large volume variation during Li⁺ insertion/extraction. Herein, these tough issues are tackled by embedding MnO₂ ultrafine nanoparticles within polydopamine‐modified reduced graphene oxide. This smart design skillfully utilizes the reduction and self‐polymerization properties of dopamine to reduce graphene oxide while MnO₂ ultrafine nanoparticles are embedded in the polydopamine and form a stable interface. The polydopamine, acting as an elastomer, can cushion the stress associated with the expansion of MnO₂ ultrafine nanoparticles, and the reduced graphene oxide, as the highly conductive matrix, can greatly improve the rate performance. The resultant composites exhibit a high reversible capacity, excellent cycling stability, and good rate performance, owing to the synergistic effects among conductive graphene, elastic polydopamine, and ultrafine MnO₂.

中文翻译：

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将MnO2超细纳米粒子嵌入石墨烯基混合弹性体中，作为增强锂存储的阳极

尽管它的高理论容量，MnO的实际应用₂的阳极的锂离子电池仍然由速率能力差受阻，由于锂在其低的电子传导率和较大的体积变化⁺插入/取出。在这里，这些难题是通过将MnO ₂超细纳米颗粒嵌入聚多巴胺改性的还原氧化石墨烯中来解决的。这种巧妙的设计巧妙地利用了多巴胺的还原和自聚合特性来还原氧化石墨烯，而MnO ₂超细纳米颗粒被嵌入聚多巴胺中并形成稳定的界面。聚多巴胺作为弹性体，可以缓和与MnO ₂膨胀相关的应力超细纳米颗粒和还原的氧化石墨烯作为高导电性基质，可以大大提高倍率性能。由于导电石墨烯，弹性聚多巴胺和超细MnO ₂之间的协同作用，所得复合材料具有较高的可逆容量，出色的循环稳定性和良好的倍率性能。