Abstract MnO is considered one of the most promising anode materials, but how to design and improve its structure is still of importance. In this paper, novel composites structure of carbon coated MnO anchored on reduced graphene oxides sheets (C@MRGO) are fabricated by a two-step hydrothermal and following heat treatment process. The prepared C@MRGO exhibits a superior performance of 1178, and 665 mAh g −1 at 100 and 1000 mA g −1 , respectively. Comparison study finds that this novel structure greatly improved the conversion reaction and adsorption capacity of MnO particles. Further study shows that two different carbons both promote the lithium storage process from a different perspective. Typically, graphene greatly improves conductivity and controls the crystallization and growth of MnO particles, while carbon coating could provide a good elastic restricted body to effectively keep the integrity of the SEI film, inhibited volume expansion and make the conversion reaction reversible. In addition, carbon coating adsorbs much Li + to achieve higher capacity, due to the nature adsorption properties of carbon materials. The design of using different carbon to enhance MnO electrode is believed to bring inspiration to the structural construction in other transitional metal oxide systems for superior performance of energy storage.

中文翻译：

---

双碳改性MnO电极设计改善锂离子电池吸附转化反应

摘要 MnO 被认为是最有前途的负极材料之一，但如何设计和改进其结构仍具有重要意义。在本文中，通过两步水热和后续热处理工艺制造了锚定在还原氧化石墨烯片（C@MRGO）上的碳包覆MnO的新型复合材料结构。制备的 C@MRGO 在 100 和 1000 mA g -1 下分别表现出 1178 和 665 mAh g -1 的优异性能。对比研究发现，这种新型结构大大提高了MnO颗粒的转化反应和吸附能力。进一步的研究表明，两种不同的碳都从不同的角度促进了锂的存储过程。通常，石墨烯极大地提高了导电性并控制了 MnO 颗粒的结晶和生长，而碳涂层可以提供良好的弹性限制体，有效保持SEI膜的完整性，抑制体积膨胀并使转化反应可逆。此外，由于碳材料的天然吸附特性，碳涂层吸附了大量的 Li + 以实现更高的容量。使用不同的碳来增强MnO电极的设计被认为为其他过渡金属氧化物系统的结构构建带来了灵感，以实现卓越的储能性能。