Abstract Lithium-ion batteries have progressively taken the place of conventional power sources and been extensively employed in our daily lives. In this study, a simple hydrothermal method was adopted to develop the two-dimensional layered MoSe2 into three-dimensional porous microspheres and nanosphere structures hydrangea-like via directional polymerization, self-assembly and Ostwald maturation. Subsequently, the dopamine hydrochloride was polymerized and carbonized to modify the curd-shaped MoSe2 by N-doped carbon coating. The modified MoSe2@N-C anode material exhibited a larger specific capacity, better stability and a higher rate at high current density than MoSe2 anode material. The modified negative electrode material achieved the specific capacity of 553 mAh/g at a current density of 1 A/g and 300.8 mAh/g at 10 A/g. Under high current density, the long-cycle charge-discharge performance test was performed, and the modified material exhibited a significantly large specific capacity and high stability performance. Its electrochemical performance was enhanced due to the N-doped carbon coating layer on the surface that increased the material conductivity and reduced the shuttle effect of polyselenide.

中文翻译：

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用于高性能锂离子电池的三维状绣球花MoSe2@N掺杂碳负极材料的水热合成

摘要 锂离子电池已逐步取代传统电源并广泛应用于我们的日常生活中。本研究采用简单的水热法，通过定向聚合、自组装和 Ostwald 成熟，将二维层状 MoSe2 开发成三维多孔微球和类似绣球花的纳米球结构。随后，将多巴胺盐酸盐聚合和碳化，通过 N 掺杂的碳涂层对凝乳状的 MoSe2 进行改性。改性MoSe2@NC负极材料比MoSe2负极材料表现出更大的比容量、更好的稳定性和更高的高电流密度倍率。改性负极材料在1 A/g电流密度下比容量达到553 mAh/g，在10 A/g电流密度下比容量达到300.8 mAh/g。在高电流密度下进行了长循环充放电性能测试，改性材料表现出明显的大比容量和高稳定性能。由于表面的N掺杂碳涂层增加了材料的导电性并降低了聚硒化物的穿梭效应，因此其电化学性能得到了增强。