Abstract Molybdenum selenide has attracted considerable attention for sodium-ion batteries (SIBs) due to its excellent reactivity and large capacity compared to other transition metal dichalcogenides (TMDs). Herein, a facile template-free hydrothermal process is conducted to synthesize hierarchical MoSe2 hollow microspheres with the diameters of ~1.5 μm. The as-prepared MoSe2 hollow microspheres consist of cross-linked nanosheets. As an anode of SIBs, the hierarchical MoSe2 hollow microspheres exhibit a high initial discharge capacity of 710.2 mAh g−1. When the current density is as high as 1000 mA g−1, the specific capacity can still maintain at 290 mAh g−1. The excellent cycling performance and rate capability are due to the hollow microspherical architecture, which shortens the diffusion length of Na+, promotes the penetration of electrolyte into active materials and accommodates the volume stress. It is a successful case to obtain hollow architectures to shed some lights on the high-performance SIBs.

中文翻译：

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分层MoSe2空心微球的可控生长以增强钠储存

摘要 硒化钼与其他过渡金属二硫属化物（TMDs）相比，由于其优异的反应活性和大容量，在钠离子电池（SIBs）领域引起了广泛关注。在此，进行了一种简便的无模板水热工艺以合成直径约为 1.5 μm 的分层 MoSe2 空心微球。所制备的 MoSe2 空心微球由交联的纳米片组成。作为SIBs的阳极，分层MoSe2空心微球表现出710.2 mAh g-1的高初始放电容量。当电流密度高达1000 mA g-1时，比容量仍可维持在290 mAh g-1。优异的循环性能和倍率性能归功于中空微球结构，缩短了 Na+ 的扩散长度，促进电解质渗透到活性材料中并适应体积应力。获得空心架构来阐明高性能 SIB 是一个成功的案例。