To meet the ever-increasing demand for energy storage in social development, high energy density battery materials are required. Herein, we successfully designed a novel hollow SiO₂-PMo₁₂@rGO nanosphere via electrostatic interaction (PMo₁₂ is H₃PMo₁₂O₄₀; rGO is reduced graphene oxide). The PMo₁₂ clusters were electrostatically attached onto the surface of the hollow SiO₂ spheres with amino terminals, and the rGO layer was further externally wrapped on the composites to confine the POM clusters. The hollow SiO₂-PMo₁₂@rGO nanocomposite was used as an anode material for lithium-ion batteries (LIBs). It showed an overall reversible capacity of 720 mA h g⁻¹ for 100 cycles at a current density of 100 mA g⁻¹, which was twice as large as that of the hollow SiO₂@rGO and SiO₂-PMo₁₂ composites. The hollow structure of the composites provided abundant void space to buffer the volume changes during the lithiation and delithiation processes. Confinement of PMo₁₂ with the rGO layer prevented the POM clusters from dissolution in the electrolyte, improved the migration of Li⁺ and enhanced the conductivity of the entire material. The superior performance of the hollow SiO₂-PMo₁₂@rGO nanosphere mainly resulted from the synergistic effects from the three components.

中文翻译：

---

将PMo12限制在中空SiO2-PMo12 @ rGO纳米球中以实现高性能锂存储

为了满足社会发展中对能量存储的不断增长的需求，需要高能量密度的电池材料。本文中，我们通过静电相互作用成功地设计了一种新型的空心SiO ₂ -PMo ₁₂ @rGO纳米球（PMo ₁₂为H ₃ PMo ₁₂ O ₄₀； rGO为氧化石墨烯）。将PMo ₁₂团簇静电连接到带有氨基末端的中空SiO ₂球的表面上，并将rGO层进一步外部包裹在复合材料上，以限制POM团簇。空心SiO ₂ -PMo ₁₂rGO纳米复合材料被用作锂离子电池（LIB）的负极材料。它显示了在100 mA g ^-1的电流密度下，在100个循环中的总可逆容量为720 mA hg ^-1，是中空SiO ₂ @rGO和SiO ₂ -PMo ₁₂复合材料的两倍。复合材料的中空结构提供了充足的空隙空间，以缓冲锂化和脱锂过程中的体积变化。用rGO层限制PMo ₁₂可以防止POM团簇溶解在电解质中，改善Li ⁺的迁移并增强整个材料的电导率。中空SiO ₂的卓越性能-PMo ₁₂ @rGO纳米球主要是由于这三个成分的协同作用。