2026-10-06T13:24:24Z https://www.scidb.cn/oai

10.57760/sciencedb.0138c 2026-09-28T10:25:39Z

2026-09-28 Surface-Anchored CoSn/Sn@NC Enabling Dual-Scale Spatial Confinement for Boosted Kinetics and Durable SiO Anodes doi:10.57760/sciencedb.0138c en SiO is a promising anode candidate for next-generation lithium-ion batteries, yet its commercialization is impeded by intrinsically sluggish charge transport and severe particle pulverization induced by substantial volume fluctuations. Herein, we report a dual-scale confinement paradigm featuring surface-anchored CoSn/Sn alloys encapsulated in nitrogen-doped carbon (CoSn/Sn@NC), synthesized via the in-situ growth of CoSn-based metal-organic frameworks (MOFs) on SiO surfaces followed by high-temperature pyrolysis. In this architecture, CoSn/Sn nanocrystals are nanoscale-confined within robust MOF-derived NC cages to prevent agglomeration and preserve electrical conductivity, while the resulting CoSn/Sn@NC units are firmly anchored onto macroscopic SiO particles. In this dual-scale design, the anchored NC cages serve as surface buffers for mechanical stress redistribution and volumetric strain accommodation, while the CoSn/Sn@NC units provide conductive bridges for accelerated electron/Li+ transport. Benefiting from this dual-scale architecture, the optimized electrode exhibits a high reversible capacity of 1348.55 mAh g-1 at 0.1 A g-1, a superior rate capability (615.51 mAh g-1 at 5 A g-1), and excellent long-term cycling stability with a capacity retention of 817.87 mAh g-1 after 800 cycles at 0.5 A g-1. This general strategy, leveraging the synergy of surface anchoring and nanoscale confinement, offers a powerful solution to the capacity-kinetics dilemma in high-capacity anodes, holding great promise for practical high-energy battery applications. SiOx-based anode; metal-organic framework; spatial confinement; lithium-ion battery Shi kai Kashif Masood Muhammad Yang fanfan Xu hao Ziwei Chen Yang Keli Chen jun Liu xin Jiaoyu Peng Tanveer Ahmed Hu peng PUBLIC https://creativecommons.org/licenses/by-nc-nd/4.0/ dataset Science Data Bank