Tin oxide nanoparticles (SnO
2 NPs) have been encapsulated in situ in a three‐dimensional ordered space structure. Within this composite, ordered mesoporous carbon (OMC) acts as a carbon framework showing a desirable ordered mesoporous structure with an average pore size (≈6 nm) and a high surface area (470.3 m
2 g
?1), and the SnO
2 NPs (≈10 nm) are highly loaded (up to 80 wt %) and homogeneously distributed within the OMC matrix. As an anode material for lithium‐ion batteries, a SnO
2@OMC composite material can deliver an initial charge capacity of 943 mAh g
?1 and retain 68.9 % of the initial capacity after 50 cycles at a current density of 50 mA g
?1, even exhibit a capacity of 503 mA h g
?1 after 100 cycles at 160 mA g
?1. In situ encapsulation of the SnO
2 NPs within an OMC framework contributes to a higher capacity and a better cycling stability and rate capability in comparison with bare OMC and OMC ex situ loaded with SnO
2 particles (SnO
2/OMC). The significantly improved electrochemical performance of the SnO
2@OMC composite can be attributed to the multifunctional OMC matrix, which can facilitate electrolyte infiltration, accelerate charge transfer, and lithium‐ion diffusion, and act as a favorable buffer to release reaction strains for lithiation/delithiation of the SnO
2 NPs.
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