Space-confined twin-polymerization enabling homogeneous integration of ultrafine TiO 2 nanoparticles into a sulfur-doped carbon matrix for boosting lithium storage.

Homogeneous integration of ultrafine TiO 2 nanoparticles into a conductive sulfur-doped carbon skeleton was readily crafted by unusual space-confined twin-polymerization of a titanium-containing single-source coupled monomer and subsequent carbonization, producing a robust hetero-architecture for boosting lithium storage with large reversible capacity, high rate capability, and long-term cycling stability.