Rational Fabrication of Well-Defined Mesoporous Carbon-Supported TiO₂ Nanostructures for Anode Material of Lithium-Ion Batteries

Abstract

Well-defined mesoporous carbon-supported TiO 2 heterostructures, especially with a modulated TiO 2 crystalline phase and tunable physicochemical properties of carbon support, hold great potential for numerous advanced applications, but their rational fabrication remains challenging. In this work, a kind of pyrrole-containing bifunctional block copolymer (PEO-b-PPHMA) that can serve as both a structure-directing agent for the generation of mesostructures and a precursor for the formation of robust carbon materials was synthesized to fabricate such heterostructured materials. Based on the self-assembly of PEO-b-PPHMA and its chemical transformation in confined nanochannels, a strategy for the facile construction of diverse well-defined mesoporous TiO 2 with integrated carbon layer networks was developed by using a single block copolymer. Importantly, the generated carbon networks (supports) provide sufficient thermal stability to access highly crystalline TiO 2 skeletons and to modulate the TiO 2 crystalline phase without collapse of the preformed mesoporous structures. Moreover, not only the nitrogen content in the formed carbon layer is easily tunable by varying the treatment temperature but also the functional moieties such as plasmonic particles and redox sites can be flexibly incorporated into the formed carbon layer by employing different oxidative agents for pyrrole chemical transformation. These advantageous synthesis features enable facile and rational access to a series of well-defined mesoporous carbon-supported TiO 2 heterostructures with enhanced or new properties. As a demonstration, one mesoporous carbon-supported TiO 2 was prepared and used for lithium battery application, exhibiting excellent performance at the forefront of the relevant works in the literature. The obtained results indicate that our synthetic concept may offer new opportunities to develop novel TiO 2 nanomaterials for diverse applications.

Facile Synthesis of Pre-Lithiated LiTiO2 Nanoparticles for Quick Charge and Long Lifespan Anode in Lithium-Ion Batteries

“…Nowadays, considerable attention has been focused on development of clean and renewable energy for electric vehicles and electronic devices and large-scale energy storage to replace fossil fuels. Lithium-ion batteries (LIBs) are considered to be one of the most suitable energy storage technologies for these applications owing to low toxicity and high energy density and power. − However, LIBs with the most successful commercial anodic material based on graphite (372 mA h g –1 ) cannot satisfy the rapidly rising market demands. − …”