Engineering Carbon Architectures in Single particles for High Performance Electrode Materials
Key Laboratory of Molecular Nanoscience and Nanostructure, Institute of Chemistry, CAS
Abstract：Carbon have found broad applications in the electrochemical field, particularly as electrode materials or electronically conductive additives. Here we’ll report our research progress in the structural engineering of carbon-based materials with focus on the creation of hollow structure inside single particles so as to exploit their potential in different battery systems. We have paid special attention to the synthesis strategy and formation mechanism of these structures, and then tried to deconvolute the structure-performance relationship. Two different cases will be addresses: First, the construction and optimization of a hybrid hollow structure of Li4Ti5O12-Carbon (LTO-C) with carbon acting as an electronically-conductive matrix suited for a high performance anode material in lithium ion batteries. We identified that a progressively-inward crystallization process inside the solid precursor would build up the inner structural tension, which finally led to the gradual hollowing of the LTO-C particles. We confirmed that a hollow structure as well as the hybrid wall was highly favorable for the application of LTO in lithium ion batteries with much higher discharge capacity and much improved rate capability.1 Second, we revealed the inhomogeneous compositional distribution inside polymeric nanospheres and confirmed that nanoparticles themselves stood for an effective and versatile synthetic platform for functional hollow carbon architectures. We showed that this intraparticle difference could be well exploited to craft complex structures with desirable structural characters for their applications; for example, high-capacity anode for potassium-ion batteries battery has been demonstrated with the multi-shelled hollow carbon nanospheres.