Abstract
Li4Ti5O12 (LTO) nanoparticles coated with two types of carbon were synthesized for the anode of lithium ion batteries (LIBs). One type was LTO coated with crystalline carbon from graphite-based mesocarbon microbeads (LTO-MCMB), and the other type was LTO coated with amorphous carbon (LTO-AMC). Transmission electron microscopy (TEM) results indicate that MCMB and amorphous carbon were uniformly coated on the LTO nanoparticles surface using a facile solid-state synthesis method. Electrochemical characterization results show that the rate capability and cycle performance of LTO-MCMB were better than those of LTO-AMC. For example, at an extremely fast charge and discharge rate of 20C (~3 min charge or discharge), LTO-MCMB with 3 wt% MCMB still maintained a high specific capacity of 117 mAh g−1, compared with 91 mAh g−1 for LTO-AMC, demonstrating that particle surface engineering at the nanoscale is an efficient method to improve the energy storage performance of the anode material.
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