1. Effects of different carbon coatings on the ion transport mechanism and electrochemical performance of Li4Ti5O12 anode for Lithium ion batteries.
- Author
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Zeng, Chaozhi, Zhou, Weihang, Chen, Fengling, Ye, Qing, Li, Chaobo, and Huang, Chun
- Subjects
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LITHIUM-ion batteries , *ANODES , *SUPERIONIC conductors , *ELECTRIC conductivity , *SURFACE coatings , *AMORPHOUS carbon , *TRANSMISSION electron microscopy - Abstract
Li 4 Ti 5 O 12 (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. Unlabelled Image • A solid-state method to synthesize Li 4 Ti 5 O 12 nanoparticles coated with C • The crystalline C coating improved electric conductivity and Li ion diffusivity. • The optimal crystalline C coating is 3 wt% and ~1.2 nm thickness. [ABSTRACT FROM AUTHOR]
- Published
- 2020
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