Binder-Free Hybrid Titanium-Niobium Oxide/Carbon Nanofiber Mats for Lithium-Ion Battery Electrodes

作者：Tolosa Aura; Fleischmann Simon; Grobelsek Ingrid; Quade Antje; Lim Eunho; Presser Volker

来源：Chemsuschem, 2018, 11(1): 159-170.

DOI：10.1002/cssc.201701927

<jats:title>Abstract</jats:title><jats:p>Free‐standing, binder‐free, titanium–niobium oxide/carbon hybrid nanofibers are prepared for Li‐ion battery applications. A one‐pot synthesis offers a significant reduction of processing steps and avoids the use of environmentally unfriendly binder materials, making the approach highly sustainable. Tetragonal Nb<jats:sub>2</jats:sub>O<jats:sub>5</jats:sub>/C and monoclinic Ti<jats:sub>2</jats:sub>Nb<jats:sub>10</jats:sub>O<jats:sub>29</jats:sub>/C hybrid nanofibers synthesized at 1000 °C displayed the highest electrochemical performance, with capacity values of 243 and 267 mAh g<jats:sup>−1</jats:sup>, respectively, normalized to the electrode mass. At 5 A g<jats:sup>−1</jats:sup>, the Nb<jats:sub>2</jats:sub>O<jats:sub>5</jats:sub>/C and Ti<jats:sub>2</jats:sub>Nb<jats:sub>10</jats:sub>O<jats:sub>29</jats:sub>/C hybrid fibers maintained 78 % and 53 % of the initial capacity, respectively. The higher rate performance and stability of tetragonal Nb<jats:sub>2</jats:sub>O<jats:sub>5</jats:sub> compared to that of monoclinic Ti<jats:sub>2</jats:sub>Nb<jats:sub>10</jats:sub>O<jats:sub>29</jats:sub> is related to the low energy barriers for Li<jats:sup>+</jats:sup> transport in its crystal structure, with no phase transformation. The improved rate performance resulted from the excellent charge propagation in the continuous nanofiber network.</jats:p>

• 出版日期2018-1-10