Premium
Binder‐Free Hybrid Titanium–Niobium Oxide/Carbon Nanofiber Mats for Lithium‐Ion Battery Electrodes
Author(s) -
Tolosa Aura,
Fleischmann Simon,
Grobelsek Ingrid,
Quade Antje,
Lim Eunho,
Presser Volker
Publication year - 2018
Publication title -
chemsuschem
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 2.412
H-Index - 157
eISSN - 1864-564X
pISSN - 1864-5631
DOI - 10.1002/cssc.201701927
Subject(s) - materials science , monoclinic crystal system , nanofiber , tetragonal crystal system , electrochemistry , niobium oxide , chemical engineering , niobium , anode , lithium ion battery , oxide , electrode , titanium , lithium (medication) , battery (electricity) , carbon nanofiber , carbon fibers , nanotechnology , crystal structure , composite material , metallurgy , carbon nanotube , crystallography , chemistry , composite number , endocrinology , engineering , power (physics) , quantum mechanics , medicine , physics
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 2 O 5 /C and monoclinic Ti 2 Nb 10 O 29 /C hybrid nanofibers synthesized at 1000 °C displayed the highest electrochemical performance, with capacity values of 243 and 267 mAh g −1 , respectively, normalized to the electrode mass. At 5 A g −1 , the Nb 2 O 5 /C and Ti 2 Nb 10 O 29 /C hybrid fibers maintained 78 % and 53 % of the initial capacity, respectively. The higher rate performance and stability of tetragonal Nb 2 O 5 compared to that of monoclinic Ti 2 Nb 10 O 29 is related to the low energy barriers for Li + transport in its crystal structure, with no phase transformation. The improved rate performance resulted from the excellent charge propagation in the continuous nanofiber network.