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Li4Ti5O12 flexible, lightweight electrodes based on cellulose nanofibrils as binder and carbon fibers as current collectors for Li-ion batteries
KTH, School of Chemical Science and Engineering (CHE), Chemical Engineering and Technology, Applied Electrochemistry.
KTH, School of Chemical Science and Engineering (CHE), Chemical Engineering and Technology, Applied Electrochemistry.
KTH, School of Chemical Science and Engineering (CHE), Chemical Engineering and Technology, Applied Electrochemistry.
KTH, School of Chemical Science and Engineering (CHE), Chemical Engineering and Technology, Applied Electrochemistry. KTH, School of Chemical Science and Engineering (CHE), Centres, Wallenberg Wood Science Center.
2017 (English)In: Nano Energy, ISSN 2211-2855, E-ISSN 2211-3282, Vol. 39, 140-150 p.Article in journal (Refereed) Published
Abstract [en]

TEMPO oxidized cellulose nanofibrils (TOCNF) were used as binder material to prepare bendable Li4Ti5O12 (LTO) electrodes. Carbon fiber (CF) layers were integrated as current collectors to enhance the mechanical properties and to increase the specific energy of the electrodes. These electrodes combined with CF current collectors (LTO/CF) show good electrochemical properties and are flexible, sustainable, mechanical and chemical stable, lightweight and produced by a water-based easy filtration process. An increase of the active material weight (LTO) from around 19% to 71% of the electrode and current collector combined weight is demonstrated with CF compared with a copper current collector. Additionally, preparation of the current collector material is non-expensive, quick and easy compared to that of carbon nanotube or graphene. To test the flexible battery application, 4000 times repeated bending was carried out on both the LTO electrodes and the LTO/CF electrodes. This had no significant effect on the morphology, mechanical and electrochemical properties of neither the LTO nor the LTO/CF electrodes. Addition of the CF layer improves the mechanical properties and specific capacity of the LTO-electrode. A thicker LTO electrode with only 2 wt% TOCNF is demonstrated which is promising for thicker electrodes with high energy density. A full cell was assembled with the LTO/CF as negative electrode and LiFePO4 (LFP)/CF as positive, which exhibited a stable cycling performance and good energy density.

Place, publisher, year, edition, pages
Elsevier, 2017. Vol. 39, 140-150 p.
Keyword [en]
Carbon fiber current collector, Flexible lithium ion batteries, Li4Ti5O12 electrodes, Lightweight, TEMPO-oxidized CNF, Water-based binder
National Category
Materials Chemistry
Identifiers
URN: urn:nbn:se:kth:diva-212239DOI: 10.1016/j.nanoen.2017.06.043ISI: 000408878200014Scopus ID: 2-s2.0-85021718504OAI: oai:DiVA.org:kth-212239DiVA: diva2:1134986
Funder
Knut and Alice Wallenberg FoundationSwedish Energy Agency, 37712-1
Note

QC 20170822

Available from: 2017-08-22 Created: 2017-08-22 Last updated: 2017-09-27Bibliographically approved

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Lu, HuiranHagberg, JohanLindbergh, GöranCornell, Ann
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