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Highly‐aligned ultra‐thick gel‐based cathodes unlocking ultra‐high energy density batteries

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Title: Highly‐aligned ultra‐thick gel‐based cathodes unlocking ultra‐high energy density batteries
Authors: Yang, S
Zhou, C
Wang, Q
Chen, B
Zhao, Y
Guo, B
Zhang, Z
Gao, X
Chowdhury, R
Wang, H
Lai, C
Brandon, NP
Wu, B
Liu, X
Item Type: Journal Article
Abstract: Increasing electrode thickness can substantially enhance the specific energy of lithium-ion batteries, however ionic transport, electronic conductivity and ink rheology are current barriers to adoption. Here a novel approach using a mixed xanthan gum and locust bean gum binder to construct ultra-thick electrodes is proposed to address above issues. After combining aqueous binder with single walled carbon nanotubes (SWCNT), active material (LiNi0.8Co0.1Mn0.1O2) and subsequent vacuum freeze drying, highly-aligned and low tortuosity structures with a porosity of ca. 50% can be achieved with an average pore size of 10 μm, whereby the gum binder-SWCNT-NMC811 forms vertical structures supported by tissue-like binder/SWCNT networks allowing for excellent electronic conducting phase percolation. As a result, ultra-thick electrodes with a mass loading of about 511 mg·cm-2 and 99.5 wt% active materials have been demonstrated with a remarkable areal capacity of 79.3 mAh·cm−2, which is the highest value reported so far. This represents a >25x improvement compared to conventional electrodes with an areal capacity of about 3 mAh·cm-2. This route also can be expanded to other electrode materials, such as LiFePO4 and Li4Ti5O12, and thus opens the possibility for low-cost and sustainable ultra-thick electrodes with increased specific energy for future lithium-ion batteries.
Issue Date: 1-Oct-2022
Date of Acceptance: 1-Aug-2021
URI: http://hdl.handle.net/10044/1/90825
DOI: 10.1002/eem2.12252
ISSN: 2575-0356
Publisher: Wiley
Start Page: 1332
End Page: 1339
Journal / Book Title: Energy & Environmental Materials
Volume: 5
Issue: 4
Copyright Statement: Copyright reserved
Keywords: Science & Technology
Materials Science, Multidisciplinary
Materials Science
gel-based cathodes
high areal capacity
lithium-ion battery
ultra-thick electrodes
Publication Status: Published
Open Access location: https://onlinelibrary.wiley.com/doi/10.1002/eem2.12252
Article Number: eem2.12252
Online Publication Date: 2021-08-02
Appears in Collections:Mechanical Engineering
Dyson School of Design Engineering
Faculty of Engineering