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Nanocellulose Structured Paper-Based Lithium Metal Batteries
Uppsala University, Disciplinary Domain of Science and Technology, Chemistry, Department of Chemistry - Ångström, Inorganic Chemistry.ORCID iD: 0000-0001-6118-0226
Uppsala University, Disciplinary Domain of Science and Technology, Chemistry, Department of Chemistry - Ångström, Inorganic Chemistry.
Uppsala University, Disciplinary Domain of Science and Technology, Technology, Department of Engineering Sciences, Nanotechnology and Functional Materials. (Nanoteknologi och funktionella material)
Uppsala University, Disciplinary Domain of Science and Technology, Chemistry, Department of Chemistry - Ångström, Structural Chemistry.ORCID iD: 0000-0003-4440-2952
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2018 (English)In: ACS Applied Energy Materials, ISSN 2574-0962, Vol. 1, no 8, p. 4341-4350Article in journal (Refereed) Published
Abstract [en]

We report for the first time, a lithium metal battery (LMB) design based on low-cost, renewable, and mechanically flexible nanocellulose fibers (NCFs) as the separator as well as substrate materials for both the positive and negative electrodes. Combined with carbon nanofibers, the NCFs yield 3D porous conducting cellulose paper (CCP) current collectors with large surface areas, enabling a low effective current density. The porous structure yields a dendrite-free deposition of lithium (Li), faciliates the mass transport within the electrodes, and also compensates for the volume changes during the cycling. Stable Li electrodes are obtained by electrodepositing Li on CCP substrates while positive electrodes are realized by embedding LiFePO4 (LFP) particles within the flexible CCP matrix. The mesoporous NCF separator features a homogeneous pore distribution which provides uniform current distributions at the electrodes. This effect, which yields a more homogeneous Li deposition on the negative electrode as well as improves the safety, lifespan, and sustainability of the LMB. As a result, the present all-nanocellulose-based LMB demonstrates excellent cycling stability for a Li metal battery obtained to date, with 91% capacity retention after 800 cycles and 85% capacity retention after 1000 cycles at a rate of 2 C (i.e., 1.27 mA cm–2).

Place, publisher, year, edition, pages
2018. Vol. 1, no 8, p. 4341-4350
National Category
Inorganic Chemistry Materials Chemistry Engineering and Technology
Research subject
Engineering Science with specialization in Nanotechnology and Functional Materials
Identifiers
URN: urn:nbn:se:uu:diva-358031DOI: 10.1021/acsaem.8b00961ISI: 000458706400094OAI: oai:DiVA.org:uu-358031DiVA, id: diva2:1241381
Funder
Swedish Energy AgencyStandUpSwedish Foundation for Strategic Research , RMA-110012Carl Tryggers foundation Available from: 2018-08-23 Created: 2018-08-23 Last updated: 2019-03-07Bibliographically approved
In thesis
1. Cladophora Cellulose-based Separators for Lithium Batteries
Open this publication in new window or tab >>Cladophora Cellulose-based Separators for Lithium Batteries
2019 (English)Doctoral thesis, comprehensive summary (Other academic)
Abstract [en]

The development of lithium-ion batteries (LIBs) has been focused on exploring and improving the electrode materials and electrolytes in the past decades. An indispensable component, the separator, is however not studied as extensively. In general, a separator has two functions, i.e. preventing the direct contact between the cathode and anode and providing the ionic transport pathways. Commercial separators for LIBs are usually made of polyolefin materials, which often have low thermal stabilities and poor electrolyte wettabilities.

In this thesis, a new type of material, i.e. Cladophora cellulose, is used to manufacture separators for LIBs and lithium-metal batteries (LMBs). The separators, made with Cladophora cellulose fibers via a straightforward paper making method, possess several advantages compared to conventional polyolefin separators regarding, e.g. ionic conductivity, thermal stability, electrolyte wettability and pore distribution, providing promising alternatives for battery separators.

Apart from studying the two basic functions mentioned above, two types of advanced separator functionalities have been studied, i.e. redox-activity and the attainment of a homogeneous current distribution, in conjunction with proposals for new separator designs.

Two types of redox-active separators have been devised for the first time in the separator field, based on the use of a redox-active conducting polymer, polypyrrole (PPy) and a natural polymer, polydopamine (PDA). Based on their redox-active potentials, the PPy-based redox-active separator was designed to contribute capacity to the cathode of a LIB, while the PDA-based redox-active separator was proposed to be used on the anode side.

It is known that a homogeneous current distribution is beneficial for the battery performance. Therefore, two new types of separators with homogenous pore distributions have been manufactured to study the influence of the pore distribution on the Li deposition/stripping behavior and composite cathode utilization in LMBs. With the knowledge obtained from the study, a stable, long lifetime paper-based LMB was designed.

Place, publisher, year, edition, pages
Uppsala: Acta Universitatis Upsaliensis, 2019. p. 61
Series
Digital Comprehensive Summaries of Uppsala Dissertations from the Faculty of Science and Technology, ISSN 1651-6214 ; 1754
Keywords
Cellulose, Separator, Paper making, Lithium-ion battery, Lithium-metal battery, Functionalization.
National Category
Materials Chemistry
Research subject
Chemistry with specialization in Materials Chemistry
Identifiers
urn:nbn:se:uu:diva-368963 (URN)978-91-513-0529-5 (ISBN)
Public defence
2019-02-08, Häggsalen, Ångströmlaboratoriet, Lägerhyddsvägen 1, Uppsala, 09:15 (English)
Opponent
Supervisors
Available from: 2019-01-16 Created: 2018-12-10 Last updated: 2019-01-21

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Wang, ZhaohuiPan, RuijunSun, RuiEdström, KristinaStrömme, MariaNyholm, Leif

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