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Nanocellulose Modified Polyethylene Separators for Lithium Metal Batteries
Uppsala universitet, Teknisk-naturvetenskapliga vetenskapsområdet, Kemiska sektionen, Institutionen för kemi - Ångström, Oorganisk kemi.
Uppsala universitet, Teknisk-naturvetenskapliga vetenskapsområdet, Tekniska sektionen, Institutionen för teknikvetenskaper, Fasta tillståndets elektronik.
Uppsala universitet, Teknisk-naturvetenskapliga vetenskapsområdet, Tekniska sektionen, Institutionen för teknikvetenskaper, Nanoteknologi och funktionella material. (Nanoteknologi och funktionella material)
Uppsala universitet, Teknisk-naturvetenskapliga vetenskapsområdet, Kemiska sektionen, Institutionen för kemi - Ångström, Oorganisk kemi.ORCID-id: 0000-0001-6118-0226
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2018 (Engelska)Ingår i: Small, ISSN 1613-6810, E-ISSN 1613-6829, Vol. 14, nr 21, artikel-id 1704371Artikel i tidskrift (Refereegranskat) Published
Abstract [en]

Abstract Poor cycling stability and safety concerns regarding lithium (Li) metal anodes are two major issues preventing the commercialization of high‐energy density Li metal‐based batteries. Herein, a novel tri‐layer separator design that significantly enhances the cycling stability and safety of Li metal‐based batteries is presented. A thin, thermally stable, flexible, and hydrophilic cellulose nanofiber layer, produced using a straightforward paper‐making process, is directly laminated on each side of a plasma‐treated polyethylene (PE) separator. The 2.5 µm thick, mesoporous (≈20 nm average pore size) cellulose nanofiber layer stabilizes the Li metal anodes by generating a uniform Li+ flux toward the electrode through its homogenous nanochannels, leading to improved cycling stability. As the tri‐layer separator maintains its dimensional stability even at 200 °C when the internal PE layer is melted and blocks the ion transport through the separator, the separator also provides an effective thermal shutdown function. The present nanocellulose‐based tri‐layer separator design thus significantly facilitates the realization of high‐energy density Li metal‐based batteries.

Ort, förlag, år, upplaga, sidor
Wiley-VCH Verlagsgesellschaft, 2018. Vol. 14, nr 21, artikel-id 1704371
Nyckelord [en]
cellulose, current distribution, lithium dendrites, lithium metal batteries, separators
Nationell ämneskategori
Materialkemi Teknik och teknologier
Forskningsämne
Teknisk fysik med inriktning mot nanoteknologi och funktionella material
Identifikatorer
URN: urn:nbn:se:uu:diva-349143DOI: 10.1002/smll.201704371ISI: 000434173300006PubMedID: 29675952OAI: oai:DiVA.org:uu-349143DiVA, id: diva2:1199741
Forskningsfinansiär
Stiftelsen för strategisk forskning (SSF), RMA-110012EnergimyndighetenStandUpTillgänglig från: 2018-04-22 Skapad: 2018-04-22 Senast uppdaterad: 2018-12-10Bibliografiskt granskad
Ingår i avhandling
1. Cladophora Cellulose-based Separators for Lithium Batteries
Öppna denna publikation i ny flik eller fönster >>Cladophora Cellulose-based Separators for Lithium Batteries
2019 (Engelska)Doktorsavhandling, sammanläggning (Övrigt vetenskapligt)
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.

Ort, förlag, år, upplaga, sidor
Uppsala: Acta Universitatis Upsaliensis, 2019. s. 61
Serie
Digital Comprehensive Summaries of Uppsala Dissertations from the Faculty of Science and Technology, ISSN 1651-6214 ; 1754
Nyckelord
Cellulose, Separator, Paper making, Lithium-ion battery, Lithium-metal battery, Functionalization.
Nationell ämneskategori
Materialkemi
Forskningsämne
Kemi med inriktning mot materialkemi
Identifikatorer
urn:nbn:se:uu:diva-368963 (URN)978-91-513-0529-5 (ISBN)
Disputation
2019-02-08, Häggsalen, Ångströmlaboratoriet, Lägerhyddsvägen 1, Uppsala, 09:15 (Engelska)
Opponent
Handledare
Tillgänglig från: 2019-01-16 Skapad: 2018-12-10 Senast uppdaterad: 2019-01-21

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