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Mesoporous Cladophora cellulose separators for lithium-ion batteries
Uppsala universitet, Teknisk-naturvetenskapliga vetenskapsområdet, Kemiska sektionen, Institutionen för kemi - Ångström, Oorganisk kemi.
Uppsala universitet, Teknisk-naturvetenskapliga vetenskapsområdet, Tekniska sektionen, Institutionen för teknikvetenskaper, Nanoteknologi och funktionella material.ORCID-id: 0000-0002-4072-4324
Uppsala universitet, Teknisk-naturvetenskapliga vetenskapsområdet, Kemiska sektionen, Institutionen för kemi - Ångström, Oorganisk kemi.
Uppsala universitet, Teknisk-naturvetenskapliga vetenskapsområdet, Tekniska sektionen, Institutionen för teknikvetenskaper, Nanoteknologi och funktionella material.
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2016 (Engelska)Ingår i: Journal of Power Sources, ISSN 0378-7753, E-ISSN 1873-2755, Vol. 321, s. 185-192Artikel i tidskrift (Refereegranskat) Published
Resurstyp
Text
Abstract [en]

Much effort is currently made to develop inexpensive and renewable materials which can replace the polyolefin microporous separators conventionally used in contemporary lithium-ion batteries. In the present work, it is demonstrated that mesoporous Cladophora cellulose (CC) separators constitute very promising alternatives based on their high crystallinity, good thermal stability and straightforward manufacturing. The CC separators, which are fabricated using an undemanding paper-making like process involving vacuum filtration, have a typical thickness of about 35 mu m, an average pore size of about 20 nm, a Young's modulus of 5.9 GPa and also exhibit an ionic conductivity of 0.4 mS cm(-1) after soaking with 1 M LiPF6 EC: DEC (1/1, v/v) electrolyte. The CC separators are demonstrated to be thermally stable at 150 degrees C and electrochemically inert in the potential range between 0 and 5 V vs. Li+/Li. A LiFePO4/Li cell containing a CC separator showed good cycling stability with 99.5% discharge capacity retention after 50 cycles at a rate of 0.2 C. These results indicate that the renewable CC separators are well-suited for use in high-performance lithium-ion batteries.

Ort, förlag, år, upplaga, sidor
2016. Vol. 321, s. 185-192
Nyckelord [en]
Separator, Cellulose, Crystallinity, Paper-making, Lithium-ion battery, Cladophora
Nationell ämneskategori
Oorganisk kemi Teknik och teknologier
Identifikatorer
URN: urn:nbn:se:uu:diva-299548DOI: 10.1016/j.jpowsour.2016.04.115ISI: 000377729200020OAI: oai:DiVA.org:uu-299548DiVA, id: diva2:949809
Forskningsfinansiär
EnergimyndighetenStandUpStiftelsen Olle Engkvist ByggmästareTillgänglig från: 2016-07-25 Skapad: 2016-07-22 Senast uppdaterad: 2019-03-25
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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Pan, RuijunCheung, OceanWang, ZhaohuiTammela, PetterLindh, JonasEdström, KristinaStrömme, MariaNyholm, Leif

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