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Bicontinuous Electrolytes via Thermally Initiated Polymerization for Structural Lithium Ion Batteries
KTH, School of Engineering Sciences (SCI), Aeronautical and Vehicle Engineering. KTH, School of Engineering Sciences in Chemistry, Biotechnology and Health (CBH), Fibre- and Polymer Technology.
KTH, School of Engineering Sciences in Chemistry, Biotechnology and Health (CBH), Fibre- and Polymer Technology.ORCID iD: 0000-0003-0618-1730
KTH, School of Engineering Sciences (SCI), Aeronautical and Vehicle Engineering.ORCID iD: 0000-0002-9744-4550
KTH, School of Engineering Sciences in Chemistry, Biotechnology and Health (CBH), Fibre- and Polymer Technology.ORCID iD: 0000-0003-3201-5138
2019 (English)In: ACS Applied Energy Materials, ISSN 2574-0962, Vol. 2, no 6, p. 4362-4369Article in journal (Refereed) Published
Abstract [en]

Structural batteries (SBs) are a growing research subject worldwide. The idea is to provide massless energy by using a multifunctional material. This technology can provide a new pathway in electrification and offer different design opportunities and significant weight savings in vehicle applications. The type of SB discussed here is a multifunctional material that can carry mechanical loads and simultaneously provide an energy storage function. It is a composite material that utilizes carbon fibers (CFs) as electrodes and structural reinforcement which are embedded in a multifunctional polymer matrix (i.e., structural battery electrolyte). A feasible composite manufacturing method still needs to be developed to realize a full-cell SB. UV initiated polymerization induced phase separation (PIPS) has previously been used to make bicontinuous structural battery electrolytes (SBE) with good ionic conductivity and mechanical performance. However, UV-curing cannot be used for fabrication of a full cell SB since a full-cell is made of multiple layers of nontransparent CFs. The present paper investigates thermally initiated PIPS to prepare a bicontinuous SBE and an SB half-cell. In addition, the effect of curing temperature was examined with respect to curing performance, morphology, ionic conductivity, and mechanical and electrochemical performance. The study revealed that thermally initiated PIPS provides a robust and scalable process route to fabricate SBs. The results of this study are an important milestone in the development of SB technology as they allow for the SB fabrication for an actual application. However, other challenges still remain to be solved before this technology can be introduced into an application.

Place, publisher, year, edition, pages
American Chemical Society (ACS), 2019. Vol. 2, no 6, p. 4362-4369
Keywords [en]
thermal polymerization, lithium ion conductivity, polymerization induced microphase separation, bicontinuous morphology, polymer electrolyte matrices
National Category
Polymer Chemistry
Identifiers
URN: urn:nbn:se:kth:diva-255322DOI: 10.1021/acsaem.9b00563ISI: 000473116600049Scopus ID: 2-s2.0-85068010658OAI: oai:DiVA.org:kth-255322DiVA, id: diva2:1340457
Note

QC 20190805

Available from: 2019-08-05 Created: 2019-08-05 Last updated: 2019-08-05Bibliographically approved

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Ihrner, NiklasZenkert, DanJohansson, Mats

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