Journal
ACS APPLIED MATERIALS & INTERFACES
Volume 10, Issue 6, Pages 5385-5394Publisher
AMER CHEMICAL SOC
DOI: 10.1021/acsami.7b13802
Keywords
silk fibroin membranes; beta-sheet conformations; environmental issues; battery separator; lithium-ion batteries
Funding
- Portuguese Foundation for Science and Technology (FCT) [UID/FIS/04650/2013, ULD/QUI/00686/2013, ULD/QUI/00686/2016]
- FEDER funds through the COMPETE 2020 Programme and National Funds through FCT [PTDC/CTM-ENE/5387/2014, UID/CTM/50025/2013, PEst-OE/QUI/UI0616/2014, LUMECD (POCI-01-0145-FEDER-016884), PTDC/CTM-NAN/0956/2014, SFRH/BPD/87759/2012, SFRH/BPD/112547/2015]
- National Funds through FCT [PTDC/CTM-ENE/5387/2014, UID/CTM/50025/2013, PEst-OE/QUI/UI0616/2014, LUMECD (POCI-01-0145-FEDER-016884), PTDC/CTM-NAN/0956/2014, SFRH/BPD/87759/2012, SFRH/BPD/112547/2015]
- Spanish Ministry of Economy and Competitiveness (MINECO) [MAT2016-76039-C4-3-R]
- Basque Government Industry Department under the ELKARTEK program
- Fundação para a Ciência e a Tecnologia [PEst-OE/QUI/UI0616/2014, PTDC/CTM-NAN/0956/2014] Funding Source: FCT
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Battery separators based on silk fibroin (SF) have been prepared aiming at improving the environmental issues of lithium-ioh, batteries. SF materials with three different morphologies were produced: membrane films (SF-F), sponges prepared by lyophilization (SF-L) and: electrospuri membranes (SF-E). The latter Materials presented a suitable porons,three-dimensional microstructure and were soaked with a I M LiPF6 electrolyte: The ionic conductivities for SF-L and SF-E were 1.00 and 0.32 mS cm(-1) at 20 degrees C, respectively. A correlation between the fraction of beta-sheet conformations and the ionic conductivity was observed. The electrochemical performance of the SF-based materials was evaluated by incorporating them in cathodic half-cells with C-LiFePO4. The discharge capacities of SF-L and SF-E were 126 and 108 mA h g(-1), respectively, at the C/Iirate and 99 and 54 mA h g(-1), respectively, at the 2C-rate. Furthermore, the capacity retention and capacity fade of the SF-L membrane after 50 cycles at the 2C-rate were 72 and 5%, respectively. These electrochemical results show that a high percentage of beta-sheet conformations, were of prime importance to guarantee excellent cycling performance. This work demonstrates that SP-based membranes are appropriate separators for the production of environmentally friendlier lithium-ion batteries.
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