Imperial College London
Alternate

Dr Ainara Aguadero

Faculty of Engineering, Department of Materials

Visiting Reader
 
 
 
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Contact

 

+44 (0)20 7594 5174a.aguadero CV

 
 
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Location

 

1.07Royal School of MinesSouth Kensington Campus

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Summary

 

Publications

Citation

BibTex format

@article{Pesci:2020:10.1021/acsami.0c08605,
author = {Pesci, FM and Bertei, A and Brugge, RH and Emge, SP and Hekselman, AKO and Marbella, LE and Grey, CP and Aguadero, A},
doi = {10.1021/acsami.0c08605},
journal = {ACS Applied Materials and Interfaces},
pages = {32086--32816},
title = {Establishing ultra-low activation energies for lithium transport in garnet electrolytes.},
url = {http://dx.doi.org/10.1021/acsami.0c08605},
volume = {12},
year = {2020}
}
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RIS format (EndNote, RefMan)

TY  - JOUR
AB  - Garnet-type structured lithium ion conducting ceramics represent a promising alternative to liquid-based electrolytes for all-solid-state batteries. However, their performance is limited by their polycrystalline nature and the inherent inhomogeneous current distribution due to the different ion dynamics at grains, grain boundaries and interfaces. In this study we use a combination of electrochemical impedance spectroscopy, distribution of relaxation times analysis and solid state nuclear magnetic resonance (NMR), in order to understand the role that bulk, grain boundary and interfacial processes play in the ionic transport and electrochemical performance of garnet based cells. Variable temperature impedance analysis reveals the lowest activation energy (Ea) for Li transport in the bulk of the garnet electrolyte (0.15 eV), consistent with pulsed field gradient NMR spectroscopy measurements (0.14 eV). We also show a decrease in grain boundary activation energy at temperatures below 0 °C, that is followed by the total conductivity, suggesting that the bottleneck to ionic transport resides in the grain boundaries. We reveal that the grain boundary activation energy is heavily affected by its composition that, in turn, is mainly affected by the segregation of dopants and Li. We suggest that by controlling the grain boundary composition, it would be possible to pave the way towards targeted engineering of garnet-type electrolytes and ameliorate their electrochemical performance in order to enable their use in commercial devices.
AU  - Pesci,FM
AU  - Bertei,A
AU  - Brugge,RH
AU  - Emge,SP
AU  - Hekselman,AKO
AU  - Marbella,LE
AU  - Grey,CP
AU  - Aguadero,A
DO  - 10.1021/acsami.0c08605
EP  - 32816
PY  - 2020///
SN  - 1944-8244
SP  - 32086
TI  - Establishing ultra-low activation energies for lithium transport in garnet electrolytes.
T2  - ACS Applied Materials and Interfaces
UR  - http://dx.doi.org/10.1021/acsami.0c08605
UR  - https://www.ncbi.nlm.nih.gov/pubmed/32573199
UR  - https://pubs.acs.org/doi/10.1021/acsami.0c08605
UR  - http://hdl.handle.net/10044/1/80321
VL  - 12
ER  -
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