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{Brugge:2019:10.1016/j.ssi.2019.04.021,
author = {Brugge, RH and Kilner, JA and Aguadero, A},
doi = {10.1016/j.ssi.2019.04.021},
journal = {Solid State Ionics},
pages = {154--160},
title = {Germanium as a donor dopant in garnet electrolytes},
url = {http://dx.doi.org/10.1016/j.ssi.2019.04.021},
volume = {337},
year = {2019}
}
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RIS format (EndNote, RefMan)

TY  - JOUR
AB  - Cubic Li 7 La 3 Zr 2 O 12 (LLZO) garnet electrolytes continue to be viewed as an enabler of all-solid-state lithium battery technologies, or as protective membranes for next-generation lithium battery systems. Supervalent dopants at the lithium sublattice are commonly used to stabilise the conductive cubic phase, through the creation of lithium vacancies. The use of germanium (Ge 4+ ) as a higher valent dopant substituting for Li + was studied here and shown to stabilise the cubic LLZO phase through substitution of x = 0.10 mol of Ge (at the tetrahedral 24d Li sites of the space group Ia-3d, based on the neutron powder diffraction result). This substitution preference follows that of Al 3+ (having a similar ionic radius and reported to reside at 24d sites), but with a lower critical concentration for cubic phase stabilisation, in agreement with charge neutrality arguments to obtain the required Li content (ca. 6.4–6.6 per formula unit) for optimum conductivity. The x = 0.10 composition gave the highest bulk Li ion conductivity of 2.8 × 10 −4 S cm −1 at 25 °C, on the order of reported values for Al-doped LLZO. Surface chemical analysis using time of flight secondary ion mass spectrometry showed Ge homogeneously distributed within the grains as well as some Li-, O- and Ge- enrichment along the grain boundaries. Cyclic voltammetry of the cells containing Ge-doped LLZO showed a redox stability up to +5 V.
AU  - Brugge,RH
AU  - Kilner,JA
AU  - Aguadero,A
DO  - 10.1016/j.ssi.2019.04.021
EP  - 160
PY  - 2019///
SN  - 0167-2738
SP  - 154
TI  - Germanium as a donor dopant in garnet electrolytes
T2  - Solid State Ionics
UR  - http://dx.doi.org/10.1016/j.ssi.2019.04.021
UR  - http://hdl.handle.net/10044/1/70565
VL  - 337
ER  -
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