10 november 2017 3d imaging studies on electrochemical … · 2017-12-14 · 1 μm 1 μm (xy) slice...
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MANIFEST Researcher Workshop
3D imaging studies on
electrochemical systems at
Imperial College London
Dami Taiwo, Vladimir Yufit, Farid Tariq, Enrique Ruiz-Trejo, Antonio Bertei,
Kristina Maria Kareh, Ann Huang, Barun Chakrabarti, Moshiel Biton,
Sam Cooper, Nigel P. Brandon
10 November 2017
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Batteries and fuel cells
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Electrode microstructurefor
Performance optimisation
↓Bulk properties• volume fractions• connectivity• area per unit
volume
Degradation
↓Local hot spots
Structural evolution
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3D Imaging Facilities
• Lab X-ray CT* unit with high-efficiency flat panel
detector.
• Up to 1 µm spatial resolution.
• Capability to incorporate in-situ rigs for dynamic
experiments.
• Access to FIB-SEM tomography equipment.
• High spatial resolution (<10 nm for FIB imaging).
• Better suited for nanostructured material analysis.
*From energy storage capital grant : EPSRC Capital for Great Technologies call - Grid-Scale Energy Storage
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Zn dendrite formation during the first charge
Zn(OH)42-
KOH
additives
Pump
Zn + 4OH- ↔Zn(OH)42- + 2e-
Load / Power generator
1/2O2 + H2O + 2e- ↔ 2OH-
OH-OH-
ZnZn
Air
Air
Zinc-based flow batteries – Morphological degradation of Zn
5
M. Biton,F. Tariq,V. Yufit, Z. Chen,N. Brandon, Acta Materialia 2017, 141, 39-46
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Zn(OH)42-
KOH
additives
Pump
Zn + 4OH- ↔Zn(OH)42- + 2e-
Load / Power generator
1/2O2 + H2O + 2e- ↔ 2OH-
OH-OH-
ZnZn
Air
Air
Zinc-based flow batteries – Morphological degradation of Zn
In-situ observation of Zn dendritic growth
M. Biton,F. Tariq,V. Yufit, Z. Chen,N. Brandon, Acta Materialia 2017, 141, 39-46
6
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No rGO Single side rGO Double side rGO
Vanadium redox flow batteries – Carbon paper modification
Total specific
surface area with
XCT [μm2 μm−3]
BET specific
surface area
[μm2 μm−3]
Untreated CP 0.81 2.8
One-sided 1.01 5.1
Double sided 1.11 11.1
B. Chakrabarti, D. Nir, V. Yufit, F. Tariq, J. Rubio-Garcia, R. Maher, A. Kucernak, P. Aravind, N. Brandon, ChemElectroChem 2017, 4, 194.
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Lithium-ion batteries – Thick electrodes with controlled porosity
Image ref: Deville, S., Ice templating of
porous materials
Cross section
SEM
X-ray µCT
• In collaboration with Prof. P. Grant and Dr. A. Huang (Oxford)
• Manufacture of thick high energy density electrodes
• Improve battery power through microstructure control
Si/SiOX
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Solid Oxide Fuel Cells – Microstructural degradation in NiScSZ
1 μm
1 μm
(xy) slice
Deg
rad
ed
an
od
e
Init
ial
an
od
e
Ni + ScSZ
1 µm
1 µm
TPBsFIB-SEM
0
5
10
15
20
0 5 10 15 20 25 30 35 40
-ZIm
/ W
cm
-2
ZRe / W cm-2
200 h80 h24 h2 h0.5 h
x19550 C @ OCV5% H2/3% H2O
oxygentransfer
ScSZ-YSZ
distributedcharge transfer
at TPB
gasdiffusiontest rig
ohmic
A.Bertei, E.Ruiz-Trejo, K.Kareh, V.Yufit, X.Wang, F.Tariq, N.P.Brandon, Nano Energy 2017, 36, 526-536
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Solid Oxide Fuel Cells – Microstructural degradation in NiScSZ
0.0
0.5
1.0
1.5
2.0
2.5
3.0
NiS
cS
z a
rea (
m2
m-3) Initial
Degraded
2.39 1.85
0
5
10
15
20
25
TP
B d
en
sit
y (
m
m-3) Initial
Degraded
19.77 11.67
1 μm
1 μm
(xy) slice
De
gra
de
d a
no
de
In
itia
l a
no
de
Ni + ScSZ
1 µm
1 µm
TPBsNi + ScSZ
1 μm
1 μm
(xy) slice
De
gra
de
d a
no
de
In
itia
l a
no
de
Ni + ScSZ
1 µm
1 µm
TPBs
A.Bertei, E.Ruiz-Trejo, K.Kareh, V.Yufit, X.Wang, F.Tariq, N.P.Brandon, Nano Energy 2017, 36, 526-536
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Thanks to..
Vladimir
Yufit
Farid Tariq Sam Cooper Enrique
Ruiz-Trejo
Antonio
Bertei
Kristina
Maria KarehBarun
Chakrabarti
Ann HuangMoshiel
Biton