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Research

My research focuses on fundamental insights into complex energy storage materials. Not stopping at the mechanistic picture, this understanding is applied to guide a rational search for, or design of, next generation materials. Battery and supercapacitor applications are ubiquitous and the need for higher capacity, longer lifetime, faster charging rates, and higher power capability in a safe and efficient manner will only continue to rise. Electric vehicles increasingly enter the roadways, intermittent renewable energy generation from solar and wind necessitate grid-scale energy storage, and the "internet of things" means portable energy storage demand is poised to grow from cell phones and laptops into new applications.

My research interests lie in structure–property relationships and the underlying characterisation of atomic and electronic structure. At the atomic level, I seek to understand crystalline, disordered, and defect structures, which requires a combination of local and long-range structural techniques. Synchrotron and neutron powder diffraction probe the long-range order while a combination of solid-state nuclear magnetic resonance (NMR) spectroscopy, high-energy X-ray absorption spectroscopy, and quantum mechanical electronic structure calculations give insights into the local order present in complex systems. NMR is also useful for probing ion dynamics e.g. lithium or sodium diffusion in battery materials. Furthermore, pulsed field gradient (PFG) NMR enables the direct measurement of self-diffusion with element-specificity, which enables one to probe e.g. 7Li diffusion in a mixed (e.g. ionic–electronic, multiple diffusing species) conducting system. The use and development of both ex situ and in situ/operando techniques has been important to achieve high resolution while taking care to observe metastable phases that may be induced during the discharge/charge of a battery material, especially at high-rate.

Theory and experiment are employed in a complementary manner in this work; integrating the experimental evidence with quantum mechanical calculations for atomic, spectroscopic, and electronic structure details can yield deeper insights into complex systems. For periodic systems and defect studies, I use the plane-wave DFT code CASTEP. In combination with solid-state NMR, the calculated shielding tensor (and quadrupolar tensor for I > 1/2 nuclei) can help distinguish sites or select between various crystallographic models. This combination is especially useful when analysing defects that are effectively invisible to average structure methods such as diffraction.

In terms of materials, I've been particularly interested in complex metal oxide structures such as the tungsten bronze (TB) phases and Wadsley-Roth crystallographic shear (CS) compounds. Even when viewed as ideal versions, these structure families exhibit superstructure, unit cells with hundreds of atoms, local polyhedral distortions, and cation disorder/compositional flexibility. Whilst less well understood than the archetypal layered metal oxide structure of LiCoO2 or olivine structure of LiFePO4, the disorder and chemical flexibility of these TB and CS phases may be worth the effort as they yield new and unique properties. On an entirely different type of battery chemistry, phosphorus is a "soft" element that is most commonly amorphous (red phosphorus) but exhibits layered (black phosphorus) and two-dimensional (phosphorene) analogues, which are all interesting lithium- and sodium-ion battery anode materials. In fact, the Na-P system represents the highest possible capacity of any sodium-ion battery anode. Through a collaboration with the Morris group (Cavendish, Cambridge; University of Birmingham,) on ab initio structure searching methods, I am employing NMR to answer fundamental questions concerning the alkali metal phosphide intermediates that form during the cycling of phosphorus batteries. This will be central to understanding and overcoming the capacity fade mechanism of this new battery candidate. Other side and collaborative projects include NMR and DFT studies of Zintl phases, the defect structure and energetics in doped Si3N4 (beta-SiAlON), atomic layer deposition coatings for battery cathodes, the relationship between surface structure, polyhedral distortions, and electrochemical properties of layered MAX phases and two-dimensional MXene materials, new applications of quadrupolar NMR (especially 17O, 27Al, 45Sc, and 93Nb), and electrochemical theory surrounding high-rate redox properties and phase transitions.

"Chemunicate" graphic on my work by Compound Interest

Short video on my research by the University of Cambridge

Profile (2016-17) on the Department Admissions Page

A column with Clare on battery safety and prospects for solid-state batteries in chem@cam (pg. 20-21)

Publications

  1. Griffith, Kent J.; Wiaderek, Kamila M.; Cibin, Giannantonio; Marbella, Lauren, E.; Grey, Clare P. Niobium Tungsten Oxides for High-Rate Lithium-ion Energy Storage. Nature 2018, 559, 556–563.

    DOI: 10.1038/s41586-018-0347-0 Free to read at https://rdcu.be/3vsr

  2. Marbella, Lauren E.; Evans, Matthew L.; Groh, Matthias F.; Nelson, Joseph; Griffith, Kent J.; Morris, Andrew J.; Grey, Clare P. Sodiation and Desodiation via Helical Phosphorus Intermediates in High-Capacity Anodes for Sodium-Ion Batteries. J. Am. Chem. Soc. 2018140, 7994–8004.

    DOI: 10.1021/jacs.8b04183 (Open access)

  3. Deng, Yue; Eames, Christopher; Nguyen, Long H. B.; Pecher, Oliver; Griffith, Kent J.; Courty, Matthieu; Fleutot, Benoit; Chotard, Jean-Noël; Grey, Clare P.; Islam, M. Saiful; Masquelier, Christian Crystal Structures, Local Atomic Environments and Ion Diffusion Mechanisms of Scandium-substituted NASICON Solid Electrolytes. Chem. Mater. 2018, 30, 2618–2630.
    DOI: 10.1021/acs.chemmater.7b05237 (Open access)

  4. Griffith, Kent J.; Senyshyn, Anatoliy; Grey, Clare P. Structural Stability from Crystallographic Shear in TiO2–Nb2O5 Phases: Cation Ordering and Lithiation Behavior of TiNb24O62. Inorg. Chem. 2017, 56, 4002–4010.
    DOI: 10.1021/acs.inorgchem.6b03154 
    You can view the full text of this article freely here

  5. Cozzan, Clayton; Griffith, Kent J.; Laurita, Geneva; Hu, Jerry G.; Grey, Clare P.; Seshadri, Ram Structural Evolution and Atom Clustering in β-SiAlON: β-Si6–zAlzOzN8–z. Inorg. Chem. 2017, 56, 2153–2158.
    DOI: 10.1021/acs.inorgchem.6b02780 (Open access)

  6. Pecher, Oliver; Halat, David M.; Lee, Jeongjae; Liu, Zigeng; Griffith, Kent J.; Braun, Marco; Grey, Clare P. Enhanced Efficiency of Solid-State NMR Investigations of Energy Materials using an External Automatic Tuning/Matching (eATM) Robot. J. Magn. Reson. 2017, 275, 127-136.
    DOI: 10.1016/j.jmr.2016.12.008 (Open access)

  7. Pecher, Oliver; Carretero-González, Javier; Griffith, Kent J.; Grey, Clare P. Materials’ Methods: NMR in Battery Research. Chem. Mater. 2016.
    DOI: 10.1021/acs.chemmater.6b03183 (Open access)

  8. Scherf, Lavinia M.; Pecher, Oliver; Griffith, Kent J.; Haarmann, Frank; Grey, Clare P.; Fässler, Thomas F. Zintl Phases K4−xNaxSi4 (1 ≤ x ≤ 2.2) and K7NaSi8: Synthesis, Crystal Structures, and Solid State NMR Spectroscopic Investigations. Eur. J. Inorg. Chem. 2016, 4674-4682.
    DOI: 10.1002/ejic.201600735

  9. Oyama, Gosuke; Pecher, Oliver; Griffith, Kent J.; Nishimura, Shin-ichi; Pigliapochi, Roberta, Grey, Clare P.; Yamada, Atsuo Sodium Intercalation Mechanism of 3.8 V Class Alluaudite Sodium Iron Sulfate. Chem. Mater. 2016, 28, 5321-5328.
    DOI: 10.1021/acs.chemmater.6b01091 (Open access)

  10. Editors’ Choice Article, JACS Spotlight Article
    Griffith, Kent J.; Forse, Alexander C.; Griffin, John M.; Grey, Clare P. High-Rate Intercalation without Nanostructuring in Metastable Nb2O5 Bronze Phases. J. Am. Chem. Soc. 2016, 138, 8888–8899.
    DOI: 10.1021/jacs.6b04345 (Open access)

  11. Mayo, Martin; Griffith, Kent J.; Pickard, Chris J.; Morris, Andrew J. Ab Initio Study of Phosphorus Anodes for Lithium- and Sodium-Ion Batteries. Chem. Mater. 2016, 28, 2011-2021.
    DOI: 10.1021/acs.chemmater.5b04208 (Open access)

  12. Hope, Michael A.; Forse, Alex, C.; Griffith, Kent J.; Lukatskaya, Maria R.; Ghidiu, Michael; Gogotsi, Yury; Grey, Clare P. NMR Reveals the Surface Functionalisation of Ti3C2 MXene. Phys. Chem. Chem. Phys. 2016, 18, 5099-5102.
    DOI: 10.1039/C6CP00330C (Open access)

  13. Ewing, Michael A.; Conant, Christopher R. P.; Zucker, Steven M.; Griffith, Kent J.; Clemmer, David E. Selected Overtone Mobility Spectrometry (SOMS). Anal. Chem. 2015, 87, 5132-5138.
    DOI: 10.1021/ac504555u You can view the full text of this article freely here

  14. Foley, Matthew P.; Du, Peng; Griffith, Kent J.; Karty, Jonathan A.; Mubarak, Muhammad S.; Raghavachari, Krishnan; Peters, Dennis G. J. Electrochemistry of Substituted Salen Complexes of Nickel(II): Nickel(I)-catalyzed Reduction of Alkyl and Acetylenic Halides. Electroanal. Chem. 2010, 647, 194-203.
    DOI: 10.1016/j.jelechem.2010.06.001

 

Educational Background

2013Present

University of Cambridge


Cambridge, UK

PhD+ with Prof. Clare P. Grey, FRS (Chemistry)

20092013
Indiana University

Bloomington, IN, USA

B.S. Chemistry

Minors: Mathematics, Geological Sciences

Research Projects with Prof. David E. Clemmer (Chemistry), Prof. David L. Bish (Geological Sciences), and Prof. Dennis G. Peters (Chemistry)

 

Contact Information

kg376 [at] cam.ac.uk

kentjgriffith [at] gmail.com

Department of Chemistry

University of Cambridge

Lensfield Road

Cambridge, CB2 1EW

United Kingdom

Publications

Niobium tungsten oxides for high-rate lithium-ion energy storage
KJ Griffith, KM Wiaderek, G Cibin, LE Marbella, CP Grey
– Nature
(2018)
559,
556
Sodiation and Desodiation via Helical Phosphorus Intermediates in High-Capacity Anodes for Sodium-Ion Batteries.
LE Marbella, ML Evans, MF Groh, J Nelson, KJ Griffith, AJ Morris, CP Grey
– Journal of the American Chemical Society
(2018)
140,
7994
Interface Instability in LiFePO<inf>4</inf>- Li<inf>3+x</inf>P<inf>1-x</inf>Si<inf>x</inf>O<inf>4</inf>All-Solid-State Batteries
MF Groh, MJ Sullivan, MW Gaultois, O Pecher, KJ Griffith, CP Grey
– Chemistry of Materials
(2018)
Crystal Structures, Local Atomic Environments, and Ion Diffusion Mechanisms of Scandium-Substituted Sodium Superionic Conductor (NASICON) Solid Electrolytes
Y Deng, C Eames, LHB Nguyen, O Pecher, KJ Griffith, M Courty, B Fleutot, JN Chotard, CP Grey, MS Islam, C Masquelier
– Chemistry of Materials
(2018)
30,
2618
Structural Stability from Crystallographic Shear in TiO 2 –Nb 2 O 5 Phases: Cation Ordering and Lithiation Behavior of TiNb 24 O 62
KJ Griffith, A Senyshyn, CP Grey
– Inorg Chem
(2017)
56,
4002
Structural Evolution and Atom Clustering in β-SiAlON: β-Si6-zAlzOzN8-z.
C Cozzan, KJ Griffith, G Laurita, JG Hu, CP Grey, R Seshadri
– Inorg Chem
(2017)
56,
2153
Enhanced efficiency of solid-state NMR investigations of energy materials using an external automatic tuning/matching (eATM) robot
O Pecher, DM Halat, J Lee, Z Liu, KJ Griffith, M Braun, CP Grey
– Journal of Magnetic Resonance
(2017)
275,
127
Materials' methods: NMR in battery research
O Pecher, J Carretero-Gonzalez, KJ Griffith, CP Grey
– Chemistry of Materials
(2017)
29,
213
Zintl Phases K₄₋ₓNaₓSi₄(1 ≤ x ≤ 2.2) and K₇NaSi₈: Synthesis, Crystal Structures, and Solid-State NMR Spectroscopic Investigations
LM Scherf, O Pecher, KJ Griffith, F Haarmann, CP Grey, TF Fässler
– European Journal of Inorganic Chemistry
(2016)
2016,
4674
Sodium Intercalation Mechanism of 3.8 V Class Alluaudite Sodium Iron Sulfate
G Oyama, O Pecher, KJ Griffith, SI Nishimura, R Pigliapochi, CP Grey, A Yamada
– Chemistry of Materials
(2016)
28,
5321
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Telephone number

01223 763526

Email address