Assefa, TA;
Suzana, AF;
Wu, L;
Koch, RJ;
Li, L;
Cha, W;
Harder, RJ;
... Robinson, IK; + view all
(2021)
Imaging the Phase Transformation in Single Particles of the Lithium Titanate Anode for Lithium-Ion Batteries.
ACS Applied Energy Materials
, 4
(1)
pp. 111-118.
10.1021/acsaem.0c02010.
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Abstract
Lithium uptake and release in lithium titanate (LTO) anode materials during a discharge and charge cycle is one of the fundamental processes of a lithium-ion battery (LIB), still not fully understood at the microscopic level. During the discharge cycle, LTO undergoes a phase transformation between Li4Ti5O12 and Li7Ti5O12 states within a cubic crystal lattice. To reveal the details of the microscopic mechanism, it is necessary to track the sequence of phase transformations at different discharge/charge states under operating conditions. Here, we use in situ Bragg coherent diffraction imaging (BCDI) and in situ X-ray diffraction (XRD) experiments to examine the lithium insertion-induced materials phase transformation within a single LTO particle and a bulk battery analogue, respectively. BCDI analysis from (111) Bragg peak shows the two-phase transformation manifesting as a distinct image phase modulation within a single LTO nanoparticle occurring in the middle of the discharge region then subsiding toward the end of the discharge cycle. We observe the biggest phase variation at the two-phase stage, indicating the formation of phase domains of 200 nm in size during the discharge process. We also observe a lattice contraction of >0.2% in a single LTO nanoparticle at the (400) Bragg peak measurement, larger than that in the corresponding bulk material. Our observation of this phase transformation at a single-particle level has implications for the understanding of the microscopic/mesoscale picture of the phase transformation in anode and cathode LIBs materials.
| Type: | Article |
|---|---|
| Title: | Imaging the Phase Transformation in Single Particles of the Lithium Titanate Anode for Lithium-Ion Batteries |
| Open access status: | An open access version is available from UCL Discovery |
| DOI: | 10.1021/acsaem.0c02010 |
| Publisher version: | https://doi.org/10.1021/acsaem.0c02010 |
| Language: | English |
| Additional information: | This is an open access article published under a Creative Commons Non-Commercial No Derivative Works (CC-BY-NC-ND) Attribution License, which permits copying and redistribution of the article, and creation of adaptations, all for non-commercial purposes. |
| Keywords: | coherent diffraction imaging, image phase variation, displacement field, battery material, lithium titanate anode |
| UCL classification: | UCL UCL > Provost and Vice Provost Offices > UCL BEAMS UCL > Provost and Vice Provost Offices > UCL BEAMS > Faculty of Maths and Physical Sciences UCL > Provost and Vice Provost Offices > UCL BEAMS > Faculty of Maths and Physical Sciences > London Centre for Nanotechnology |
| URI: | https://discovery.ucl.ac.uk/id/eprint/10121546 |
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