Abstract
Void formation at the Li/ceramic electrolyte interface of an all-solid-state battery on discharge results in high local current densities, dendrites on charge, and cell failure. Here, we show that such voiding is reduced at the Li/Li6PS5Cl interface at elevated temperatures, sufficient to increase the critical current before voiding and cell failure from <0.25 mA cm-2 at 25 °C to 0.25 mA cm-2 at 60 °C and 0.5 mA cm-2 at 80 °C under a relatively low stack-pressure of 1 MPa. Increasing the stack-pressure to 5 MPa and temperature to 80 °C permits stable cycling at 2.5 mA cm-2. It is also shown that the charge-transfer resistance at the Li/Li6PS5Cl interface depends on pressure and temperature, with relatively high pressures required to maintain low charge-transfer resistance at -20 °C. These results are consistent with the plastic deformation of Li metal dominating the performance of the Li anode, posing challenges for the implementation of solid-state cells with Li anodes.
Original language | English |
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Pages (from-to) | 22708-22716 |
Number of pages | 9 |
Journal | ACS Applied Materials and Interfaces |
Volume | 13 |
Issue number | 19 |
Early online date | 7 May 2021 |
DOIs | |
Publication status | Published - 19 May 2021 |
Bibliographical note
Funding Information:P.G.B. is indebted to the Engineering and Physical Sciences Research Council (EPSRC) [EP/M009521/1], the Henry Royce Institute for Advanced Materials [EP/R00661X/1, EP/S019367/1, EP/R010145/1], and the Faraday Institution [FIRG007, FIRG008] for financial support. The X-ray tomography facilities were funded by EPSRC Grant [EP/M02833X/1] “University of Oxford: experimental equipment upgrade”.
Publisher Copyright:
© 2021 American Chemical Society.
Keywords
- interfaces
- lithium anode
- solid-state battery
- temperature dependence
- X-ray tomography
ASJC Scopus subject areas
- General Materials Science