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Controlled large-area lithium deposition to reduce swelling of high-energy lithium metal pouch cells in liquid electrolytes

Abstract

Lithium (Li) metal battery technology, renowned for its high energy density, faces practical challenges, particularly concerning large volume change and cell swelling. Despite the profound impact of external pressure on cell performance, there is a notable gap in research regarding the interplay between external pressure and the electroplating behaviours of Li+ in large-format pouch cells. Here we delve into the impact of externally applied pressure on electroplating and stripping of Li in 350 Wh kg−1 pouch cells. Employing a hybrid design, we monitor and quantify self-generated pressures, correlating them with observed charge–discharge processes. A two-stage cycling process is proposed, revealing controlled pouch cell swelling of less than 10%, comparable to state-of-the-art Li-ion batteries. The pressure distribution across the cell surface unveils a complex Li+ detour behaviour during electroplating, highlighting the need for innovative strategies to address uneven Li plating and enhance Li metal battery technology.

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Fig. 1: In situ pressure monitoring of three 350 Wh kg−1 Li/NMC622 pouch cells (2Ah) tested under different initial external pressure.
Fig. 2: Different stages of Li utilization in a Li/NMC622 pouch cell.
Fig. 3: Li metal pouch cells before and after extensive cycling under different initial pressures.
Fig. 4: Mapping of pressure distribution on the surface of a prototype 350 Wh kg−1 Li/NMC622 pouch cell (2Ah) during cycling and correlation to lithium metal morphologies after cycling.
Fig. 5: Experimental and theoretical study of Li+ detour behaviour during the electroplating process.

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Acknowledgements

This research has been supported by the Assistant Secretary for Energy Efficiency and Renewable Energy, Office of Vehicle Technologies of the US Department of Energy (DOE) through the Advanced Battery Materials Research Program (Battery500 Consortium). The SEM and TEM were conducted in the William R. Wiley Environmental Molecular Sciences Laboratory (EMSL), a national scientific user facility sponsored by DOE’s Office of Biological and Environmental Research and located at PNNL. PNNL is operated by Battelle for the DOE under contract DE-AC05-76RL01830. The authors thank Q. Zhao for performing the XPS measurements.

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Authors

Contributions

J.X. and Jun Liu proposed the research. Dianying Liu and B.W. designed experiments, performed the electrochemical measurements, characterized materials and analysed the data. Dianying Liu and B.W. contributed equally to this work. Y.X. performed the SEM and TEM. J.E, A.B. and Dianying Liu designed the pouch cell testing fixtures. Jun Liu, C.A. and K.B. helped to make the pouch cells. D.G.-A., K.-J.L., P.B.B. and J.M.S. performed the theoretical calculations. D.Q. and J.Y. contributed to the discussion and provided suggestions. J.X. and Jun Liu wrote the manuscript with input from all other co-authors.

Corresponding authors

Correspondence to Jun Liu or Jie Xiao.

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Nature Energy thanks Subrahmanyam Goriparti and the other, anonymous, reviewer(s) for their contribution to the peer review of this work.

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Supplementary Figs. 1–21 and Table 1.

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Supplementary Figs. 2c, 3, 5–7, 9–13, 18 and 19.

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Liu, D., Wu, B., Xu, Y. et al. Controlled large-area lithium deposition to reduce swelling of high-energy lithium metal pouch cells in liquid electrolytes. Nat Energy (2024). https://doi.org/10.1038/s41560-024-01488-9

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