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Fast-chargeable lithium-ion batteries by μ-Si anode-tailored full-cell design

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Authors

Lee, Taeyong; Seong, Min Ji; Ahn, Hyo Chul; Baek, Minsung; Park, Kiho; Oh, Jihoon; Choi, Taehoon; Choi, Jang Wook

Issue Date
2024-12
Publisher
National Academy of Sciences
Citation
Proceedings of the National Academy of Sciences of the United States of America, Vol.122 No.1, p. e2417053121
Abstract
Silicon (Si) anodes have long been recognized to significantly improve the energy density and fast-charging capability of lithium-ion batteries (LIBs). However, the implementation of these anodes in commercial LIB cells has progressed incrementally due to the immense volume change of Si across its full state-of-charge (SOC) range. Here, we report an anode-tailored full-cell design (ATFD), which incorporates micrometer-sized silicon (μ-Si) alone, for operation over a limited, prespecified SOC range identified as 30-70%. This range allows homogeneous (de)lithiation throughout the electrode, accompanied by an acceptable level of volume change. The ATFD-based cell exhibits 21.3% higher gravimetric energy density than that of its graphite-based counterpart in a commercial 18650 cylindrical cell and 84.6% capacity retention after 500 cycles even at a fast-charging rate of 3 C. This study indicates that the partial, intermediate SOC operation of the μ-Si anode can markedly increase the energy density and boost the fast-charging capability of a LIB cell, a challenging task in traditional cell engineering.
ISSN
0027-8424
URI
https://hdl.handle.net/10371/216462
DOI
https://doi.org/10.1073/pnas.2417053121
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  • College of Engineering
  • School of Chemical and Biological Engineering
Research Area Physics, Materials Science

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