Towards maximized volumetric capacity via pore-coordinated design for large-volume-change lithium-ion battery anodes

Jiyoung Ma, Jaekyung Sung, Jaehyung Hong, Sujong Chae, Namhyung Kim, Seong-Hyeon Choi, Gyutae Nam, Yoonkook Son, Sung Youb Kim (), Minseong Ko () and Jaephil Cho ()
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Jiyoung Ma: Ulsan National Institute of Science and Technology (UNIST)
Jaekyung Sung: Ulsan National Institute of Science and Technology (UNIST)
Jaehyung Hong: Ulsan National Institute of Science and Technology (UNIST)
Sujong Chae: Ulsan National Institute of Science and Technology (UNIST)
Namhyung Kim: Ulsan National Institute of Science and Technology (UNIST)
Seong-Hyeon Choi: Ulsan National Institute of Science and Technology (UNIST)
Gyutae Nam: Ulsan National Institute of Science and Technology (UNIST)
Yoonkook Son: Chosun University
Sung Youb Kim: Ulsan National Institute of Science and Technology (UNIST)
Minseong Ko: Pukyong National University
Jaephil Cho: Ulsan National Institute of Science and Technology (UNIST)

Nature Communications, 2019, vol. 10, issue 1, 1-10

Abstract: Abstract To achieve the urgent requirement for high volumetric energy density in lithium-ion batteries, alloy-based anodes have been spotlighted as next-generation alternatives. Nonetheless, for the veritable accomplishment with regards to high-energy demand, alloy-based anodes must be evaluated considering several crucial factors that determine volumetric capacity. In particular, the electrode swelling upon cycling must be contemplated if these anodes are to replace conventional graphite anodes in terms of volumetric capacity. Herein, we propose macropore-coordinated graphite-silicon composite by incorporating simulation and mathematical calculation of numerical values from experimental data. This unique structure exhibits minimized electrode swelling comparable to conventional graphite under industrial electrode fabrication conditions. Consequently, this hybrid anode, even with high specific capacity (527 mAh g−1) and initial coulombic efficiency (93%) in half-cell, achieves higher volumetric capacity (493.9 mAh cm−3) and energy density (1825.7 Wh L−1) than conventional graphite (361.4 mAh cm−3 and 1376.3 Wh L−1) after 100 cycles in the full-cell configuration.

Date: 2019
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DOI: 10.1038/s41467-018-08233-3

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