Redox-homogeneous, gel electrolyte-embedded high-mass-loading cathodes for high-energy lithium metal batteries

Jung-Hui Kim, Ju-Myung Kim, Seok-Kyu Cho, Nag-Young Kim and Sang-Young Lee ()
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Jung-Hui Kim: Ulsan National Institute of Science and Technology (UNIST)
Ju-Myung Kim: Ulsan National Institute of Science and Technology (UNIST)
Seok-Kyu Cho: Ulsan National Institute of Science and Technology (UNIST)
Nag-Young Kim: Yonsei University
Sang-Young Lee: Yonsei University

Nature Communications, 2022, vol. 13, issue 1, 1-11

Abstract: Abstract Lithium metal batteries have higher theoretical energy than their Li-ion counterparts, where graphite is used at the anode. However, one of the main stumbling blocks in developing practical Li metal batteries is the lack of cathodes with high-mass-loading capable of delivering highly reversible redox reactions. To overcome this issue, here we report an electrode structure that incorporates a UV-cured non-aqueous gel electrolyte and a cathode where the LiNi0.8Co0.1Mn0.1O2 active material is contained in an electron-conductive matrix produced via simultaneous electrospinning and electrospraying. This peculiar structure prevents the solvent-drying-triggered non-uniform distribution of electrode components and shortens the time for cell aging while improving the overall redox homogeneity. Moreover, the electron-conductive matrix eliminates the use of the metal current collector. When a cathode with a mass loading of 60 mg cm−2 is coupled with a 100 µm thick Li metal electrode using additional non-aqueous fluorinated electrolyte solution in lab-scale pouch cell configuration, a specific energy and energy density of 321 Wh kg−1 and 772 Wh L−1 (based on the total mass of the cell), respectively, can be delivered in the initial cycle at 0.1 C (i.e., 1.2 mA cm−2) and 25 °C.

Date: 2022
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DOI: 10.1038/s41467-022-30112-1

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