Mechanical rolling formation of interpenetrated lithium metal/lithium tin alloy foil for ultrahigh-rate battery anode

Mintao Wan, Sujin Kang, Li Wang, Hyun-Wook Lee, Guangyuan Wesley Zheng, Yi Cui () and Yongming Sun ()
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Mintao Wan: Huazhong University of Science and Technology (HUST)
Sujin Kang: Ulsan National Institute of Science and Technology (UNIST), 50 UNIST-gil
Li Wang: Tsinghua University
Hyun-Wook Lee: Ulsan National Institute of Science and Technology (UNIST), 50 UNIST-gil
Guangyuan Wesley Zheng: Institute of Materials Research and Engineering, A*STAR, 2 Fusionopolis Way, Innovis
Yi Cui: Stanford University
Yongming Sun: Huazhong University of Science and Technology (HUST)

Nature Communications, 2020, vol. 11, issue 1, 1-10

Abstract: Abstract To achieve good rate capability of lithium metal anodes for high-energy-density batteries, one fundamental challenge is the slow lithium diffusion at the interface. Here we report an interpenetrated, three-dimensional lithium metal/lithium tin alloy nanocomposite foil realized by a simple calendering and folding process of lithium and tin foils, and spontaneous alloying reactions. The strong affinity between the metallic lithium and lithium tin alloy as mixed electronic and ionic conducting networks, and their abundant interfaces enable ultrafast charger diffusion across the entire electrode. We demonstrate that a lithium/lithium tin alloy foil electrode sustains stable lithium stripping/plating under 30 mA cm−2 and 5 mAh cm−2 with a very low overpotential of 20 mV for 200 cycles in a commercial carbonate electrolyte. Cycled under 6 C (6.6 mA cm−2), a 1.0 mAh cm−2 LiNi0.6Co0.2Mn0.2O2 electrode maintains a substantial 74% of its capacity by pairing with such anode.

Date: 2020
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DOI: 10.1038/s41467-020-14550-3

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