A non-Newtonian fluid quasi-solid electrolyte designed for long life and high safety Li-O2 batteries

Guangli Zheng, Tong Yan, Yifeng Hong, Xiaona Zhang, Jianying Wu, Zhenxing Liang, Zhiming Cui, Li Du and Huiyu Song ()
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Guangli Zheng: South China University of Technology
Tong Yan: South China University of Technology
Yifeng Hong: South China University of Technology
Xiaona Zhang: South China University of Technology
Jianying Wu: South China University of Technology
Zhenxing Liang: South China University of Technology
Zhiming Cui: South China University of Technology
Li Du: South China University of Technology
Huiyu Song: South China University of Technology

Nature Communications, 2023, vol. 14, issue 1, 1-10

Abstract: Abstract The Li dendrite growth and the liquid electrolyte volatilization under semi-open architecture are intrinsic issues for Li-O2 battery. In this work, we propose a non-Newtonian fluid quasi-solid electrolyte (NNFQSE) SiO2-SO3Li/PVDF-HFP, which has both shear-thinning and shear-thickening properties. The component interactions among the sulfonated silica nanoparticles, liquid electrolyte, and polymer network are beneficial for decent Li+ conductivity and high liquid electrolyte retention without volatilization. Furthermore, NNFQSE exhibits shear-thinning property to eliminate the stress of dendrite growth during repeated cycling. Meanwhile, when the force suddenly increases, such as a high current rate, the NNFQSE may dynamically turn shear-thickening to respond and mechanically stiffen to inhibit the lithium dendrite penetration. By coupling with the NNFQSE, the lithium symmetrical battery can run over 2000 h under 1 mA cm−2 at room temperature, and the quasi-solid Li-O2 battery actualizes long life above 5000 h at 100 mA g−1.

Date: 2023
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DOI: 10.1038/s41467-023-37998-5

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