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Nano Research 2022, 15(6): 5153-5160 https://doi.org/10.1007/s12274-022-4183-z
Research Article | Issue | Published: 29 March 2022

A highly ionic conductive succinonitrile-based composite solid electrolyte for lithium metal batteries

Show Author's Information Genrui Qiu1,2,  Yapeng Shi1,2,  Bolong Huang1,2,3( )
CAS Center for Excellence in Nanoscience, Beijing Institute of Nanoenergy and Nanosystems, Chinese Academy of Sciences, Beijing 100083, China
School of Nanoscience and Technology, University of Chinese Academy of Sciences, Beijing 100049, China
Department of Applied Biology and Chemical Technology, The Hong Kong Polytechnic University, Hung Hom, Kowloon, Hong Kong 999077, China
Keywords:
ionic conductivity, mechanical strength, Li metal batteries, composite solid-state electrolyte, succinonitrile
Topics:
Lithium batteries
Cite this article:
Qiu G, Shi Y, Huang B. A highly ionic conductive succinonitrile-based composite solid electrolyte for lithium metal batteries. Nano Research, 2022, 15(6): 5153-5160. https://doi.org/10.1007/s12274-022-4183-z
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Abstract Full text Electronic supplementary material About this article

Solid-state Li metal batteries with solid electrolytes have built a potential way to solve the safety and low energy density problems of current commercial Li-ion batteries with liquid electrolyte. As a key component of solid-state Li metal batteries, solid electrolytes require high ionic conductivities and good mechanical properties. We have designed a composite solid electrolyte (CSE) consisting of poly(vinylidene fluoride-hexafluoropropylene) (PVDF-HFP)-Li6.5La3Zr1.5Ta0.5O12 (LLZTO)-succinonitrile (SN) and Li bis(trifluoromethylsulphonyl)imide (LiTFSI). The PVDF-HFP-based porous matrix made by electrospinning ensures good mechanical properties of the electrolyte membrane, and the large proportion of SN filling material makes the electrolyte membrane have an ionic conductivity of 1.11 mS·cm–1 without the addition of liquid electrolyte. The symmetric battery assembled with CSE can be cycled stably for more than 600 h, and the LiFePO4|CSE|Li full battery can also be cycled stably for more than 200 cycles. In addition to Li metal batteries, Li-O2 and Li-CO2 batteries that use CSE as electrolytes also have good performances, reflecting the universality of CSE. CSE does not only guarantee good mechanical properties but also obtain a high ionic conductivity. This design provides a new idea for the commercial application of polymer-based solid batteries.


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About this article

A highly ionic conductive succinonitrile-based composite solid electrolyte for lithium metal batteries

Show Author's information Genrui Qiu1,2, Yapeng Shi1,2, Bolong Huang1,2,3( )
CAS Center for Excellence in Nanoscience, Beijing Institute of Nanoenergy and Nanosystems, Chinese Academy of Sciences, Beijing 100083, China
School of Nanoscience and Technology, University of Chinese Academy of Sciences, Beijing 100049, China
Department of Applied Biology and Chemical Technology, The Hong Kong Polytechnic University, Hung Hom, Kowloon, Hong Kong 999077, China

Abstract

Solid-state Li metal batteries with solid electrolytes have built a potential way to solve the safety and low energy density problems of current commercial Li-ion batteries with liquid electrolyte. As a key component of solid-state Li metal batteries, solid electrolytes require high ionic conductivities and good mechanical properties. We have designed a composite solid electrolyte (CSE) consisting of poly(vinylidene fluoride-hexafluoropropylene) (PVDF-HFP)-Li6.5La3Zr1.5Ta0.5O12 (LLZTO)-succinonitrile (SN) and Li bis(trifluoromethylsulphonyl)imide (LiTFSI). The PVDF-HFP-based porous matrix made by electrospinning ensures good mechanical properties of the electrolyte membrane, and the large proportion of SN filling material makes the electrolyte membrane have an ionic conductivity of 1.11 mS·cm–1 without the addition of liquid electrolyte. The symmetric battery assembled with CSE can be cycled stably for more than 600 h, and the LiFePO4|CSE|Li full battery can also be cycled stably for more than 200 cycles. In addition to Li metal batteries, Li-O2 and Li-CO2 batteries that use CSE as electrolytes also have good performances, reflecting the universality of CSE. CSE does not only guarantee good mechanical properties but also obtain a high ionic conductivity. This design provides a new idea for the commercial application of polymer-based solid batteries.

Keywords: ionic conductivity, mechanical strength, Li metal batteries, composite solid-state electrolyte, succinonitrile

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Publication history
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Acknowledgements

Publication history

Received: 22 December 2021
Revised: 18 January 2022
Accepted: 20 January 2022
Published: 29 March 2022
Issue date: April 2022

Copyright

© Tsinghua University Press 2022

Acknowledgements

Acknowledgements

The authors gratefully acknowledge the support from the National Key R&D Program of China (No. 2021YFA1501101), the National Natural Science Foundation of China (No. 21771156), the National Natural Science Foundation of China/RGC Joint Research Scheme (No. N_PolyU502/21), and the funding for Projects of Strategic Importance of The Hong Kong Polytechnic University (Project Code: 1-ZE2V).

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