Decoupling of mechanical properties and ionic conductivity in supramolecular lithium ion conductors

David G. Mackanic, Xuzhou Yan (), Qiuhong Zhang, Naoji Matsuhisa, Zhiao Yu, Yuanwen Jiang, Tuheen Manika, Jeffrey Lopez, Hongping Yan, Kai Liu, Xiaodong Chen, Yi Cui () and Zhenan Bao ()
Additional contact information
David G. Mackanic: Stanford University, Shriram Center
Xuzhou Yan: Shanghai Jiao Tong University
Qiuhong Zhang: Nanjing University
Naoji Matsuhisa: Stanford University, Shriram Center
Zhiao Yu: Stanford University, Shriram Center
Yuanwen Jiang: Stanford University, Shriram Center
Tuheen Manika: Stanford University, Shriram Center
Jeffrey Lopez: Stanford University, Shriram Center
Hongping Yan: Stanford University, Shriram Center
Kai Liu: Stanford University
Xiaodong Chen: Nanyang Technological University
Yi Cui: Stanford University
Zhenan Bao: Stanford University, Shriram Center

Nature Communications, 2019, vol. 10, issue 1, 1-11

Abstract: Abstract The emergence of wearable electronics puts batteries closer to the human skin, exacerbating the need for battery materials that are robust, highly ionically conductive, and stretchable. Herein, we introduce a supramolecular design as an effective strategy to overcome the canonical tradeoff between mechanical robustness and ionic conductivity in polymer electrolytes. The supramolecular lithium ion conductor utilizes orthogonally functional H-bonding domains and ion-conducting domains to create a polymer electrolyte with unprecedented toughness (29.3 MJ m−3) and high ionic conductivity (1.2 × 10−4 S cm−1 at 25 °C). Implementation of the supramolecular ion conductor as a binder material allows for the creation of stretchable lithium-ion battery electrodes with strain capability of over 900% via a conventional slurry process. The supramolecular nature of these battery components enables intimate bonding at the electrode-electrolyte interface. Combination of these stretchable components leads to a stretchable battery with a capacity of 1.1 mAh cm−2 that functions even when stretched to 70% strain. The method reported here of decoupling ionic conductivity from mechanical properties opens a promising route to create high-toughness ion transport materials for energy storage applications.

Date: 2019
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DOI: 10.1038/s41467-019-13362-4

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