Bioinspired design of Na-ion conduction channels in covalent organic frameworks for quasi-solid-state sodium batteries

Yingchun Yan, Zheng Liu (), Ting Wan, Weining Li, Zhipeng Qiu, Chunlei Chi, Chao Huangfu, Guanwen Wang, Bin Qi, Youguo Yan (), Tong Wei and Zhuangjun Fan ()
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Yingchun Yan: China University of Petroleum
Zheng Liu: China University of Petroleum
Ting Wan: China University of Petroleum
Weining Li: China University of Petroleum
Zhipeng Qiu: China University of Petroleum
Chunlei Chi: China University of Petroleum
Chao Huangfu: China University of Petroleum
Guanwen Wang: China University of Petroleum
Bin Qi: China University of Petroleum
Youguo Yan: China University of Petroleum
Tong Wei: China University of Petroleum
Zhuangjun Fan: China University of Petroleum

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

Abstract: Abstract Solid polymer electrolytes are considered among the most promising candidates for developing practical solid-state sodium batteries. However, moderate ionic conductivity and narrow electrochemical windows hinder their further application. Herein, inspired by the Na+/K+ conduction in biological membranes, we report a (–COO–)-modified covalent organic framework (COF) as a Na-ion quasi-solid-state electrolyte with sub-nanometre-sized Na+ transport zones (6.7–11.6 Å) created by adjacent –COO– groups and COF inwalls. The quasi-solid-state electrolyte enables selective Na+ transport along specific areas that are electronegative with sub-nanometre dimensions, resulting in a Na+ conductivity of 1.30×10–4 S cm–1 and oxidative stability of up to 5.32 V (versus Na+/Na) at 25 ± 1 °C. Testing the quasi-solid-state electrolyte in Na||Na3V2(PO4)3 coin cell configuration demonstrates fast reaction dynamics, low polarization voltages, and a stable cycling performance over 1000 cycles at 60 mA g–1 and 25 ± 1 °C with a 0.0048% capacity decay per cycle and a final discharge capacity of 83.5 mAh g−1.

Date: 2023
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DOI: 10.1038/s41467-023-38822-w

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