Single organic electrode for multi-system dual-ion symmetric batteries

Wenjun Li, Huilin Ma, Wu Tang (), Kexin Fan, Shan Jia, Jian Gao (), Ming Wang, Yan Wang (), Bei Cao and Cong Fan ()
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Wenjun Li: University of Electronic Science and Technology of China (UESTC)
Huilin Ma: University of Electronic Science and Technology of China (UESTC)
Wu Tang: University of Electronic Science and Technology of China (UESTC)
Kexin Fan: University of Electronic Science and Technology of China (UESTC)
Shan Jia: University of Electronic Science and Technology of China (UESTC)
Jian Gao: Sichuan Changhong Electronic (Group) Co.; Ltd
Ming Wang: Sichuan Changhong Electronic (Group) Co.; Ltd
Yan Wang: University of Electronic Science and Technology of China (UESTC)
Bei Cao: The Chinese University of Hong Kong
Cong Fan: University of Electronic Science and Technology of China (UESTC)

Nature Communications, 2024, vol. 15, issue 1, 1-12

Abstract: Abstract The large void space of organic electrodes endows themselves with the capability to store different counter ions without size concern. In this work, a small-molecule organic bipolar electrode called diquinoxalino[2,3-a:2’,3’-c]phenazine-2,6,10-tris(phenoxazine) (DQPZ-3PXZ) is designed. Based on its robust solid structure by the π conjugation of diquinoxalino[2,3-a:2’,3’-c]phenazine (DQPZ) and phenoxazine (PXZ), DQPZ-3PXZ can indiscriminately and stably host 5 counter ions with different charge and size (Li+, Na+, K+, PF6− and FSI−). In Li/Na/K-based half cells, DQPZ-3PXZ can deliver the peak discharge capacities of 257/243/253 mAh g−1cathode and peak energy densities of 609/530/572 Wh kg−1cathode, respectively. The Li/Na/K-based dual-ion symmetric batteries can be constructed, which can be activated through the 1st charge process and show the stable discharge capacities of 85/66/72 mAh g−1cathode and energy densities of 59/50/52 Wh kg−1total mass, all running for more than 15000 cycles with nearly 100% capacity retention.

Date: 2024
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DOI: 10.1038/s41467-024-53803-3

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