Ladderphane copolymers for high-temperature capacitive energy storage

Jie Chen, Yao Zhou, Xingyi Huang (), Chunyang Yu, Donglin Han, Ao Wang, Yingke Zhu, Kunming Shi, Qi Kang, Pengli Li, Pingkai Jiang, Xiaoshi Qian, Hua Bao, Shengtao Li, Guangning Wu, Xinyuan Zhu and Qing Wang ()
Additional contact information
Jie Chen: Shanghai Jiao Tong University
Yao Zhou: The Pennsylvania State University
Xingyi Huang: Shanghai Jiao Tong University
Chunyang Yu: Shanghai Jiao Tong University
Donglin Han: Shanghai Jiao Tong University
Ao Wang: University of Michigan-Shanghai Jiao Tong University Joint Institute, Shanghai Jiao Tong University
Yingke Zhu: Shanghai Jiao Tong University
Kunming Shi: Shanghai Jiao Tong University
Qi Kang: Shanghai Jiao Tong University
Pengli Li: Shanghai Jiao Tong University
Pingkai Jiang: Shanghai Jiao Tong University
Xiaoshi Qian: Shanghai Jiao Tong University
Hua Bao: University of Michigan-Shanghai Jiao Tong University Joint Institute, Shanghai Jiao Tong University
Shengtao Li: Xi’an Jiaotong University
Guangning Wu: Southwest Jiaotong University
Xinyuan Zhu: Shanghai Jiao Tong University
Qing Wang: The Pennsylvania State University

Nature, 2023, vol. 615, issue 7950, 62-66

Abstract: Abstract For capacitive energy storage at elevated temperatures1–4, dielectric polymers are required to integrate low electrical conduction with high thermal conductivity. The coexistence of these seemingly contradictory properties remains a persistent challenge for existing polymers. We describe here a class of ladderphane copolymers exhibiting more than one order of magnitude lower electrical conductivity than the existing polymers at high electric fields and elevated temperatures. Consequently, the ladderphane copolymer possesses a discharged energy density of 5.34 J cm−3 with a charge–discharge efficiency of 90% at 200 °C, outperforming the existing dielectric polymers and composites. The ladderphane copolymers self-assemble into highly ordered arrays by π–π stacking interactions5,6, thus giving rise to an intrinsic through-plane thermal conductivity of 1.96 ± 0.06 W m−1 K−1. The high thermal conductivity of the copolymer film permits efficient Joule heat dissipation and, accordingly, excellent cyclic stability at elevated temperatures and high electric fields. The demonstration of the breakdown self-healing ability of the copolymer further suggests the promise of the ladderphane structures for high-energy-density polymer capacitors operating under extreme conditions.

Date: 2023
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DOI: 10.1038/s41586-022-05671-4

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