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Published on: November 11, 2013
Dual-Redox-Center Conjugated Microporous Polymers as Durable p-Type Cathode Enabling Hybrid Kinetics in Lithium
Wenyu Jiao1, Yuze Chen1, Wanhong Huang1
1State KeyLab of Inorganic Synthesis and Preparative Chemistry, College of Chemistry, Jilin University, Changchun 130012, P. R. China.
Abstract:
p-Type organic cathodes offer high operating voltages but are often limited by poor cyclability. To overcome this, herein, we successfully integrate two p-type redox centers, triphenylamine and phenazine, into conjugated microporous polymers (CMPs), denoted as CMP-TBDA-Pz and CMP-TBA-Pz. These materials demonstrate high voltages (>3.5 V vs Li+/Li), superior capacity, and excellent stability. Notably, the dual-redox centers endow the system with hybrid charge storage kinetics, balancing diffusion-controlled and pseudocapacitive behavior. As a result, CMP-TBDA-Pz delivers specific capacities of 219.4 mAh g-1 (0.1 A g-1) and 135.7 mAh g-1 (5 A g-1), corresponding to energy densities of 633 and 417 Wh kg-1, respectively. In graphite//CMP-TBDA-Pz full-cells, 97% capacity retention is achieved after 500 cycles at 2 A g-1. This work establishes a strategy for high-performance p-type cathodes via dual-site architecture to regulate hybrid kinetics.
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