Duan, Ju; Wang, Wenting; Zou, Degui; Liu, Jing; Li, Na; Weng, Junying; Xu, Li-ping; Guan, Ying; Zhang, Yongjun; Zhou, Pengfei published the artcile< Construction of a Few-Layered COF@CNT Composite as an Ultrahigh Rate Cathode for Low-Cost K-Ion Batteries>, Category: esters-buliding-blocks, the main research area is covalent organic framework carbon nanotube potassium ion battery cathode; cathode materials; covalent organic frameworks; few-layered; potassium-ion batteries; ultrahigh rate performance.
Potassium-ion batteries (PIBs) are attracting great interest for large-scale energy storage owing to the abundant resources and low redox potential of K+/K. However, the large volume changes and slow kinetics caused by the larger ionic radius of K+ for cathode materials remain a critical challenge for PIBs. Herein, we construct few-layered covalent organic frameworks integrated with carboxylated carbon nanotubes (DAAQ-COF@CNT) as cathode materials for PIBs. The synthesized DAAQ-COF@CNT features numerous active sites, a stable conductive framework, and an appropriate surface area with nanopores, which can render high elec. conductivity, shorten the ion/electron diffusion distance, and accelerate K+ diffusion. In consequence, the DAAQ-COF@CNT delivers a high reversible capacity of 157.7 mAh g-1 at 0.1 A g-1, an excellent rate capability of 111.2 mAh g-1 at 1 A g-1, and a long cycling stability of 77.6% capacity retention after 500 cycles at 0.5 A g-1. The integrated characterization of ex situ XPS, Fourier transform IR spectroscopy, and theor. simulation discloses that the storage mechanism of DAAQ-COF@CNT is based on the reversible reaction between electroactive C=O groups and K+ during two successive steps. This work provides a promising high-performance cathode material for PIBs and encourages the development of new types of covalent organic frameworks for PIBs.
ACS Applied Materials & Interfaces published new progress about Activation energy. 112-63-0 belongs to class esters-buliding-blocks, and the molecular formula is C19H34O2, Category: esters-buliding-blocks.
Referemce:
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Ester – an overview | ScienceDirect Topics