Daqing Peng

China University of Mining and Technology

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Heli Ma

Liaoning University

Yaxin Chen

China University of Mining and Technology

Quanchao Zhuang

China University of Mining and Technology

Zhicheng Ju

China University of Mining and Technology

Yueli Shi

China University of Mining and Technology

Xueni Chen

University of Colorado Denver

Denghu Wei

Liaocheng University

Xiujun Qi

China University of Mining and Technology

Lei Zhang

Nantong University

Yi Hu

Nanyang Technological University

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China University of Mining and Technology

Xuzhou University of Technology

University of Science and Technology of China

Hefei National Center for Physical Sciences at Nanoscale

Tsinghua University

Xinjiang University

China Academy of Engineering Physics

Xiamen University

Zhejiang University

Fourth Affiliated Hospital of Anhui Medical University

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Enhancing the Cycling Stability by Tuning the Chemical Bonding between Phosphorus and Carbon Nanotubes for Potassium-Ion Battery Anodes

ACS Applied Materials & Interfaces (2020)

Daqing Peng Yaxin Chen Heli Ma Lei Zhang Yi Hu

Phosphorus/carbon (P/C) composites as promising potassium-ion storage materials have been extensively investigated for its compound superiorities of high specific capacity and favorable electronic conductivity. However, the effects of different chemical bonding states between P and the carbon matrix for potassium-ion storage and cycling performance still need to be investigated. Herein, three P/C composites with different chemical bonding states were successfully fabricated through simply ball-milling red P with carboxylic group carbon nanotubes (CGCNTs), carbon nanotubes (CNTs), and reduced carboxylic group carbon nanotubes (RCGCNTs), respectively. When used as potassium-ion battery (PIB) anodes, the red P and CGCNT (P-CGCNT) composite deliver the most outstanding cycling stability (402.6 mAh g-1 over 110 cycles) with a favorable capacity retention of 68.26% at a current density of 0.1 A g-1, much higher than that of the phosphorus-CNT (P-CNT) composite (297.5 mAh g-1 and 50.40%). Based on the results of X-ray photoelectron spectroscopy and electrochemical performance, we propose that the existence of a carboxyl functional group will be instrumental for the formation of the P-O-C bond. More importantly, when compared with the P-C bond, the P-O-C bond can lead to a higher reversible capacity and a better long-term cycling stability as a result of the more robust bonding energy of the P-O-C bond (585 KJ mol-1) than that of the P-C bond (264 kJ mol-1). This work provides some insights into designing high-performance P anodes for PIBs.

Potassium-ion battery

Carbon fibers

10.1021/acsami.0c11577

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Novel Fabrication Of N/S Co‐doped Hierarchically Porous Carbon For Potassium‐Ion Batteries

ChemistrySelect (2019)

Heli Ma Xiujun Qi Daqing Peng Yaxin Chen Denghu Wei

Abstract It has been demonstrated that embedding potassium ions into graphitic carbon is viable. However, the large ionic radius of potassium‐ions is a severe obstacle of potassium‐ion transmission between the cathode and anode. Therefore, it is urgent to find an electrode material with larger interlayer spacing to facilitate potassium‐ion intercalation/deintercalation. Herein, hierarchically nitrogen and sulfur co‐doped porous carbon (NSPC) have been prepared with sodium polyacrylate as the carbon precursor and sodium chloride as the template. When used as the anode materials for PIBs, NSPC shows reversible capacities of 289.7 mAh g −1 after 70 cycles at 50 mA g −1 and 156.8 mAh g −1 after 1000 cycles at 500 mA g −1 . The high reversible capacity and excellent cyclic performance of NSPC can be ascribed to the three‐dimensional structure with nitrogen and sulfur co‐doping, which improves electronic conductivity and enlarged interlayer spacing, facilitating potassium‐ion insertion. This work provides some insights into the fabrication of heteroatom‐doped carbon materials and is helpful for the design of high‐performance anode materials for PIBs.

Carbon fibers

Heteroatom

10.1002/slct.201903244

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Citations (38)