首页|N,P co-doped 3D porous carbon with self-assembled morphological control via template-free method for potassium-ion battery anodes

N,P co-doped 3D porous carbon with self-assembled morphological control via template-free method for potassium-ion battery anodes

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The larger ionic radius of potassium ions than that of lithium ions significantly limits the accomplishment of rapid diffusion kinetics in graphite electrodes for potassium-ion batteries(PIBs),resulting in comparatively poor rate performance and cycle stability.Herein,we report a high-rate performance and cycling stability amorphous carbon electrode achieved through nitrogen and phosphorous co-doping.The as-prepared N,P co-doped carbon electrodes have distinct 3D structures with large surface areas,hierarchical pore architectures,and increased interlayer spaces resulting from the direct pyrolysis of supramolecular self-assembled aggregates without tem-plates.The obtained electrode N3P1 exhibits a reversible specific capacity of 258 mAh·g-1 at a current density of 0.1 A·g-1 and a good long-term cycle performance(96.1％capacity retention after 800 cycles at 0.5 A-g-1).Kinetic investigations show that the N3P1 electrode with the well-developed porous structure and large number of surface defects exhibits capacitive-driven behavior at all scan rates,which may be attributed by N and P co-doping.Ex-situ transmission electron microscopy analyses in the fully discharged and charged states demonstrate structural sta-bility and reversibility owing to the expanded interlayer space.The suggested synthesis approach is simple and effective for producing heteroatom-doped carbon materials for PIBs and other advanced electrochemical energy stor-age materials.

Amorphous carbons3D porous structuresNitrogen and phosphorous co-dopingPotassium-ion batteries

Jeehoon Yu、Dae Kyom Kim、Hong Geun Oh、Seung-Keun Park、Youngjae Yoo

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Department of Advanced Materials Engineering,Chung-Ang University,Anseong-si 17546,Republic of Korea

National Research Foundation of Korea(NRF)from Korean government(MSIT,Korea)Materials/Parts Technology Development Program from the Ministry of Trade,Industry,and Energy(MOTIE,Korea)

2023R1A2C100545920019205

2024

10.1007/s12598-024-02724-7

稀有金属(英文版)
中国有色金属学会

稀有金属(英文版)

CSTPCDEI
影响因子：0.801
ISSN：1001-0521
年,卷(期)：2024.43(9)
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