4.7 Article

Constructing mild expanded graphite microspheres by pressurized oxidation combined microwave treatment for enhanced lithium storage

期刊

RARE METALS
卷 40, 期 4, 页码 837-847

出版社

NONFERROUS METALS SOC CHINA
DOI: 10.1007/s12598-020-01625-9

关键词

Pressurized oxidation; Microwave treatment; Mild expanded graphite microspheres; Microstructure; Graphitic anode material; Lithium-ion battery

资金

  1. National Natural Science Foundation of China [51702191, 51802325, U1510134]
  2. Natural Science Foundation of Shanxi Province, China [201901D111037]
  3. Scientific Research Foundation for Young Scientists of Shanxi Province, China [201901D211585]
  4. Science and Technology Innovation Planning Project in Universities and Colleges of Shanxi Province of China [2019L0012]
  5. Unveiling Bidding Projects of Shanxi Province, China [20191101008]
  6. Shanxi 1331 Project Key Innovative Research Team

向作者/读者索取更多资源

A novel method has been proposed to synthesize microsphere graphite materials with excellent electrochemical properties and application potential.
The modified graphite anode materials have some prominent advantages over other anode materials in the industrial applications. A novel simple and gentle method is proposed to synthesize the mild expanded graphite microspheres (MEGMs) from flake graphite spheres through a combined modified pressurized oxidation combined with the microwave treatment. The microstructural results demonstrate that moderately expanded MEGMs with an expansion volume between 4 and 10 ml center dot g(-1) exhibit a highly microporous structure with an enlarged interlayer spacing, a decreased microcrystalline size, as well as an increased number of functional groups on the surface, resulting in the increased storage sites and spaces for lithium ions and the enhanced diffusion rate of lithium ions. When used as the anode material for lithium-ion batteries, the MEGM-T75t30 obtained by oxidation treatment at 75 degrees C for 30 min followed by microwave irradiation for expansion displays a high reversible capacity of 446.7 mAh.g(-1) at 100 mA.g(-1) after 100 cycles and excellent rate performance (330 and 116 mAh.g(-1) at 800 and 3200 mA.g(-1), respectively). Therefore, the MEGMs prepared by this convenient and mild method show excellent electrochemical properties and good application potential. Graphic abstract

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