Nitrogen-doped graphene guided formation of monodisperse microspheres of LiFePO4 nanoplates as the positive electrode material of lithium-ion batteries

Yingke Zhou, Jiming Lu, Chengji Deng, Hongxi Zhu, George Z. Chen, Shaowei Zhang, Xiaohui Tian

Research output: Journal PublicationArticlepeer-review

66 Citations (Scopus)
7 Downloads (Pure)

Abstract

Three-dimensional porous composite microspheres of LiFePO4 and nitrogen doped graphene have been synthesized by a solvothermal process coupled with subsequent calcination. The morphologies and microstructures of the composites are investigated by scanning electron microscopy, X-ray diffraction, transmission electron microscopy and X-ray photoelectron spectroscopy. The electrochemical properties are evaluated by constant current charge/discharge tests, cyclic voltammetry and electrochemical impedance spectroscopy. The unique porous structure of the microspheres is constructed by the assembly of nitrogen-doped graphene and LiFePO4 nanoplates, and can remarkably enlarge the electrode/electrolyte interface area, facilitate the electron transfer process, shorten the ionic diffusion path and accelerate the ionic transport throughout the electrode. In electrochemical measurements of specific charge capacity, rate capability and cycling stability, the obtained porous composite microsphere materials offer remarkably promising results for application in high-performance lithium-ion power batteries.
Original languageEnglish
Pages (from-to)11959-12342
JournalJournal of Materials Chemistry A
Volume4
Issue number31
Early online date16 May 2016
DOIs
Publication statusPublished - 21 Aug 2016

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