Complementary Ion Beam Analysis and Raman Studies for Investigation of the Carbon Coating Impact on Li Insertion/Deinsertion Process at LiFePO4/C Electrodes. Issue 14 (16th November 2017)

• Record Type: Journal Article
• Authors: Surblé, Suzy; Habrioux, Aurélien; Paireau, Cyril; Berger, Pascal; Khodja, Hicham; Neff, Delphine; Gosset, Dominique; Mailley, Sophie; Patoux, Sébastien
• Is Part Of: Journal of the Electrochemical Society. Volume 164:Issue 14(2017)
• Page Start: A3538
• Page End: A3544
• Publication Date: 2017-11-16
• Subjects: carbon coating -- Nuclear microprobe -- Raman spectroscopy; Electrochemistry -- Periodicals; 541.3705
• DOI: 10.1149/2.0471714jes
• Languages: English
• ISSNs: 0013-4651

Abstract

Abstract : Electrode materials were prepared using two commercial C-LiFePO4 powders (called hereafter LFP-A and LFP-B). The nature and the thickness of carbon coating have been characterized by Raman spectroscopy and Transmission Electron Microscopy. The carbon coating of the LFP-B is more graphitized than LFP-A, which appears amorphous. The lithium distribution of these electrodes is investigated using ion beam techniques as a function of its state of charge (SOC). The nuclear microanalyses reveal the presence of different dopings in the active materials (Ti or V). A layer richer in carbon (in addition to the composite electrode) is systematically observed on LFP-A pristine and cycled electrodes. In both materials, immobilization of lithium is visible. Higher content of lithium was observed for the LFP-B electrode.