117 research outputs found
Solid Oxide Electrolysis Cells: Microstructure and Degradation of the Ni/Yttria-Stabilized Zirconia Electrode
A TEM study of morphological and structural degradation phenomena in LiFePO<sub>4</sub>-CB cathodes:Morphological and structural degradation in LiFePO4-CB cathodes
LiFePO4-based cathodes suffer from various degradation mechanisms which
influences the battery performance. In this paper morphological and structural
degradation phenomena in laboratory cathodes made of LiFePO4 (LFP) mixed with
carbon black (CB) in an 1 mol L-1 LiPF6 in EC:DMC (1:1 by weight) electrolyte
are investigated by transmission electron microscopy (TEM) at various
preparation, assembling, storage and cycling stages. High-resolution TEM
(HRTEM) imaging shows that continuous SEI layers are formed on the LFP
particles and that both storage and cycling affects the formation. Additionally
loss of CB crystallinity, CB aggregation and agglomeration is observed.
Charge-discharge curves and impedance spectra measured during cycling confirm
that these degradation mechanisms reduce the cathode conductivity and capacity.Comment: 5 figures, 2 table, journal article in International Journal of
Energy Research, 201
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