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Influence of Solvent Evaporation Rate in the Preparation of Carbon‐Coated Lithium Iron Phosphate Cathode Films on Battery Performance
Author(s) -
Gören Attila,
CíntoraJuárez Daniel,
Martins Pedro,
Ferdov Stanislav,
Silva Maria Manuela,
Tirado José Luís,
Costa Carlos M.,
LancerosMéndez Senentxu
Publication year - 2016
Publication title -
energy technology
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 0.91
H-Index - 44
eISSN - 2194-4296
pISSN - 2194-4288
DOI - 10.1002/ente.201500392
Subject(s) - lithium iron phosphate , cathode , materials science , dielectric spectroscopy , evaporation , battery (electricity) , chemical engineering , lithium (medication) , solvent , carbon fibers , cyclic voltammetry , polymer , microstructure , lithium battery , analytical chemistry (journal) , electrochemistry , composite material , electrode , chromatography , chemistry , organic chemistry , ion , medicine , power (physics) , physics , quantum mechanics , composite number , engineering , thermodynamics , endocrinology , ionic bonding
In this work, the drying step for cathodes based on carbon‐coated LiFePO 4 prepared in the temperature range of 60–120 °C has been investigated in detail. The microstructure of the cathode shows a homogeneous distribution of the active material and conductive additive particles independent of the drying temperature. However, the results of impedance spectroscopy and cycling voltammetry are affected by the drying temperature. The solvent evaporation temperature, therefore, affects the polymer binder distribution and its characteristics, which include the polar phase content of the polymer and its affinity with the other components of the cathode. The discharge capacity value after 50 cycles is 120 and 81 mAh g −1 for the samples dried at 80 and 60 °C, respectively, which show the best and worst battery performance, respectively. It was concluded that carbon‐coated LiFePO 4 cathodes should be prepared at drying temperatures between 80 and 100 °C for optimized performance.