Journal
JOURNAL OF POWER SOURCES
Volume 304, Issue -, Pages 24-32Publisher
ELSEVIER SCIENCE BV
DOI: 10.1016/j.jpowsour.2015.10.086
Keywords
3D battery; Ultrafast laser; Laser structuring; Cyclic voltammetry; LiFePO4
Funding
- Portfolio Project within the Helmholtz Gemeinschaft [43.98.30]
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Lithium iron phosphate is a promising cathode material for lithium-ion batteries, despite its low electrical conductivity and lithium-ion diffusion kinetic. To overcome the reduced rate performance, three dimensional (3D) architectures were generated in composite cathode layers. By using ultrashort laser radiation with pulse durations in the femtosecond regime the ablation depth per pulse is three times higher compared to nanosecond laser pulses. Due to the 3D structuring, the surface area of the active material which is in direct contact with liquid electrolyte, i.e. the active surface, is increased. As a result the capacity retention and the cycle stability were significantly improved, especially for high charging/discharging currents. Furthermore, a 3D structure leads to higher currents during cyclic voltammetry. Thus, the lithium-ion diffusion kinetic in the cell was improved. In addition, using ultrashort laser pulses results in a high aspect ratio and further improvement of the cell kinetic was achieved. (C) 2015 Elsevier B.V. All rights reserved.
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