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Busson, C., Blin, M. .-A., Guichard, P., Soudan, P., Crosnier, O., Guyomard, D. & Lestriez, B. (2018) A primed current collector for high performance carbon-coated LiFePO4 electrodes with no carbon additive. J. Power Sources, 406 7–17.
Added by: Richard Baschera (2018-12-20 09:04:18) Last edited by: Richard Baschera (2018-12-20 09:08:05) |
| Type de référence: Article DOI: 10.1016/j.jpowsour.2018.10.018 Numéro d'identification (ISBN etc.): 0378-7753 Clé BibTeX: Busson2018 Voir tous les détails bibliographiques  |
Catégories: IMN, ST2E Mots-clés: aluminum current collector, C-LiFePO4, Carbon additives, contact resistance, corrosion, cu current collector, Current collector, Electrochemical performance, high-power, li4ti5o12 anode, Lithium-ion batteries, low-cost, Positive electrode, Primer, Surface Créateurs: Blin, Busson, Crosnier, Guichard, Guyomard, Lestriez, Soudan Collection: J. Power Sources |
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This work shows that newly developed primed aluminum current collector for positive electrodes allows to vastly improve the electrochemical performance compared to bare aluminum foil for full cells assembled with a C-coated LiFePO4 positive electrode, a graphite negative electrode and a standard carbonate/LiPF6 based electrolyte. Moreover, it is discovered that using a primed collector allows to drastically reduce the carbon additive content in the C-LiFePO4 electrode down to zero, while maintaining a very low impedance and excellent rate capability (80 mAh/g at 5C rate) and cyclability (60% capacity retention after 200 cycles at 2C rate). Comparatively, the same electrode shows no cyclability in the same testing conditions if a bare aluminum foil is used as the collector. Improving the energy density while maintaining good power capability of a Li-ion cell was thus achieved by using an adapted primed current collector. Such performance originates from a significant reduction of the contact resistance at the current collector - electrode interface through the multiplication of electrical contact points and/or the modification of their nature. In complement, this work shows that the carbon coating of the C-LiFePO4 particles is sufficient to ensure a good electrical conductivity within the electrode.
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