Cycling-induced stress in lithium ion negative electrodes: LiAl/LiFePO4 and Li4Ti5O12/LiFePO4 cells |
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Authors: | J. Morales S. Franger |
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Affiliation: | a Departamento de Química Inorgánica e Ingeniería Química, Edificio Marie Curie, Campus de Rabanales, Universidad de Córdoba, 14071 Córdoba, Spain b Laboratoire de Physico-Chimie de l’Etat Solide, ICMMO (UMR CNRS 8182), Université Paris XI, 91405 Orsay, Orsay, France |
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Abstract: | In this work, we examined the electrochemical behaviour of lithium ion batteries containing lithium iron phosphate as the positive electrode and systems based on Li-Al or Li-Ti-O as the negative electrode. These two systems differ in their potential versus the redox couple Li+/Li and in their morphological changes upon lithium insertion/deinsertion. Under relatively slow charge/discharge regimes, the lithium-aluminium alloys were found to deliver energies as high as 438 Wh kg−1 but could withstand only a few cycles before crumbling, which precludes their use as negative electrodes. Negative electrodes consisting solely of aluminium performed even worse. However, an electrode made from a material with zero-strain associated to lithium introduction/removal such as a lithium titanate spinel exhibited good performance that was slightly dependent on the current rate used. The Li4Ti5O12/LiFePO4 cell provided capacities as high as 150 mAh g−1 under C-rate in the 100th cycle. |
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Keywords: | LiFePO4 Lithium ion batteries Electrode crumbling Li-Al alloys Li4Ti5O12 |
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