期刊
ELECTROCHIMICA ACTA
卷 55, 期 9, 页码 3075-3082出版社
PERGAMON-ELSEVIER SCIENCE LTD
DOI: 10.1016/j.electacta.2009.12.104
关键词
LiFePO4; Lithium ion batteries; Electrode crumbling; Li-Al alloys; Li4Ti5O12
资金
- CICyT [MAT2008-03160]
- Junta de Andalucia [FQM 175]
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. (C) 2010 Elsevier Ltd. All rights reserved.
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