|
|||||
|
|
Antagonistic effects of copper on the electrochemical performance of LiFePO4 |
|
| Authors: | Juliá n Morales,Enrique Rodrí guez-Castelló n |
| Affiliation: | a Departamento de Química Inorgánica e Ingeniería Química, Edificio Marie Curie, Campus de Rabanales, Universidad de Córdoba, 14071 Córdoba, Spain b Departamento de Química Inorgánica, Universidad de Málaga, Campus de Teatinos, 29071 Málaga, Spain c Laboratoire de Physico-Chimie de l’Etat Solide, UMR CNRS 8182, ICMMO, Université Paris XI, 91405 Orsay, France |
| Abstract: | In the last few years, several strategies towards boosting the electrochemical performance of LiFePO4 cathodes have been envisaged. Copper addition to the phosphate seems to be a simple, inexpensive method for this purpose. However, it has a serious drawback: at voltages slightly higher than that required for lithium extraction from LiFePO4, the copper is oxidized to either Cu(I) or Cu(II) with partial decomposition of the electrolyte. XRD patterns are consistent with the disappearance of copper from pristine composites upon charging at up to 4.0 V. Moreover, a copper deposit is formed on the lithium surface in the discharged state that creates a barrier hindering the release of Li ion from the electrode. Therefore, copper electroactivity strongly influences the capacity and cycling life of the cell. |
| Keywords: | Lithium ion batteries Positive electrodes Nanosized lithium iron phosphate Copper Conductive additives |
| 本文献已被 ScienceDirect 等数据库收录！ | |