Effects of different electrode materials on the performance of lithium tetrafluorooxalatophosphate (LiFOP) electrolyte

The cycling performance of LiPF(4)(C(2)O(4)) electrolyte is compared with LiPF(6) electrolyte in the presence of several different electrode materials. The cycling of MCMB/LiNi(1/3)Co(1/3)Mn(1/3)O(2) and natural graphite/LiFePO(4) cells provides very similar performance for both electrolytes. However. MCMB/LiMn(2)O(4) cells have a lower initial reversible capacity with LiPF(4)(C(2)O(4)) electrolytes. A detailed analysis of the surface films on both the cathode and the anode via X-ray photoelectron spectroscopy (XPS) and scanning electron microscopy (SEM) was conducted. The performance differences are attributed to the anode as opposed to the cathode. (C) 2011 Elsevier B.V. All rights reserved.