LiMn0.8Fe0.2PO4/Li4Ti 5O12, a possible Li-ion battery system for load-leveling application

Valentina Borgel, Gregory Gershinsky, Terry Hu, Murali G. Theivanayagam, Doron Aurbach

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We examined a new Li-ion battery system based on the combination of a high voltage LiMn0.8Fe0.2PO4 (LMFP) cathode with a Li4Ti5O12 (LTO) anode. Due to the relatively high red-ox voltage of LTO (1.5 V vs. Li) and the excellent stability of its spinel structure, as well as the fact that the red-ox potential of a Li[MnFe]PO4 cathode, up to 4.1 V, does not endanger the anodic stability of a standard electrolyte solutions, it is assumed that such cells can be safe, stable, highly reversible, and suitable for load-leveling applications. The LMFP/LTO cells exhibited excellent rate capability and cycle life at 30°C, delivering discharge capacity of 153, 152, 146, and 118 mAhg-1 (cathode) at 0.1 C, C, 2 C, and 5 C rates. These cells demonstrated excellent high temperature performance when the LTO anodes were pre-passivated before cell operation. By XRD and ICP analyzes of C-LiMn 0.8Fe0.2PO4 electrodes before and after charge/discharge cycles, the capacity fading of these systems at high temperatures was attributed to depletion of active Li from the electrodes, due to side reactions on the anode side. These were avoided by pre-passivation of the LTO electrodes. The surface chemistry of Li4Ti5O 12 anodes was investigated with the anodic surface reactions arising mainly from the salt (LiPF6).

Original languageEnglish
Pages (from-to)A650-A657
JournalJournal of the Electrochemical Society
Issue number4
StatePublished - 2013


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