Preparation and Battery Applications of Micron Sized Li 4 Ti 5 O 2

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D. PERAMUNAGE* AND K. M. ABRAHAM** *EIC Laboratories, Inc., 111 Downey Street, Norwood, MA 02062 ABSTRACT

The objective of this study was to highlight the usefulness of micron-sized Li4Ti5O 12 in three distinctive areas: a) cathode of a low-voltage Li battery, b) insertion type auxiliary electrode to investigate the electrochemistry of oxide cathode materials, and c) anode of a Li-ion cell in conjunction with LiMn 204 cubic spinel cathode. Li cells with Li4Ti5O12 exhibited an open circuit voltage of -1.6V, >90% utilization (in terms of the theoretical capacity) at -C/10 rate, -40% utilization 5C rate, and extended full-depth charge/discharge cycling at > IC rates with virtually no capacity fade. LiMn 20 4 cathodes, evaluated in Li4+.)TisO1 2 (x = -1.2)/LiMn 2O4 cells, exhibited extended full-depth cycling capability with a small capacity fade rate of .

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Capacity, mAh/g of LiMn204

CONCLUSION LiTi 5O12 electrodes prepared with PVDF or PAN binder and soaked at 140'C in the plasticizer solution achieved close to 90% of the theoretical capacity, the highest observed and over 40% of this utilization was still possible at rates higher than 5C. These electrodes underwent extended fulldepth charge/discharge cycling at *aIC rates with virtually no capacity fade. Utility of a partially lithiated Li4Ti5 O12 as an auxiliary electrode for LiMn 20 4 evaluation was also demonstrated. Balanced Li4Ti5 O 2 H/SPE//LiMn 2O 4 cell showed full-depth extended cycling capability at the C-rate for 250 cycles corresponding to an end utilization of >80 mAh/g or -0.55 mole Li per LiMn20 4. Capacity fade rate was low at

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