Preparation and electrochemical characterization of micron-sized spinel LiMn{sub 2}O{sub 4}
- EIC Labs., Inc., Norwood, MA (United States)
The preparation and characterization of spinel LiMn{sub 2}O{sub 4} having small average particle sizes (<4.0 {micro}m) and narrow particle size distribution are reported. They were obtained by heating a 1:4 Li{sub 2}CO{sub 3}/MnCO{sub 3} mixture at 650 to 850 C in oxygen. Particle size control of the product was achieved by controlling the particle sizes of the precursor materials and the heating conditions. Heating the Li{sub 2}CO{sub 3}/4MnCO{sub 3} mixture results in the formation of Mn{sub 2}O{sub 3} initially, which then reacts with Li{sub 2}CO{sub 3} to form spinel LiMn{sub 2}O{sub 4} according to: 2Li{sub 2}CO{sub 3} + 4 Mn{sub 2}O{sub 3} + O{sub 2} {yields} 2CO{sub 2}. The LiMn{sub 2}O{sub 4} cathodes have shown excellent rechargeability as well as superior rate capability in Li/polymer electrolyte/LiMn{sub 2}O{sub 4} cells cycled between 3.0 and 4.3 V. Specific capacities between 0.75 and 0.83 /Li per LiMn{sub 2}O{sub 4} were obtained for more than fifty cycles. The LiMn{sub 2}O{sub 4} cathodes can be reversibly cycled between 2.4 and 3.5 V but with declining capacity. For the LiMn{sub 2}O{sub 4} prepared at 650 C, cycling in the 3 V region has little effect on its subsequent performance in the 4 V region, while for the LiMn{sub 2}O{sub 4} prepared at higher temperatures, such cycling causes the 4 V capacity to decline.
- Sponsoring Organization:
- USDOE
- OSTI ID:
- 256813
- Journal Information:
- Journal of the Electrochemical Society, Vol. 143, Issue 5; Other Information: PBD: May 1996
- Country of Publication:
- United States
- Language:
- English
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