Large-agglomerate-size lithium manganese oxide spinel with high rate capability for lithium-ion batteries

Lithium manganese oxide spinel (LiMn2O4) with a high rate capability was sy nthesized for rechargeable lithium-ion batteries. This material consisted o f a,agglomerates (15 mum on an average) formed from smaller primary particl es (ca. 0.5-3 mum). The rate performance of the spinel was examined in an e lectrochemical test cell where the spinel was the positive electrode and me tallic Lithium was the (negative) counter electrode. The specific power out put of the cell was found to be more than 8000 W per kilogram of spinel dur ing about 100 s at a discharge rare of 20 C, or more than 400 W per kilogra m of spinel during about 1 h at a discharge rare of C/1. (C) 2000 The Elect rochemical Society. S0013-4651(00)03-081-0. All rights reserved.