Surface/Chemically Modified LiMn[sub 2]O[sub 4] Cathodes for Lithium-Ion Batteries

Publisher Website
Google Scholar
Abstract
Spinel oxide has been surface/chemically modified with and MgO using a chemical processing procedure followed by heat-treatment at 300-800°C. The surface/chemically modified samples show much better capacity retention at both 25 and 60°C than does the unmodified (41% fade in 100 cycles at 60°C). Among the various compositions investigated, the -modified sample shows superior capacity retention with only 2.8% fade in 100 cycles at 60°C with around 110 mAh/g. The -modified sample shows a higher capacity of 130 mAh/g, but with a faster fade (16% in 100 cycles at 60°C). The -modified sample shows the best combination of capacity (124 mAh/g) and retention (8% fade in 100 cycles at 60°C). The modified samples also exhibit better capacity retention after aging at 55°C at 60-70% depth of discharge. © 2002 The Electrochemical Society. All rights reserved.