Morphology and Safety of Li[Ni[sub x]Co[sub 1−2x]Mn[sub x]]O[sub 2] (0≤x≤1/2)

In recent papers, our laboratory has reported new positive-electrode materials based on the series. These materials show good reversible capacity (170 mAh/g between 3.0 and 4.4 V) and very little capacity loss over 50 cycles. Most interesting, they appear to be much less reactive with electrolyte at high temperatures than at the same potential. To investigate the reason for the large increase in thermal stability of these materials the morphology and the reactivity with electrolyte was measured for a number of samples in the series synthesized at 900°C. Materials with showed a large decrease in reactivity and, surprisingly, much smaller primary particles and tap density as compared to the sample. For samples with the morphology and reactivity remained roughly the same. The reactivity for was significantly improved compared to We conclude that viable alternatives to that appear to be safer are available in the range © 2003 The Electrochemical Society. All rights reserved.