Journal
ELECTROCHIMICA ACTA
Volume 51, Issue 26, Pages 5912-5919Publisher
PERGAMON-ELSEVIER SCIENCE LTD
DOI: 10.1016/j.electacta.2006.03.029
Keywords
spinel; manganese; NiO; additive; cathode; lithium; battery
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We report on electrochemical properties of NiO-blended spinel Li1.1Mn1.9O4 at elevated temperature (60 degrees C). Thus, we employed two kinds of NiO powders, those are, larger particle size (> 10 mu m) and submicron-sized NiO powders obtained by a ball-milling. These NiO powders were blended to the spine] Li1.1Mn1.9O4 as an additive for fabrication of cathode. The resulting discharge capacity for the larger NiO particle-blended Li1.1Mn1.9O4 had similar electrochemical properties to the bare Li1.1Mn1.9O4. On the other hand, submicron-sized NiO-blended Li1.1Mn1.9O4 brought about slightly increased capacity and excellent capacity retention, maintaining its initial capacity of 99.2% at 25 degrees C and 94% at 60 degrees C when Li metal was employed as the anode. In Li-ion cell using graphite as the anode, the capacity retention was of about 80% during cycling at 60 degrees C, whereas C/Li1.1Mn1.9O4 cell retained around 68% of its initial capacity. Such improved properties would be ascribed to the HF scavenging into the electrolyte by presence of the submicron-sized NiO particles in Li1.1Mn1.9O4 cathode. (c) 2006 Elsevier Ltd. All rights reserved.
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