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Electrochemical characteristics of MnO2V2O5 composites serving as positive material for secondary lithium batteries

✍ Scribed by N. Kumagai; S. Tanifuji; K. Tanno

Publisher
Elsevier Science
Year
1991
Tongue
English
Weight
355 KB
Volume
35
Category
Article
ISSN
0378-7753

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✦ Synopsis

Mn0 2 -V 2 05 composites formed by heating mixtures of Mn0 2 and NH,VO 3 under various conditions are evaluated as positive material for secondary lithium batteries . The charge/ discharge characteristics of the composites are dependent on the type of Mn0 2 used, the heat-treatment temperature, the discharge rate, and the depth-of-discharge . A composite formed by heating a mixture of EMD and NH"VO3 (V/Mn atom ratio= 1 .0) at 350 °C for 4 h in air exhibits the best cycling characteristics, and gives a discharge capacity of 250-350 A h/kg-oxide over 10 cycles at a current density of 0 .20 mA cm -2 at 25

°C in 1 M LiC10,propylene carbonate . X-ray diffraction, X-ray photoelectron spectroscopic, and SEM studies of the composite reveal that the charge/discharge characteristics may be determined by the structure of a surface layer formed on the MnO, particles .

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