Features of electrochemical transformation of LiMn2O4 composition with Norit carbon filler in a model lithium accumulator

Conductive fillers play an essential role in the efficiency of the electrochemical performance of semiconducting LiMn 2 O 4 spinel in a lithium accumulator. In this study, in order to improve the discharge characteristics of LiMn 2 O 4 spinel in a thin-layer electrode, a Norit carbon filler with a s...

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Bibliographic Details
Published in:Surface engineering and applied electrochemistry 2015-05, Vol.51 (3), p.296-303
Main Authors: Apostolova, R. D., Peskov, R. P., Shembel, E. M.
Format: Article
Language:English
Subjects:
Engineering
Machines
Manufacturing
Processes
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Summary:Conductive fillers play an essential role in the efficiency of the electrochemical performance of semiconducting LiMn 2 O 4 spinel in a lithium accumulator. In this study, in order to improve the discharge characteristics of LiMn 2 O 4 spinel in a thin-layer electrode, a Norit carbon filler with a submicron particle size was used as a filler. The composition of spinel with this filler ensures a discharge capacity of more than 100 mA h/g at a high discharge rate (more than 10 C) in the redox reaction with lithium in EC, DMC, 1 M LiClO 4 electrolytes. Decrease of capacity takes place after the 200th cycle. The causes of this decrease upon cycling and at lower temperatures were analyzed via the impedance spectroscopy method. The efficient resistance of the charge transfer through the spinel composite electrode/electrolyte interface and the diffusion of Li + play key roles in the degradation processes in the intercalation/deintercalation of Li ions into/from the spinel composite.
ISSN:1068-3755
1934-8002
DOI:10.3103/S1068375515030035