SCHEDULED MAINTENANCE
Modification of the electrochemical activity of LiMn1.95Si0.05O4 spinel via addition of phases with different physico-chemical properties
Abstract
We report the synthesis of composites based on freeze–dried LiMn1.95Si0.05O4 spinel. In order to improve the active material–electrolyte interface for better cyclability, three different additive materials were chosen: LiMn1.9Ga0.1O4, Al2O3 and Li3PO4. A morphologic examination of the composites demonstrated a good connection of the homogeneous primary particles about 50 nm in diameter and the different additive materials, especially when adding LiMn1.9Ga0.1O4 and Al2O3. The nature of the additives was confirmed by XPS and magnetic measurements. The electrochemical study revealed that LiMn1.9Ga0.1O4 is a suitable complement to LiMn1.95Si0.05O4. Due to the similar transport properties, the concurrence of both differently substituted spinels in the electrode material has a synergistic effect favoring the electrochemical response of the cathode composite.
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