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Defect Spinels in the System Li—Mn—O. Chemistry and Lithium Insertion

  • F. Le Cras (a1) (a2), D. Bloch (a2), M. Anne (a1) and P. Strobel (a1)

Abstract

Spinel phases Li-Mn-C with Li/Mn ratios between 0.35 and 0.8 were synthesized. The relationships between composition, manganese valence, vacancy fraction and electrochemical capacity are described using a new composition-valence phase diagram. Electrochemical performances in lithium batteries are compared. The best materials showed constant capacit> 140 Ah/kg in the range 3.5/2 V in liquid electrolyte batteries up to 20 cycles, without the usual capacity drop observed in stoichiometric LiMn204.

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Defect Spinels in the System Li—Mn—O. Chemistry and Lithium Insertion

  • F. Le Cras (a1) (a2), D. Bloch (a2), M. Anne (a1) and P. Strobel (a1)

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