Journal
SOLID STATE IONICS
Volume 139, Issue 1-2, Pages 37-46Publisher
ELSEVIER SCIENCE BV
DOI: 10.1016/S0167-2738(00)00813-4
Keywords
monoclinic lithium iron(II) and lithium cobalt(II) orthoborates; hexagonal lithium manganese(II) orthoborate; lithium deinsertion/insertion behavior
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The LiMBO3 (M = Mn, Fe, Co) compounds were synthesized by a solid state reaction. LiFeBO3 and h-LiMnBO3 crystal structures were determined from single crystal data. LiFeBO, exhibits the same structure as that of other already described LiMBO3 compounds (M = Mg, Mn, Co, Zn). The structure of h-LiMnBO3 is isotypic with the hexagonal form of LiCdBO3. The elecrrochemical study shows that a very small amount of lithium (less than 0.04 Li per formula unit) can be deinserted reversibly from the three compounds. According to the thermodynamic study performed in the case of LiFeBO3, the Fe3+/Fe2+ redox couple lies between 3.1 and 2.9 V/Li, demonstrating an important inductive effect of the BO3 group. (C) 2001 Elsevier Science B.V. All rights reserved.
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