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Thermodynamic Stability of Transition‐Metal‐Substituted LiMn 2− x M x O 4 (M=Cr, Fe, Co, and Ni) Spinels

Journal Article · · ChemPhysChem
 [1];  [1];  [2];  [2];  [1]
  1. Peter A. Rock Thermochemistry Laboratory and NEAT ORU University of California Davis One Shields Ave. Davis CA 95616 USA
  2. McKetta Department of Chemical Engineering University of Texas at Austin 200 E. Dean Keeton St. Stop C0400 Austin TX 78712 USA
Abstract

The formation enthalpies from binary oxides of LiMn 2 O 4 , LiMn 2− x Cr x O 4 ( x= 0.25, 0.5, 0.75 and 1), LiMn 2− x Fe x O 4 ( x= 0.25 and 0.5), LiMn 2− x Co x O 4 ( x= 0.25, 0.5, and 0.75) and LiMn 1.75 Ni 0.25 O 4 at 25 °C were measured by high temperature oxide melt solution calorimetry and were found to be strongly exothermic. Increasing the Cr, Co, and Ni content leads to more thermodynamically stable spinels, but increasing the Fe content does not significantly affect the stability. The formation enthalpies from oxides of the fully substituted spinels, LiMnMO 4 (M=Cr, Fe and Co), become more exothermic (implying increasing stability) with decreasing ionic radius of the metal and lattice parameters of the spinel. The trend in enthalpy versus metal content is roughly linear, suggesting a close‐to‐zero heat of mixing in LiMn 2 O 4 —LiMnMO 4 solid solutions. These data confirm that transition‐metal doping is beneficial for stabilizing these potential cathode materials for lithium‐ion batteries.

Sponsoring Organization:
USDOE
Grant/Contract Number:
FG02-03ER46053
OSTI ID:
1400455
Journal Information:
ChemPhysChem, Journal Name: ChemPhysChem Journal Issue: 13 Vol. 17; ISSN 1439-4235
Publisher:
Wiley Blackwell (John Wiley & Sons)Copyright Statement
Country of Publication:
Germany
Language:
English

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