Isothermal calorimetry investigation of Li{sub 1+x}Mn{sub 2-y}Al{sub z}O{sub 4} spinel.

Journal Article · Fri May 25 04:00:00 EDT 2007 · Electrochimica Acta

DOI:https://doi.org/10.1016/j.electacta.2007.03.005· OSTI ID:940945

Lu, W; Belharouak, I; Park, S H; Sun, Y K; Amine, K

The heat generation of LiMn{sub 2}O{sub 4}, Li{sub 1.156}Mn{sub 1.844}O{sub 4}, and Li{sub 1.06}Mn{sub 1.89}Al{sub 0.05}O{sub 4} spinel cathode materials in a half-cell system was investigated by isothermal micro-calorimetry (IMC). The heat variations of the Li/LiMn{sub 2}O{sub 4} cell during charging were attributed to the LiMn{sub 2}O{sub 4} phase transition and order/disorder changes. This heat variation was largely suppressed when the stoichiometric spinel was doped with excess lithium or lithium and aluminum. The calculated entropy change (dE/dT) from the IMC confirmed that the order/disorder change of LiMn{sub 2}O{sub 4}, which occurs in the middle of the charge, was largely suppressed with lithium or lithium and aluminum doping. The dE/dT values obtained did not agree between the charge and the discharge at room temperature (25 C), which was attributed to cell self-discharge. This discrepancy was not observed at low temperature (10 C). Differential scanning calorimeter (DSC) results showed that the fully charged spinel with lithium doping has better thermal stability.

• Research Organization: Argonne National Laboratory (ANL)
• Sponsoring Organization: EE
• DOE Contract Number: AC02-06CH11357
• OSTI ID: 940945
• Report Number(s): ANL/CMT/JA-57702
• Journal Information: Electrochimica Acta, Journal Name: Electrochimica Acta Journal Issue: 19 ; May 25, 2007 Vol. 52; ISSN 0013-4686; ISSN ELCAAV
• Country of Publication: United States
• Language: ENGLISH

Related Subjects

25 ENERGY STORAGE
ALUMINIUM OXIDES
BATTERY CHARGING
CALORIMETRY
CATHODES
DOPED MATERIALS
ENTROPY
LITHIUM OXIDES
MANGANESE OXIDES
METAL-NONMETAL BATTERIES
REACTION HEAT
SPINELS
STABILITY