Article ID Journal Published Year Pages File Type
11028295 Electrochimica Acta 2018 9 Pages PDF
Abstract
A high-capacity iron- and nickel-substituted Li2MnO3 cathode [i.e., Li1.26Fe0.11Ni0.11Mn0.52O2 (LFNM)] treated by carbothermal reduction was analyzed, and the results clarified that it has both high capacity and high safety levels. X-ray analysis of a reduced LFNM (R-LFNM) cathode clarified the following. Migration of transition metals in the lattice as a result of the carbothermal reduction stabilizes the layered lattice structure, which prevents lattice shrinkage during charging and enhances charge compensation. As a result, more lithium ions can return to the cathode during discharging; namely, the irreversible capacity of the cathode decreases. Thermal stability of the R-LFNM cathode was evaluated by differential scanning calorimetry (DSC), and the results show that the total heat evolved from the R-LFNM cathode remains at a lower level compared with that of other cobalt- and nickel-containing Li2MnO3 cathodes. An analysis of the lattice structure reveals that low exothermic heat from the charged R-LFNM cathode results from the distinctive property of its crystal lattice changing from layered to thermally stable spinel during charging.
Related Topics
Physical Sciences and Engineering Chemical Engineering Chemical Engineering (General)
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