Electrochemical deintercalation of lithium ions from lithium iron chloride spinel

A lithium iron chloride inverse spinel was prepared to examine the electrochemical Li+ deintercalation from the chloride spinel in an all-solid state cell. While the chloride spinel has a high ionicity, it was confirmed that Li ions could be extracted from the structure without dissolving with a potential of 3.6 V vs. Li/Li+. Powder X-ray diffraction of the material showed coexistence of two kinds of spinels with different lattice constants. Mِssbauer spectra revealed that the deintercalation of Li+ was accompanied with the oxidation of iron from Fe2+ to Fe3+. The amount of deintercalated lithium estimated from the electrical capacity showed large value of 1.2 per formula unit, which indicates both Li+ in 8a and 16d sites were deintercalated.