Cathode Active Material for Li-Ion Battery LIB

Mossbauer spectroscopy can be a very effective tool for the development of energy-related materials such as electrode, solid-state electrolyte, sensor, and so on. Mossbauer study of cathode active material for LIB is very interesting, since the 

Activation energy (Eg) for the electrical conduction obtained for 20Ba0 10Fe203 70V20s glass after isothermal annealing at 350-500 °C. 

27 MOSSBAUER STUDY OF NEW ELECTRICALLY CONDUCTIVE OXIDE GLASS 

Mossbauer spectra of LiFeVPO glass before (top, a) and after (top, b) isothermal annealing at 450 C for 120min. Mossbauer spectra of LiFeVo.sPOx glass before (middle, a) and after (middle, b) isothermal annealing at 450°C for 120 min. Mossbauer spectra of LiFePO ( glass before (bottom, a) and after isothermal annealing at 550 C for 120 min (bottom, b) [14], 

These results indicate that structural relaxation of Vanadate glass units, as confirmed from Mossbauer study (Fig. 27.10, top), gives rise to an increase in crof LiFeVPO , glass from the order of I0 to 10 Scm when annealed at 450 °C for 60 min (Fig. 27.11, ). This is also the case for LiFeVo.sPO glass (Fig. 27.1 I, A) that showed a similar decreaseof A (Fig. 27.10, middle) with an increase of a from I0 to 10 Scm after isothermal annealing at 450 °C for 60 min. 

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LiCo02 and LiNi02 have been used as a cathode active material for Li-ion battery (LIB) of mobile phone, personal computer, and so on. LiFeP04 of olivine type has attracted much interest as a new cathode active material for LIB. LiFeP04 of olivine type has an outstanding characteristic feature that it is rare-earth free, less toxic, and highly abundant on the Earth [8,9] the abundance of iron on the Earth amounts to 50,000 ppm (5%). 

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