Cathode Active Material for Lithium-Ion Battery LIB

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%). 

Mossbauer spectra (Fig. 27.1) of LIB (coin cell type) in which FeP04 was used as a cathode active material showed a quantitative reduction of iron from Fe to Fe after full discharge, while a reverse oxidation from Fe to Fe was 

Mossbauer spectra of cathode material for LIB containing FeP04 as a cathode active material  

27 MOSSBAUER STUDY OF NEW ELECTRICALLY CONDUCTIVE OXIDE GLASS 

Behavior of Na ions during discharge and charge of sodium-ion battery (SIB) was also investigated by means of Mossbauer spectroscopy intercalation (sorption) and deintercalation (desorption) of Na ions could be respectively confirmed as reduction and oxidation of iron in Fe P04 [II]. 

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