|Author||Suresh, P. ♦ Shukla, A. K. ♦ Munichandran, N.|
|Source||CSIR-Central Electrochemical Research Institute|
|Subject Domain (in DDC)||Technology ♦ Engineering & allied operations ♦ Applied physics|
|Subject Keyword||Lead acid batteries ♦ Lithium batteries|
|Abstract||Layered LiMn1−xMxO2 M = Ni, Al, Mg has been synthesized over a wide range of composition by ion-exchange from their sodium precursors and characterized. Both the lattice parameters a and c of the hexagonal unit cell increase with x for Ni and Mg substitutions but decrease for Al substitution. As reflected by the broad powder X-ray diffraction peaks, scanning electron micrographs show agglomeration of submicrometer-size particles. The discharge capacity of these cathode materials varies with the nature and concentration of the substituents. LiMn0.95Ni0.05O2 exhibits a specific capacity of about 220 mAh g−1 during the initial cycling, which decays gradually to about 150 mAh g−1 after 30 charge-discharge cycles. LiMn0.95Al0.05O2 and LiMn0.95Mg0.05O2 yield capacity values of 180 and 150 mAh g−1, respectively. Cyclic voltammetry, galvanostatic intermittent titration, and ac impedance data corroborate the observed discharge capacity behavior of these cathode materials.|
|Education Level||UG and PG|
|Learning Resource Type||Article|
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