Magnetic properties of LixNiyMnyCo1−2yO2 (0.2≤1−2y≤0.5, 0≤x≤1)

LiNi1/3Mn1/3Co1/3O2 Synthesized by Sol-Gel Method: Structure and Electrochemical Properties

“…The charge/discharge behaviors are almost similar with repeating cycling. The prepared oxide had similar discharge capacity to those of the oxides prepared by other reported methods [17][18][19][20]. Good capacity retention and small capacity fading could be detected from Fig.…”

Optimization of Layered Cathode Materials for Lithium-Ion Batteries

“…Note we have implicitly assumed that the different processes do not overlap. This has been justified in [38], where we have shown from the analysis of magnetic measurements that the concentration y ′ of Ni 3+ at the concentration x max,2 does not exceed 2%, which is the uncertainty in the determination of y ′.…”

“…Gu et al have shown that, upon 300 cycles of charge/discharge, the structure of Li 1.2 Ni 0.2 Mn 0.6 O 2 is transformed into a spinel structure [65]. Therefore, the evolution of the LLLs and their related degradation upon cycling is a complex problem that is not entirely understood—in contrast with the NMC case, where the delithiation proceeds in two well-identified steps in Li x Ni y Mn y Co 1−2y O 2 : the first step of the delithiation is associated with the redox reaction involving the nickel ions: Ni 2+ → Ni 3+ → Ni 4+ in the composition range 1 > x > 1 − 2 y ; the second step is the redox process Co 3+ → Co 4+ in the range x < 1 − 2 y , as there is practically no overlap between the two redox reactions [38]. …”

Advanced Electrodes for High Power Li-ion Batteries

“…The role of Mn is to order the Li; Ni is the electrochemically active element. Co is still needed to avoid the antisite defect corresponding to Ni 2+ on the Li + site [6] facilitated by the fact that Li + and Ni 2+ ions have almost the same ionic radius; antisite defects damage the electrochemical properties where the defect concentration exceeds 2 at. % [7].…”