Electrochemical and structural performances of Li[Ni0.133Li0.2Co0.133Mn0.533]O2 material during different cycle potential windows

Abstract

The effects of cycle potential window on electrochemical behaviors, structural characteristics, and surface changes in Li[Ni 0.133 Li 0.2 Co 0.133 Mn 0.533 ]O 2 (or 0.5Li 2 MnO 3 Á0.5Li(Co 0.333 Ni 0.333 Mn 0.333 )O 2 ) in lithium-ion battery were investigated. Two flat charge potential plateaus, *3.9 and *4.5 V, are observed in the initial charge curves of the cells. Sharp changes in specific capacity and columbic efficiency are presented at *4.5 V during the first cycle. XRD specific peaks show an obvious shift with the increase in charge cutoff potential. When the charge cutoff potential is above 4.4 V, the cycle performance decreases with the increase in charge cutoff potentials. A film with the composition of C and O elements is observed on the cycled composite particle.

High Voltage Cycling Stability of LiF-Coated NMC811 Electrode

“…The root cause of these behaviors can be traced back to the detrimental effect of high-cutoff voltage cycling. The H2–H3 phase transition, which appears above ∼4.24 V, represents the unit cell contraction in the c -axis during high SOC. ,, This lattice parameter describes the distance between the Li slabs upon lithiation/delithiation. ,, A study by Ryu et al highlights the damaging effect of repeated H2–H3 transitions to the lattice structure. The anisotropic volume changes may lead to the intergranular cracking of secondary particles and create new sites for CEI layer formation. , Moreover, the formation of the NiO rock-salt phase is more susceptible to occurring in a highly delithiated Ni-rich NMC due to cation mixing and oxygen loss during cycling. ,, The presence of NiO on the surface slows down the Li + mobility due to its poor ionic conductivity, thereby increasing cell impedance. , The disappearance of the H2–H3 peak for uncoated NMC811 after 100 cycles suggests an irreversible NiO rock-salt phase transition on the surface .…”

“…20,26,45 This lattice parameter describes the distance between the Li slabs upon lithiation/delithiation. 2,12,61 A study by Ryu et al 62 highlights the damaging effect of repeated H2−H3 transitions to the lattice structure. The anisotropic volume changes may lead to the intergranular cracking of secondary particles and create new sites for CEI layer formation.…”

Research progresses in O3-type Ni/Fe/Mn based layered cathode materials for sodium ion batteries

“…With the rise of the EV and HEV markets, the demand for lithium has increased dramatically, while the uneven distribution and limited reserves of lithium resources in the earth's crust have further triggered the fluctuating prices. Compared with lithium, sodium with high abundance is widely distributed in the earth's crust and sea, and have similar intercalation chemistry [1][2][3][4][5], which demonstrates great potential for application in stationary energy storage systems [6,7].…”

From metal to cathode material: in situ formation of LiCoO2 with enhanced cycling performance and suppressed phase transition

“…Secondary batteries have been booming in recent years, not only becoming a research hotspot in academic circles, [1][2][3][4][5][6] but also being widely used in the elds of large-scale energy storage, electric vehicles (EVs), and 3C products. As the rst commercialized layered cathode material, LiCoO 2 (LCO) has been widely used in lithium-ion batteries for consumer electronics due to its advantages of high initial coulombic efficiency and high volumetric energy density.…”