Morphology and electrochemical performance of Li[Li0.2Mn0.56Ni0.16Co0.08]O2 cathode materials prepared with different metal sources

Coprecipitation-Gel Synthesis and Degradation Mechanism of Octahedral Li1.2Mn0.54Ni0.13Co0.13O2 as High-Performance Cathode Materials for Lithium-Ion Batteries

The octahedral core-shell Li-rich layered cathode material of Li_1.2Mn_0.54Ni_0.13Co_0.13O₂ can be synthesized via an ingenious coprecipitation-gel method without subsequent annealing. On the basis of detailed X-ray diffraction, scanning electron microscopy, transmission electron microscopy, and electron energy loss spectroscopy characterizations, it is suggested that the as-prepared material consists of an octahedral morphology and a new type of core-shell structure with a spinel-layered heterostructure inside, which is the result of overgrowth of the spinel structure with {111} facets on {001} facets of the layered structure in a single orientation. The surface area of Li_1.2Mn_0.54Ni_0.13Co_0.13O₂ crystals where the spinel phase is located possesses sufficient Li and O vacancies, resulting in the reinsertion of Li into position after the first charge and maintenance of the interface stability via the replenishment of oxygen from the bulk region. Compared to that synthesized by the traditional coprecipitation method, the Li_1.2Mn_0.54Ni_0.13Co_0.13O₂ synthesized by the coprecipitation-gel method exhibits higher discharge capacity and Coulombic efficiency, from 73.9% and 251.5 mAh g^-1 for the spherical polycrystal material to 86.2% and 291.4 mAh g^-1.

Effect of valence states of Ni and Mn on the structural and electrochemical properties of Li1.2NixMn0.8−xO2 cathode materials for lithium-ion batteries

Severe capacity fading and voltage decay of Li-rich layered oxides for lithium-ion batteries remain the major bottlenecks to commercialization.

Toward a stabilized lattice framework and surface structure of layered lithium-rich cathode materials with Ti modification

Ti modification improves the cycling performance of lithium-rich materials by stabilizing the framework structure and the electrode/electrolyte interface.