Influence of cobalt content on the electrochemical properties of sheet-like 0.5Li2MnO3·0.5LiNi1/3+xCo1/3−2xMn1/3+xO2 as lithium ion battery cathodes

β-MnO2 sacrificial template synthesis of Li1.2Ni0.13Co0.13Mn0.54O2 for lithium ion battery cathodes

“…[4][5][6][7][8][9] Li 1.2 Ni 0.13 Co 0.13 Mn 0.54 O 2 , also denoted as 0.5Li 2 -MnO 3 $0.5LiNi 1/3 Co 1/3 Mn 1/3 O 2 , stands out from other solid solution materials due to its high discharge capacity, moderate cycling performance and good rate capability. 10,11 Its improved electrochemical performances can be attributed to a reasonable ratio of Li 2 MnO 3 to LiNi 1/3 Co 1/3 Mn 1/3 O 2 components and the appropriate existence of the element Co. [12][13][14][15][16] Therefore, conventional methods such as sol-gel, 17,18 sucrose combustion, 19 molten salt, 20,21 co-precipitation 19,22,23 and polymer gel 24 have been successfully introduced for the preparation of this most promising solid solution. These show that the structural and electrochemical properties of the as-prepared materials are determined by the synthesis methods and/or preparation conditions.…”

Considering Critical Factors of Li‐rich Cathode and Si Anode Materials for Practical Li‐ion Cell Applications

“…In this phase, x/y/z can be in ratios of 1:1:1, 5:2:3, and 1:0:1, which are widely known to be stable compositions for Ni‐based materials. [10a], Note that the structural stability of Li‐rich materials strongly depends on the composition of the layered phase. Therefore, when Ni 0.25 Mn 0.75 (OH) 2 is used as the precursor, 0.5Li 2 MnO 3 – 0.5LiNi 0.5 Mn 0.5 O 2 with maximum stability can be formed by inserting 1.5 mol of Li per mole of transition metal ion.…”

“…Therefore, when Ni 0.25 Mn 0.75 (OH) 2 is used as the precursor, 0.5Li 2 MnO 3 – 0.5LiNi 0.5 Mn 0.5 O 2 with maximum stability can be formed by inserting 1.5 mol of Li per mole of transition metal ion. This is because LiNi 0.5 Mn 0.5 O 2 , which is the composition of the layered phase, is more stable than other compositions such as LiNi 0.4 Mn 0.6 O 2 and LiNi 0.8 Mn 0.2 O 2 . In short, the chemical composition of the layered phase strongly affects the structural stability of the Li‐rich materials, rather than the chemical composition ratio of the Li 2 MnO 3 and LiMO 2 phases.…”

Cr-Doped Li-Rich Nickel Cobalt Manganese Oxide as a Positive Electrode Material in Li-Ion Batteries to Enhance Cycling Stability

“…We investigated the influence of Cr doping/substitution on both the specific discharge and the potential drop upon cycling using electrochemical, morphological, and structural characterization techniques. As the ratio between the different transition metals has an influence on the electrochemical properties, − we kept it constant. The influence of the Cr-ions was investigated by (i) a substitution (1 Cr 3+ replacing 3 Li + ) of Li/Cr and (ii) a simple Cr-addition (what we will refer to as doping).…”