Layered Li[Ni[sub x]Co[sub 1−2x]Mn[sub x]]O[sub 2] Cathode Materials for Lithium-Ion Batteries

Effect of CO2 on Layered Li1+zNi1-x-yCoxMyO2 (M=Al,Mn) Cathode Materials

“…The oxidation state of Ni is 3+ in NCA composition. On the other hand, it has been previously suggested that the oxidation states of Ni is 2+ in NCM (Ni/Mn molar ratio = 1) composition (4)(5)(6)(7)(8). It is supposed that unstable Ni 3+ is responsible for CO 2 absorption.…”

“…On the other hand, for NCM cathode materials, we consider the most of the excess lithium is incorporated into the crystal, because the lattice parameter linearly changes as the excess lithium content changes. , 11 (29) 7-13 (2008 It has been previously suggested the oxidation states of Ni, Co and Mn are +2, +3 and +4, respectively, in the NCM (Ni/Mn molar ratio = 1) series (4)(5)(6)(7)(8). In our previous work, in order to obtain information for the oxidation states of transition metal in NCM (Ni/Mn molar ratio = 1), Ni, Mn and Co K-edge XANES spectra were measured (10,11).…”

Controllable Hydrothermal Conversion from Ni-Co-Mn Carbonate Nanoparticles to Microspheres

“…However, cobalt also causes serious problems, such as high price and environmental concerns. Alternatively, a promising material is Li[Ni x Co y Mn 1−x−y ]O 2 with a layered structure, which is considered to be one of the best replacements for LiCoO 2 for hybrid electric vehicle (HEV) power source systems [2][3][4][5][6][7][8]. Since this material has combined nickel, cobalt, and manganese together, it may show the advantages of these three metals in terms of thermal stability, rate capability, and safety at a proper composition.…”

“…Many studies have shown that the electrochemical performance of the final product strongly depends on the properties of the precursor, such as morphology [10][11][12][13], size of the primary and secondary particles [13][14][15][16], size distribution [17], composition [6,8,9,[18][19][20][21], as well as structure [22,23]. Therefore, it is vital to control the precursor in order to obtain the materials with excellent performance, for which a simple and controlled preparation method is highly required.…”

First principles study of Li diffusion inI-Li2NiO2structure

“…Particular attention has been given to the Ni +2 / Ni +4 double redox couple, which has been shown to exchange two electrons in layered LiNi 0.5 Mn 0.5 O 2 , [1][2][3][4][5][6] LiNi 1/3 Co 1/3 Mn 1/3 O 2 , 7,8 Li͑Ni x Li 1/3−2x/3 Mn 2/3−x/3 ͒O 2 , 9 LiNi 2/3 Sb 1/3 O 2 , 10 and spinel LiNi 0.5 Mn 1.5 O 4 . 11 Multielectron redox reaction can provide a way to overcome the capacity limitation caused by the usual limit of one electron per transition metal in an acceptable voltage range that applies to cations in most of cathode materials.…”