Performance of layered Li(Ni1/3Co1/3Mn1/3)O2 as cathode for Li-ion batteries

Methods for promoting electrochemical properties of LiNil/3Col/3Mnl/3O2 for lithium-ion batteries

“…Typical chargedischarge profile of NCM is shown in Figure 2. This result is similar to the reports [8,17]. Now the high-performance cathode material still has a lot of problems to be resolved, such as cation mixing, capacity decaying too fast at a large current and the transition metal ions dissolving into electrolyte.…”

“…Li + in 3b and M in 3a sites) would give rise to disordering in the structure called 'cation mixing', which is known to deteriorate the electrochemical performance of the above layered compounds [17]. More Ni 2+ in lithium layer results in harder de-intercalation of Li + , and the electrochemical properties gets worse [18].…”

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).…”

Electrochemical Properties of 0.3Li2MnO3·0.7LiMn0.55Ni0.30Co0.15O2Electrode Containing VGCF for Lithium Ion Battery

“…to replace LiCoO 2 . 1-5) Among those materials, LiNi x Mn y Co (1-x-y) O 2 , generally referred to as NCM, has been reported to enhance thermal stability and electrochemical properties by substituting transition metals (Mn, Ni or Al) in LiCoO 2 for Co. 3) Especially, the solid solution created by Li 2 MnO 3 and LiMO 2 (M = Mn, Ni and Co), a complex layered compound, is considered to be promising cathode material because of its high reversible capacity of about 230-250 mAh/g when it is charged up to 4.8 V vs Li + /Li, and its structural stability attributed to electrochemically inactive Mn 4+ ions during charge and discharge. [6][7][8][9][10] On the other hand, as the content of Mn ions increase, discharge capacity considerably decreases at a high current rate because of the high internal resistance in the electrode caused by the Jahn-Teller distortion, due to the Mn 3+ ions.…”