Ternary lithium battery advantages

Ternary lithium battery has high energy density and better cycle performance than normal lithium drill acid. At present, with the continuous improvement of the formula and the improvement of the structure, the nominal voltage of the battery has reached 3.7V, and the capacity has reached or exceeded the level of lithium drill acid batteries.

LiNi1/3Co1/3Mn1/3O2 cathode material has a single A-NAFEO2 layered rock salt structure based on hexagonal crystal system similar to LiCoO2, and the spatial point group is R3m. Lithium ions occupy the 3a position of the rock salt structure (111), transition metal ions occupy the 3b position, and oxygen ions occupy the 6c position. Each transition metal atom is surrounded by 6 oxygen atoms to form the MO6 octahedral structure, and lithium ions are embedded in the Ni1/3Co1/3Mn1/3O layer formed by transition metal atoms and oxygen. Because the radius of the divalent nickel ion (0.069nm) is close to the radius of the lithium ion (0.076nm), a small number of nickel ions may occupy the 3a position, resulting in a cationic mixing occupation, and this mixing occupation makes the electrochemical performance of the material worse. Usually in XRD, the intensity ratio of (003)/(104) peaks and the degree of splitting of (006)/(012) and (018)/(110) peaks are used as indicators of the cationic mix occupancy. In general, when the intensity ratio of (003)/(104) peaks is higher than 1.2, and the (006)/(012) and (018)/(110) peaks are significantly split, the layered structure is obvious and the electrochemical properties of the material are excellent. The cell parameters of LiNi1/3Co1/3Mn1/3O2 are a=2.8622A and c=14.2278A. In the lattice, nickel, diamond and manganese exist at +2, +3 and +4 valence respectively, while there is also a small amount of Ni3+ and Mn3+. In the process of charging and discharging, in addition to the electron transfer of Co3+/4+, there is also the electron transfer of Ni2+/3+ and Ni3+, which also makes the material have a higher specific capacity. Mn4+ only acts as a structural substance and does not participate in REDOX reactions. Koyama et al. proposed two models describing the crystal structure of LiNi1sCou3Mnm3O2, that is, complex models with [v3xV3] R30° type superstructure [Ninaco1sMn1] layer, with cell parameter a=4.904

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