Mixed positive electrode material, positive plate using the same, and lithium ion battery
A technology of mixing positive electrode materials and positive electrode sheets, applied in battery electrodes, secondary batteries, circuits, etc., can solve the problem that the positive electrode material cannot meet the requirements of use, and achieve the effects of excellent cycle stability, good voltage platform, and long cycle life.
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Embodiment 1
[0045] The mixed positive electrode material of this embodiment includes the following components in parts by weight: 90 parts of nickel-cobalt-manganese ternary material, and 10 parts of lithium manganese iron phosphate.
[0046] The nickel-cobalt-manganese ternary material is a-NaFeO 2 Layered crystal structure, belonging to R3m space, chemical formula is LiNi 0.5 co 0.2 mn 0.3 o 2. The nickel-cobalt-manganese ternary material is secondary particles, the D50 of the secondary particles is 9 μm, and the specific surface area is 0.3 m 2 / g. Its scanning electron microscope picture is as figure 1 As shown, the particles are all spherical, which is conducive to uniform mixing.
[0047] The lithium manganese iron phosphate is an orthorhombic olivine crystal structure, and the chemical formula is LiMn 0.7 Fe 0.3 PO 4 . The D50 of the lithium manganese iron phosphate is 7 μm, and the specific surface area is 25 m 2 / g. Its scanning electron microscope picture is as fi...
Embodiment 2
[0059] The mixed positive electrode material of this embodiment includes the following components in parts by weight: 80 parts of nickel-cobalt-manganese ternary material, and 20 parts of lithium manganese iron phosphate.
[0060] The nickel-cobalt-manganese ternary material is a-NaFeO 2 Layered crystal structure, belonging to R3m space, chemical formula is LiNi 0.4 co 0.2 mn 0.4 o 2 . The nickel-cobalt-manganese ternary material is a secondary particle, the D50 of the secondary particle is 8.5 μm, and the specific surface area is 0.32 m 2 / g.
[0061] The lithium manganese iron phosphate is an orthorhombic olivine crystal structure, and the chemical formula is LiMn 0.65 Fe 0.35 PO 4 . The D50 of the lithium manganese iron phosphate is 8 μm, and the specific surface area is 26m 2 / g.
[0062] The positive electrode sheet using the above-mentioned mixed positive electrode material in this embodiment is prepared by the following method:
[0063] 1) Take polyvinyliden...
Embodiment 3
[0073] The mixed positive electrode material of this embodiment includes the following components in parts by weight: 70 parts of nickel-cobalt-manganese ternary material, and 30 parts of lithium manganese iron phosphate.
[0074] The nickel-cobalt-manganese ternary material is a-NaFeO 2 Layered crystal structure, belonging to R3m space, chemical formula is LiNi 0.5 co 0.2 mn 0.3 o 2 . The nickel-cobalt-manganese ternary material is secondary particles, the D50 of the secondary particles is 9 μm, and the specific surface area is 0.3 m 2 / g.
[0075] The lithium manganese iron phosphate is an orthorhombic olivine crystal structure, and the chemical formula is LiMn 0.75 Fe 0.25 PO 4 . The D50 of the lithium manganese iron phosphate is 8 μm, and the specific surface area is 26m 2 / g.
[0076] The positive electrode sheet using the above-mentioned mixed positive electrode material in this embodiment is prepared by the following method:
[0077] 1) Take polyvinylidene f...
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