Lithium ion secondary battery and cathode material prepared by same
A technology for secondary batteries and positive electrode materials, applied in secondary batteries, battery electrodes, circuits, etc., can solve problems such as high-temperature gas production, and achieve high energy density, good high-temperature storage performance, and large-capacity effects
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[0040] Example 1:
[0041] Production of positive electrode
[0042] Use LiCoO with an average particle size D50 of 18μm 2 As a lithium cobalt oxide active material A, that is, LiCoO with a particle size of less than 18μm 2 The particle volume accounts for 50% of the total particle volume; use Li with an average particle size D50 of 12μm 1.02 Ni 0.78 Co 0.20 Al 0.02 O 2 As a high nickel active material B, that is, Li with a particle size of less than 12μm 1.02 Ni 0.78 Co 0.2 0Al 0.02 O 2 The particle volume accounts for 50% of the total particle volume. The high nickel active material B is washed with deionized water for 15 minutes before mixing to achieve the purpose of removing lithium-containing impurities (such as lithium carbonate, lithium hydroxide, etc.). After centrifugation, it is dried in vacuum at 100°C with a vacuum pressure of less than 100 Pa 20 hours to remove water. The weight ratio B / A of the high nickel active material B to the lithium cobalt oxide active materia...
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[0047] Example 2
[0048] Use LiCoO with an average particle size D50 of 18μm 2 As the lithium cobalt oxide active material A, Li with an average particle diameter D50 of 12 μm was used 1.02 Ni 0.78 Co 0.20 Al 0.02 O 2 As the high nickel active material B, the high nickel active material B was subjected to the same pretreatment method as in Example 1, but after centrifugation, it was dried in vacuum at 80° C. and a vacuum pressure of less than 100 Pa for 15 hours to remove water. The weight ratio B / A of the high nickel active material B to the lithium cobalt oxide active material A was adjusted to 1.67. And change the compaction density of the positive electrode membrane to 3.9 g / cc. Except for this, a lithium ion secondary battery was produced in the same manner as in Example 1.
Example Embodiment
[0049] Example 3
[0050] Use LiCoO with an average particle size D50 of 18μm 2 As the lithium cobalt oxide active material A, Li with an average particle diameter D50 of 12 μm was used 1.02 Ni 0.78 Co 0.20 Al 0.02 O 2 As the high nickel active material B, the high nickel active material B was subjected to the same pretreatment as in Example 1, and the weight ratio B / A of the high nickel active material B to the lithium cobalt oxide active material A was adjusted to 3. And change the compaction density of the positive electrode membrane to 3.8 g / cc. Except for this, a lithium ion secondary battery was produced in the same manner as in Example 1.
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