Positive plate with improved infiltration capacity and lithium ion battery
A positive electrode and capability technology, applied in the field of positive electrode and lithium ion battery, can solve the problems of affecting battery cycle life and safety, restricting battery production efficiency, slow electrolyte infiltration rate, etc. Good high-rate charge-discharge characteristics and the effect of shortening the resting time
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[0032] Example 1
[0033] A positive electrode sheet with improved permeability. The positive electrode sheet with improved permeability includes a current collector. Both sides of the current collector are provided with two active material layers with the same thickness; the contact angle of the surface of the current collector is θ 0 =13°, the contact angle θ of the surface of the active material layer 1 = 13.0°, θ 2 = 10.5°.
[0034] The active material layer is composed of a positive electrode main material, a conductive agent and a surfactant, 1-COSθ 1 = 0.03, 1-COSθ 2 = 0.02.
[0035] The main material of the positive electrode is lithium iron phosphate, the conductive agent is sp, the surfactant is polyether modified siloxane, and the binder is PVDF. According to the above formula, the addition ratio of the first active material layer is 100:3 : 0.1:4, the addition ratio of the second active material layer is 100:3:0.2:4.
[0036] The method for preparing a positive electr...
Example Embodiment
[0040] Example 2
[0041] A positive electrode sheet with improved permeability, which includes a current collector. Both sides of the current collector are provided with three active material layers with the same thickness; the contact angle of the surface of the current collector is θ 0 =40°, the contact angle θ of the surface of the active material layer 1 = 20.0°, θ 2 = 16.2, °, θ 3 = 14.6.
[0042] The active material layer is composed of a positive electrode main material, a conductive agent and a surfactant, 1-COSθ 1 =0.06, 1-COSθ 2 = 0.04, 1-COS θ 3 = 0.03.
[0043] The main material of the positive electrode is NCM523, the conductive agent is sp, CNT, the surfactant is polyether modified siloxane, and the binder PVDF. According to the above formula, the addition ratio of the first active material layer is 100: 2: 1:0.2:3.5, the addition ratio of the second active material layer is 100:2.0:1.0:0.4:4, and the addition ratio of the third active material layer is 100:2.5:0...
Example Embodiment
[0048] Example 3
[0049] A positive electrode sheet with improved permeability. The positive electrode sheet with improved permeability includes a current collector. Both sides of the current collector are provided with two active material layers with the same thickness; the contact angle of the surface of the current collector is θ 0 =18°, the contact angle θ of the surface of the active material layer 1 = 18.0°, θ 2 = 14.6°.
[0050] The active material layer is composed of a positive electrode main material, a conductive agent and a surfactant, 1-COSθ 1 =0.05, 1-COSθ 2 = 0.03.
[0051] The main material of the positive electrode is NCM523, the conductive agent is sp and CNT, the surfactant is silicone modified polyacrylate, and the binder PVDF. According to the above formula, the addition ratio of the first active material layer is 100:2:1 :0.1:3.5, the addition ratio of the second active material layer is 100:2.0:2.0:0.4:3.5.
[0052] The method for preparing a positive elec...
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