Lithium battery positive electrode material, preparation method thereof, lithium battery, and positive electrode piece of lithium battery
A cathode material, lithium battery technology, applied in battery electrodes, secondary batteries, circuits, etc., can solve the problems of slow lithium diffusion and charge transfer, poor low temperature performance, affecting battery efficiency, etc., to achieve excellent conductive nodes and improve low temperature performance. , the effect of excellent conductive network
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[0031] Further, the present invention also provides a method for preparing the above-mentioned lithium battery positive electrode sheet, comprising the following steps:
[0032] Add lithium active material, surfactant and oxidant into water, ultrasonically disperse, then add conductive polymer glue and conductive carbon, continue ultrasonic dispersion, filter, wash, and vacuum dry the product at 100℃~160℃ for 12h~24h.
[0033] Further, the present invention also provides a positive electrode sheet for a lithium battery, which contains the positive electrode material for a lithium battery, a negative electrode sheet and an electrolyte solution according to any of the above examples.
[0034] In one example, the positive electrode sheet of the lithium battery further contains a positive electrode binder and a positive electrode conductive agent.
[0035] Still further, the present invention also provides a lithium battery, which includes the above-mentioned positive electrode sh...
Example Embodiment
[0051] Example 1
[0052] The lithium battery in this embodiment includes a positive electrode sheet, an electrolyte, a separator, a negative electrode sheet, and a tab.
[0053] Positive electrode sheet: including lithium battery positive electrode material, positive electrode binder and positive electrode conductive agent. The lithium active material in the positive electrode material of the lithium battery is a ternary nickel cobalt lithium manganate material with agglomerates and quasi-single crystals, wherein the mass fraction of the agglomerates is 60%. The median diameter (D50) of the agglomerates was 4 μm, the primary particle diameter was 550 nm; the median diameter (D50) of the quasi-single crystal was 8 μm. Lithium active material has a specific surface area of 0.5m 2 / g, the tap density is 1.5g / cm 3 . The outer surface of the ternary nickel cobalt lithium manganate material is covered with a composite conductive layer. The composite conductive polymer is comp...
Example Embodiment
[0058] Example 2
[0059] The difference between the lithium battery of this embodiment and Embodiment 1 is that the composition of the positive electrode sheet, the negative electrode sheet and the electrolyte is as follows:
[0060] Positive electrode sheet: including lithium battery positive electrode material, positive electrode binder and positive electrode conductive agent. The lithium active material in the positive electrode material of the lithium battery is a ternary nickel cobalt lithium manganate material with agglomerates and quasi-single crystals, wherein the mass fraction of the agglomerates is 30%. The median diameter (D50) of the agglomerates was 3 μm, the primary particle diameter was 300 nm; the median diameter (D50) of the quasi-single crystal was 7 μm. Lithium active material has a specific surface area of 0.7m 2 / g, the tap density is 1.65g / cm 3 . The surface of the ternary nickel cobalt lithium manganate material is covered with a composite conduct...
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