High-voltage lithium ion battery anode, lithium ion battery using same and preparation method of high-voltage lithium ion battery anode

[0047] The preparation method of the positive electrode is

[0048] First disperse the binder uniformly in the solvent,

[0049] Then add the positive electrode active material material and the conductive agent to the mixture, add it to a container filled with nitrogen or argon inert atmosphere, ball mill, after the grinding is fully and uniformly mixed, add to the solvent, mix evenly to obtain a slurry, The obtained slurry is coated on the aluminum foil of the current collector, dried, rolled, and cut to obtain the above-mentioned positive electrode.

[0050] The solvent is N-methylpyrrolidone.

[0051] The lithium ion battery provided in this embodiment includes a positive electrode, a negative electrode, a separator inserted between the positive electrode and the negative electrode, an electrolyte, and a battery casing. The separator is polyethylene, polypropylene or polyethylene and polypropylene composite film, which is inserted between the positive electrode and the negative elect

[0059] Preferred Embodiment 1

[0060] This embodiment is used to prepare the high-voltage lithium ion battery anode of this embodiment

[0061] According to the mass percentage, 91% of the positive electrode active material LiNi 0.5 Mn 1.5 O 4 / C, 2.5% super conductive carbon black, 2.5% super conductive graphite, 4% binder polyvinylidene fluoride, using N-methylpyrrolidone as the solvent, first disperse the binder uniformly in the solvent; The conductive agent and the positive electrode active material are mixed and stirred uniformly, then dispersed in the solvent, and stirred to make them uniformly mixed to form a slurry. Using 19μm thick aluminum foil as the current collector, the slurry was uniformly coated on the aluminum foil, and the temperature was controlled at 125°C and dried for 8 hours. The coating surface density of the positive electrode was 31mg / cm. 2 .

[0062] The pole piece was rolled, dried at 115°C for 12 hours under an inert argon atmosphere, and then cut to m

[0063] Preferred Embodiment 2

[0064] This embodiment is used to prepare the high-voltage lithium ion battery anode of this embodiment

[0065] According to the mass percentage, 86% of the positive electrode active material LiNi 0.5 Mn 1.5 O 4 / C material, 3.75% superconducting carbon black, 3.75% conductive graphite, 6.5% binder polyvinylidene fluoride, using N-methylpyrrolidone as the solvent, first disperse the binder uniformly in the solvent; The conductive agent and the positive electrode active material are mixed and stirred uniformly, then dispersed in the solvent, and stirred to make them uniformly mixed to form a slurry. A 25μm thick aluminum foil was used as the current collector, and the slurry was coated on the aluminum foil, and the temperature was controlled to 125°C and dried for 8 hours. The coating surface density of the positive electrode is 26mg / cm 2 .

[0066] The pole piece was rolled, dried at 110°C for 12 hours under an inert nitrogen atmosphere, and then c