Lithium ion battery anode film, preparation and application thereof
A lithium-ion battery, cathode film technology, applied in battery electrodes, lithium storage batteries, non-aqueous electrolyte storage battery electrodes, etc., can solve the problems of reduced cycle efficiency and capacity attenuation of lithium-ion batteries
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[0075] The method for preparing the positive electrode film of the lithium battery of the present invention can mix the lithium ion supplement into the positive electrode material or slurry of the lithium battery and / or apply it on the positive electrode of the battery after the positive electrode of the conventional lithium battery is prepared. Specifically, the commonly used preparation methods include the following three:
[0076] (a1) provide a positive electrode material slurry, the slurry contains lithium intercalation transition metal oxide positive electrode material, lithium ion supplement, and conductive agent and binding agent; A positive electrode film is made by drying; or
[0077] or
[0078] (a3) Coating the lithium ion supplement on the surface of the dried lithium ion battery positive electrode, thereby forming a lithium battery positive electrode film containing the lithium ion supplement.
[0079] battery positive
[0080] The positive electrode of the ba...
Embodiment 1
[0090] Example 1 Preparation of Battery Positive Electrode 1
[0091] Lithium iron phosphate, a commercial lithium-ion battery anode material, is uniformly mixed with lithium ion supplement lithium peroxide, conductive agent acetylene black, and binder polyvinylidene fluoride (PVDF) in a nitrogen-methylpyrrolidone (NMP) solution.
[0092] The mass of lithium peroxide added is 1% of the mass of the positive electrode material lithium iron phosphate, the mass ratio of the positive electrode material, acetylene black and binder is 85:10:5 respectively, and then coated and pressed on the aluminum foil to obtain the positive electrode of the battery 1.
Embodiment 2
[0093] Example 2 Preparation of lithium battery 2 (half battery)
[0094] The positive electrode 1 of the battery is assembled into a CR2032 button lithium battery 2 with a metal lithium sheet as the positive electrode, a solution of ethylene carbonate and dimethyl carbonate of 1mol / L lithium hexafluorophosphate as the electrolyte, and polyethylene with a thickness of 20 microns as the diaphragm.
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