Lithium ion battery positive material, and positive electrode and battery thereof
A technology for lithium-ion batteries and cathode materials, which is applied in battery electrodes, secondary batteries, circuits, etc., and can solve problems such as unsatisfactory anti-over-discharge solutions for lithium-ion batteries
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[0032] Among them, the separator can be selected from various separators used in lithium-ion batteries known to those skilled in the art, such as polyolefin microporous membrane (PP), polyethylene felt (PE), glass fiber felt or ultrafine glass fiber paper or PP / PE / PP. As a preferred embodiment, the separator is PP / PE / PP.
[0033] The electrolyte contains lithium salt and non-aqueous solvent. The lithium salt can be lithium hexafluorophosphate, lithium tetrafluoroborate, lithium hexafluoroarsenate, lithium perchlorate, lithium trifluoromethanesulfonate, lithium perfluorobutylsulfonate, aluminate One or more of lithium, lithium chloroaluminate, lithium fluorosulfonyl imide, lithium chloride and lithium iodide; the non-aqueous solvent can be γ-butyrolactone, ethyl methyl carbonate, methyl propyl carbonate , dipropyl carbonate, acid anhydride, N-methylpyrrolidone, N-methylformamide, N-methylacetamide, acetonitrile, N,N-dimethylformamide, sulfolane, dimethylsulfoxide, disulfite ...
Embodiment 1
[0038] (1) Preparation of positive electrode:
[0039] 80g of lithium iron phosphate with a maximum particle size of 4 microns (D 50 =0.5 μm), 10g Li 1.01 Ni 0.89 mn 0.1 o 2 , 10g of iron phosphate with a minimum particle size of 30 microns (D 50 =40 microns), 4g of polyvinylidene fluoride (PVDF), 5g of conductive agent SP (super conductive carbon black), 0.5g of dispersant polyvinylpyrrolidone (PVP) and 120g of N-methylpyrrolidone were added to the vacuum mixer Stir to form a homogeneous cathode slurry. The positive electrode slurry was evenly coated on both sides of an aluminum foil with a thickness of 16 microns, then dried at 150° C., rolled and cut to obtain a positive electrode sheet with a size of 453*40 mm.
[0040] (2) Preparation of negative electrode:
[0041] Add 50g of natural graphite, 1g of binder styrene-butadiene rubber latex (SBR), 0.5g of binder carboxymethyl cellulose (CMC), and 125g of deionized water into a vacuum mixer and stir to form a unifo...
Embodiment 2
[0045] Adopt the same method and steps as in Example 1 to prepare the positive electrode, negative electrode and battery, the difference is the configuration of the positive electrode slurry: 84g lithium iron phosphate, 5g Li 1.076 Ni 0.628 mn 0.624 o 2 , 3 g Li 2 mn 2 o 4 , 10g of iron phosphate with a minimum particle size of 30 microns, 4g of polyvinylidene fluoride (PVDF), 5g of conductive agent SP, 0.5g of dispersant polyvinylpyrrolidone (PVP) and 120g of N-methylpyrrolidone were added to the vacuum mixer Stir to form a homogeneous cathode slurry.
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