Positive pole piece of lithium ion battery, and preparation method and application thereof
A technology for lithium-ion batteries and positive pole pieces, applied in battery electrodes, non-aqueous electrolyte battery electrodes, secondary batteries, etc., can solve the problems of multi-active Li consumption, reduce battery energy density, etc. High compaction density, the effect of dense particle filling
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Embodiment 1
[0055] This embodiment provides a lithium-ion battery positive pole piece, the lithium-ion battery positive pole piece comprises secondary spherical lithium iron phosphate, LFO, and conductive carbon with a mass ratio of 95:5:1:0.5:1:40. Black, conductive carbon nanotubes, polyvinylidene fluoride and nitrogen methyl pyrrolidone; the particle diameter D of the LFO min 0.41μm, D 10 1.8 μm, D 50 9.6 μm, D 90 27.1 μm, D min +D 10 +D 50 is 11.81 μm, the particle size D of the spherical lithium iron phosphate 50 is 8.6 μm; the preparation method of the lithium-ion battery positive pole piece comprises the steps:
[0056] Secondary spherical lithium iron phosphate and LFO are stirred and mixed at a mass ratio of 95:5 at 800r / min to obtain active powder; conductive carbon black, conductive carbon nanotubes, polyvinylidene fluoride and nitrogen methyl pyrrolidone are mixed at a ratio of 1:0.5:1 : The mass ratio of 40 is stirred and mixed with 800r / min to obtain conductive paste;...
Embodiment 2
[0059] This embodiment provides a positive pole piece of a lithium-ion battery, the positive pole piece of the lithium-ion battery includes nano-form lithium iron phosphate, LFO, conductive carbon black, polytetrafluoroethylene Vinyl fluoride and ethanol; the particle size D of the LFO min 0.3μm, D 10 2.3 μm, D 50 8.0 μm, D 90 25 μm, D min +D 10 +D 50 is 10.6 μm, the particle size D of the nano-form lithium iron phosphate 50 is 1.6 μm; the preparation method of the lithium-ion battery positive pole piece comprises the steps:
[0060] Nano-form lithium iron phosphate and LFO are stirred and mixed at a mass ratio of 93:3 at 700r / min to obtain active powder; conductive carbon black, polytetrafluoroethylene and ethanol are stirred and mixed at a mass ratio of 1.3:0.5:45 at 900r / min to obtain conductive powder Slurry: Stir and mix active powder and conductive paste at 700r / min for 1.5h to obtain slurry;
[0061] Coat the slurry on an aluminum foil, dry it at 115°C for 25 mi...
Embodiment 3
[0063] This embodiment provides a lithium-ion battery positive pole piece, the lithium-ion battery positive pole piece comprises a secondary spherical shape ternary material LiNi with a mass ratio of 97:7:1.7:1.25:35 0.7 co 0.1 mn 0.2 o 2 , LNO, conductive carbon nanofibers, polyvinylpyrrolidone and ethylene carbonate; the particle diameter D of the LNO min 0.5μm, D 10 1.3μm, D 50 9 μm, D 90 30μm, D min +D 10 +D 50 is 10.8 μm, the secondary spherical morphology ternary material LiNi 0.7 co 0.1 mn 0.2 o 2 Particle size D 50 is 13 μm; the preparation method of the lithium-ion battery positive pole piece comprises the steps:
[0064] Ternary material LiNi with secondary spherical shape 0.7 co 0.1 mn 0.2 o 2 Stir and mix with LNO at a mass ratio of 97:7 at 900r / min to obtain an active powder; conduct conductive carbon nanofibers, polyvinylpyrrolidone and ethylene carbonate at a mass ratio of 1.7:1.25:35 at a mass ratio of 700r / min to obtain a conductive paste; St...
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