A polyaniline/polyethylene glycol co-wrapped composite ternary cathode material and its preparation and application
A polyethylene glycol and positive electrode material technology, applied in the field of lithium-ion batteries, can solve the problems of material ion conductivity decline, conductive polymer single coating, and coating difficulty
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Embodiment 1
[0040] Conductive polymer polyaniline (5612-44-2, doped with hydrochloric acid, Shandong Jiaying) and polyethylene glycol (1000M w , Shanghai Sinopharm) was dispersed in N-methylpyrrolidone solvent (1:10) at a mass ratio of 1:1, and stirred in a water bath at 50°C for 10 minutes to obtain a dispersion; slowly add LiNi to the dispersion 0.8 co 0.1 mn 0.1 o 2 Ternary materials, reacted for about 15 minutes, vacuum dried at 100°C after suction filtration, and obtained polyaniline-polyethylene glycol surface-modified LiNi 0.8 co 0.1 mn 0.1 o 2 Composite material, wherein the coating amount of the polymer is 5wt%.
[0041] figure 1 SEM images of ternary materials before and after modification. Depend on figure 1 It can be seen that there is basically no change in the morphology of the material after modification, and they are all spherical particles, indicating that the coating process will not damage the overall shape of the material; it can be seen from the figure that t...
Embodiment 2
[0046] Conductive polymer polyaniline (5612-44-2, doped with sulfuric acid, Shandong Jiaying) and polyethylene glycol (2000M w , Shanghai Sinopharm) was dispersed in a xylene solvent (1:15) at a mass ratio of 2:1, and stirred in a water bath at 60°C for 15 minutes to obtain a dispersion; slowly add LiNi to the dispersion 0.6 co 0.2 mn 0.2 o 2 Ternary materials, reacted for about 20 minutes, vacuum dried at 110°C after suction filtration, and obtained polyaniline-polyethylene glycol surface-modified LiNi 0.6 co 0.2 mn 0.2 o 2 Composite material, wherein the coating amount of polymer is 4wt%.
[0047] Figure 5 It is the cycle curve diagram of the ternary positive electrode material before and after modification at 1C current density, 25°C and 2.8-4.3V voltage range, from Figure 5 It can be seen that after the material before modification is cycled 100 times at 1C, the capacity of the material increases from 172.7mAh g -1 Rapidly decays to 145.4mAh·g -1 , the capacity...
Embodiment 3
[0049] Conductive polymer polyaniline (5612-44-2, doped with salicylic acid, Shandong Jiaying) and polyethylene glycol (3000M w , Shanghai Sinopharm) was dispersed in xylene solvent (1:20) at a mass ratio of 3:1, stirred in a water bath at 70°C for 15 minutes to obtain a dispersion; slowly added LiNi to the dispersion 0.5 co 0.2 mn 0.3 o 2 Ternary materials, reacted for about 25 minutes, vacuum dried at 90°C after suction filtration, and obtained polyaniline-polyethylene glycol surface-modified LiNi 0.5 co 0.2 mn 0.3 o 2 Composite material, wherein the coating amount of polymer is 6wt%.
[0050] Figure 6 It is the cycle graph of the ternary positive electrode material before and after modification at 1C current density, 25°C and 2.8-4.3V voltage interval, which is determined by Figure 6It can be seen that after the material before modification was cycled 100 times at 1C, the capacity of the material increased from 159.7mAh g -1 Rapidly decays to 130.5mAh·g -1 , the...
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