Polyquaternary triphenylamine and its application as a cathode material for lithium-ion batteries
A technology of polyquadruple triphenylamine and lithium-ion batteries, which is applied in the direction of battery electrodes, circuits, electrical components, etc., can solve the problem of low discharge specific capacity, and achieve increased free radical density, good cycle performance, and good charge and discharge voltage platform Effect
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Embodiment 1
[0047] Embodiment 1: polyquaterphenylamine, polytriphenylamine
[0048] Synthesis of quadruple triphenylamine: Add 4.8454g (15mmol) 4-bromotriphenylamine and 1.3016g (5mmol) N,N'-diphenyl-1,4-phenylenediamine to a pre-dried 250mL three-necked flask , 1.6872g (15mmol) potassium tert-butoxide, 0.05g palladium acetate, then add 40mL toluene solution, after stirring evenly, inject 5mL tri-tertbutylphosphine into the reaction system with a syringe under the protection of nitrogen, and reflux at 110°C for 12 Hour. After the reaction, the reaction solution was filtered, the filter cake was repeatedly washed with water and toluene, and dried to finally obtain the target product tetraphenyltriphenylamine as a gray-green solid, 3.28 g, with a yield of 87.90%. Quadruple triphenylamine NMR spectrum as shown figure 1 As shown, the mass spectrogram is as figure 2 shown. 1 H NMR (500MHz, CDCl 3 )δ7.25(t, J=7.8Hz, 12H), 7.11(t, J=6.7Hz, 12H), 7.04–6.94(m, 18H).MS(EI): calculated for C ...
Embodiment 2
[0056] The polyquaterphenylamine and polytriphenylamine obtained in Example 1 are respectively used as the active material of the positive electrode material, and the lithium-ion battery is prepared according to the following steps:
[0057] a) Weigh 0.01 g of binder powder (polyvinylidene fluoride: PVDF) and disperse it in 1 ml of N-methylpyrrolidone solvent, seal and stir, and slightly heat to obtain a bonding slurry.
[0058] b) Weigh 0.04g of acetylene black and 0.05g of the prepared polymer powder and mix them evenly.
[0059] c) Pour the mixture in b) into the bonding slurry in a), then add 3ml of N-methylpyrrolidone, stir and mix evenly to obtain a mixed slurry with moderate viscosity.
[0060] d) The slurry in c) is evenly coated on the aluminum foil, and then vacuum-dried in an oven at 60° C. for 24 hours to obtain a positive electrode sheet.
[0061] e) With the positive electrode sheet prepared in d) as the positive electrode, the metal lithium sheet as the negativ...
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