Composite material adopting conductive electron/conductive ion polymer to coat ternary positive electrode material and preparation method thereof
A technology of ionic polymers and positive electrode materials, which is applied in the field of preparation of advanced energy storage materials, can solve problems affecting electron transport and local ion transport, and achieve the effects of simple process, excellent electrochemical performance, and reduced side reactions
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Embodiment 1
[0025] Accurately weigh 0.5g (molecular weight is 150000) polyacrylonitrile, concrete structural formula is as follows: Add it into a beaker containing 17 g of dimethylformamide, seal it and stir at room temperature for 20 min to obtain a polymer solution. Weigh 5g lithium nickel cobalt manganate (LiNi 0.8 co 0.1 mn 0.1 o 2 ) into the polymer solution, seal and sonicate for 5 minutes, then stir and disperse at 25°C for 20 hours. Afterwards, the mixture was dried at 30 °C for 20 h. Finally, the obtained material was heat-treated at 220 °C for 1 h to obtain a partially cyclized nitrile polymer-coated ternary cathode material.
[0026] Accurately weigh the partially cyclized nitrile-based polymer-coated ternary positive electrode material, 0.03g of polyvinylidene fluoride and 0.03g of conductive carbon black, grind for 6 minutes and mix well. The mixture was then stirred in methylpyrrolidone for 6 min to form a homogeneous slurry. The homogeneous slurry was deposited on a...
Embodiment 2
[0028] Accurately take by weighing 0.3g (molecular weight is 10000) polyacrylonitrile, concrete structural formula is as follows:
[0029] Add it into a beaker containing 8 g of dimethylacetamide, seal it and stir at room temperature for 20 min to obtain a polymer solution. Weigh 5g lithium nickel cobalt manganate (LiNi 0.6 co 0.2 mn 0.2 o 2 ) into the polymer solution, sealed and sonicated for 6 minutes, and then continuously stirred and dispersed at 35°C for 16 hours. Afterwards, the mixture was dried at 60 °C for 15 h to obtain the primary product. Finally, the primary product was heat-treated at 300 °C for 0.5 h to obtain a partially cyclized nitrile polymer-coated ternary cathode material.
[0030] The same method as in Example 1 was used to prepare a button battery.
Embodiment 3
[0032] Accurately weigh 0.4g (molecular weight between 200-50000) poly(divinylacetylene); wherein the trimer structural formula is as follows:
[0033]
[0034] Add it into a beaker containing 5 g of dimethylformamide, seal it and stir at room temperature for 20 min to obtain a polymer solution. Weigh 5g lithium nickel cobalt aluminate (LiNi 0.8 co 0.15 al 0.05 o 2 ) into the polymer solution, sealed and sonicated for 8 minutes, then stirred and dispersed at 40° C. for 6 hours; after that, the mixture was suction-filtered and dried at 80° C. for 10 hours to obtain the primary product. Finally, the primary product was heat-treated at 300 °C for 1 h to obtain a partially cyclized alkynyl polymer-coated ternary cathode material.
[0035] The same method as in Example 1 was used to prepare a button battery.
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