A kind of positive electrode material of honeycomb lithium ion battery and preparation method thereof
A technology for lithium ion batteries and positive electrode materials, applied in battery electrodes, circuits, electrical components, etc., can solve the problems affecting the wide application of lithium manganate, achieve good cycle performance and electrochemical stability, and meet the effect of simple preparation
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Embodiment 1
[0016] Add lithium carbonate and manganese dioxide into the ball mill tank at a molar ratio of 1:4, and ball mill at 250r / min for 6-10h. Transfer the ball mill product to a muffle furnace for heat treatment: first raise the temperature at 3°C / min to 500°C and keep it for 3 hours, then raise the temperature at 3°C / min to 780°C and keep it for 10 hours, then cool down with the furnace to obtain pure phase lithium manganate ( LiMn 2 o 4 ).
[0017] Dissolve 2g of polyvinylpyrrolidone in 40mL of absolute ethanol, stir magnetically until completely dissolved, add 8ml of tetrabutyl titanate, then add 8ml of glacial acetic acid solution, and stir magnetically to obtain a titanium sol.
[0018] Accurately weigh 0.296g of titanium sol, add it to 15ml of absolute ethanol, stir magnetically for 10min, then add 2.66g of LiMn 2 o 4 Add and stir for 1h to make it evenly mixed. Transfer it to a 70°C constant temperature drying oven to completely volatilize the ethanol, then place it in ...
Embodiment 2
[0020] The preparation of pure phase lithium manganate is the same as in Example 1.
[0021] Dissolve 2g of polyvinylpyrrolidone in 40mL of absolute ethanol, stir magnetically until completely dissolved, add 8ml of tetrabutyl titanate, then add 8ml of glacial acetic acid solution, and stir magnetically to obtain a titanium sol.
[0022] Accurately weigh 0.664g of titanium sol, add it to 15ml of absolute ethanol, stir magnetically for 10min, and then add 2.60g of LiMn 2 o 4 Added to ethanol and stirred for 1h to make it evenly mixed. Transfer it to a 70°C constant temperature drying oven to completely volatilize the ethanol, then place it in a muffle furnace for heat treatment, raise the temperature to 600°C at 3°C / min, keep it for 30 minutes, and cool down with the furnace to obtain modified lithium manganate sample. Accurately weigh the prepared modified lithium manganate cathode material, acetylene black and PVDF at a mass ratio of 85:10:5, grind and mix them thoroughly w...
Embodiment 3
[0024] The preparation of pure phase lithium manganate is the same as in Example 1.
[0025] Dissolve 2g of polyvinylpyrrolidone in 40mL of absolute ethanol, stir magnetically until completely dissolved, add 8ml of tetrabutyl titanate, then add 8ml of glacial acetic acid solution, and stir magnetically to obtain a titanium sol.
[0026] Accurately weigh 1.09g of titanium sol, add it to 15ml of absolute ethanol, stir magnetically for 10min, then add 2.54g of LiMn 2 o 4 Added to ethanol and stirred for 1h to make it evenly mixed. Transfer it to a 70°C constant temperature drying oven to completely volatilize the ethanol, then place it in a muffle furnace for heat treatment, raise the temperature to 600°C at 3°C / min, keep it for 30 minutes, and cool down with the furnace to obtain modified lithium manganate sample.
[0027] Accurately weigh the prepared modified lithium manganate cathode material, acetylene black and PVDF at a mass ratio of 85:10:5, grind and mix them thorough...
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