A kind of ternary positive electrode material and its preparation method and lithium ion battery
A cathode material, lithium source technology, applied in battery electrodes, secondary batteries, circuits, etc., can solve the problems of reducing electronic conductivity, voltage window mismatch, reducing the capacity of composite materials, etc., to achieve low cost, good safety, The effect of high specific capacity
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Embodiment 1
[0080] In this embodiment, the ternary positive electrode material is prepared according to the following method:
[0081] (1) Add 100g of carbon nanotubes to 100mL of 56% nitric acid, heat and reflux at 75°C for 13h, then clean the acidified carbon nanotubes with deionized water to neutrality to obtain carboxylated carbon nanotubes ;
[0082] (2) 12 mmol tetraethyl orthosilicate was dissolved in 100 mL n-butanol, and 1.5 g of nitric acid with a mass fraction of 64% was added to form a silicon source reaction solution;
[0083] (3) 30mmol of lithium hydroxide and 14.9mmol of manganese acetate were dissolved in 100mL of distilled water, and then 7mmol of oxalic acid and 0.23g of carboxylated carbon nanotubes were added to obtain the first dispersion;
[0084] (4) Add 40 mL of silicon source reaction solution dropwise to 32.2 mL of the first dispersion, and stir for 3 hours at room temperature (25° C.) to obtain a second dispersion; in the second dispersion, silicon source and ...
Embodiment 2
[0089] In this embodiment, the ternary positive electrode material is prepared according to the following method:
[0090] (1) Add 100g of carbon nanotubes to 100mL of 68% nitric acid, heat and reflux at 65°C for 24h, then clean the acidified carbon nanotubes with deionized water to neutrality to obtain carboxylated carbon nanotubes ;
[0091] (2) Dissolve 25 mmol tetraethyl orthosilicate in 100 mL isopropanol, add 0.1 g of 44% nitric acid by mass fraction to form a silicon source reaction solution;
[0092] (3) Dissolve 35mmol lithium carbonate and 17.2mmol manganese oxalate in 100mL distilled water, then add 10mmol acetic acid and 0.33g carboxylated carbon nanotubes to obtain the first dispersion;
[0093] (4) Add 40 mL of silicon source reaction solution dropwise to 58.1 mL of the first dispersion, and stir for 2 hours at room temperature (20° C.) to obtain a second dispersion; in the second dispersion, silicon source and manganese The molar ratio of elements is 1:1;
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Embodiment 3
[0098] In this embodiment, the ternary positive electrode material is prepared according to the following method:
[0099] (1) Add 100g of carbon nanotubes to 100mL of 52% nitric acid, heat and reflux at 55°C for 7h, then clean the acidified carbon nanotubes with deionized water to neutrality to obtain carboxylated carbon nanotubes ;
[0100] (2) 14 mmol tetraethyl orthosilicate was dissolved in 100 mL ethanol, and 0.6 g of 60% by mass fraction of nitric acid was added to form a silicon source reaction solution;
[0101] (3) 45mmol of lithium acetate and 22.4mmol of manganese carbonate were dissolved in 100mL of distilled water, and then 8mmol of formic acid and 0.64g of carboxylated carbon nanotubes were added to obtain the first dispersion;
[0102] (4) Add 40 mL of silicon source reaction solution dropwise to 25 mL of the first dispersion, and stir for 4 hours at room temperature (30° C.) to obtain a second dispersion; in the second dispersion, silicon source and manganese...
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