Nano titanium dioxide coated graphite lithium ion battery negative electrode material and preparation method thereof
A nano-titanium dioxide, lithium-ion battery technology, applied in the field of lithium-ion batteries, can solve the problems of difficulty in controlling reaction kinetics, unfavorable coatings, etc., and achieve the effects of promoting electrochemical processes, increasing interface surface area, and improving cycle performance and rate performance.
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Embodiment 1
[0019] Embodiment 1: a kind of nanometer TiO 2 Preparation method of coated graphite lithium ion battery negative electrode material
[0020] Graphite pretreatment: Disperse 3 g of graphite in 300 mL of dioxane, and ultrasonicate for 2 hours to obtain a dilute suspension of graphite.
[0021] TiO 2 Precursor solution preparation: add 2g tetrabutyl titanate, 10mL concentrated ammonia water (28wt%) to 100mL dioxane, the concentration of tetrabutyl titanate is about 2wt%, the concentration of ammonia water is 2.8wt%, stir well to get TiO 2 precursor solution.
[0022] The precursor solution was slowly added dropwise to the dilute suspension of graphite through a constant flow pump, and vigorously stirred at 70°C for 20h to obtain coated TiO 2 Graphite suspension of sol. Centrifuge or suction filter and collect the obtained graphite sample, wash, and freeze-dry to obtain gray-black powder.
[0023] The obtained powder sample was placed in a tube furnace and calcined at 700 °C...
Embodiment 2
[0027] Embodiment 2: a kind of nanometer TiO 2 Preparation method of coated graphite lithium ion battery negative electrode material
[0028] Graphite pretreatment: Disperse 10 g of graphite in 300 mL of cyclohexane, and ultrasonicate for 1 h to obtain a dilute suspension of graphite.
[0029] TiO 2 Precursor solution preparation: Add 0.5g tetraethyl titanate and 10mL concentrated ammonia water into 100mL cycloethane, the concentration of tetrabutyl titanate is 0.5wt%, the concentration of ammonia water is 2.8wt%, and stir fully to obtain TiO 2 precursor solution.
[0030] The precursor solution was slowly added dropwise to the dilute suspension of graphite through a constant flow pump, and vigorously stirred at 80°C for 20h to obtain a coated TiO 2 Graphite suspension of sol.
[0031] Graphite samples were collected by centrifugation, washed, and spray-dried to obtain gray-black powder. The powder sample was calcined in a tube furnace at 450 °C for 4 h under an inert atm...
Embodiment 3
[0032] Embodiment 3: electrochemical performance test
[0033] With the graphite sample (85wt%) that embodiment 1 or embodiment 2, comparative example 1 obtain, polyvinylidene fluoride (PVDF) (10wt%), carbon black (5wt%) and appropriate N-methylpyrrolidone (NMP) Mix the slurry and apply it on the copper foil to make pole pieces. Place the pole pieces in a vacuum oven at 110°C to dry overnight. A CR2032 button cell was made with lithium metal as the counter electrode.
[0034] The prepared nano-TiO of embodiment 1 2 The cycle and efficiency diagram of @C anode material cycled for 50 cycles at a current density of 75mA / g ( image 3 ), it can be seen from the figure that the capacity has almost no attenuation after cycling, the Coulombic efficiency remains above 98%, and the 50th cycle still has a specific discharge capacity of 345mAh / g. Example 2 has a similar effect, while Comparative Example 1 is due to the coating Uneven, the effect is not obvious. The prepared nano-TiO ...
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