Surface coating method of cathode material for lithium-ion battery
A technology for lithium-ion batteries and positive electrode materials, applied in battery electrodes, secondary batteries, circuits, etc., can solve problems such as increasing the contact between electrolyte and electrode materials, increasing processing procedures and production costs, and being unable to control uniform carbon coating. , achieve good commercial application prospects, improve electrochemical performance, and improve the effect of reducing tap density
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[0025] Example 1: Preparation of Li-MgO and carbon-coated Li 1.2 Mn 0.56 Ni 0.16 Co 0.08 O 2
[0026] The finely ground Li 1.2 Mn 0.56 Ni 0.16 Co 0.08 O 2 Add to the solution containing magnesium acetate and LiOH, where magnesium accounts for 2% of the total mass of the cathode material, and Li accounts for 0.2% of the total mass of the cathode material. The mixed solution is sonicated for 2h, and then stirred at 60°C until it is dry. Drying in an oven at ℃ for 12h; the dried sample is heated in a tube furnace at 1℃ / min to 130℃ for 1h, and then heated at 2℃ / min to 600℃ for 2h, the whole process is tubular O in the furnace 2 . When the sample coated with Li-MgO drops to room temperature, switch the gas to CH 4 , O 2 And CO 2 Mixed gas, where CH 4 , O 2 And CO 2 The volume ratio is 5:1:4, then the temperature is raised to 500℃ for 1h, and finally it is reduced to room temperature.
[0027] figure 1 The charge-discharge diagram of the lithium-rich material after coating prepared in t...
Example Embodiment
[0029] Example 2: Preparation of Li-MgO and carbon-coated LiMn 0.2 Ni 0.6 Co 0.2 O 2
[0030] LiMn after grinding 0.2 Ni 0.6 Co 0.2 O 2 Add to the solution containing magnesium acetate and LiOH, where magnesium accounts for 2% of the total mass of the cathode material, and Li accounts for 0.2% of the total mass of the cathode material. The mixed solution is sonicated for 2h, and then stirred at 60°C until it is dry. Drying in an oven at ℃ for 12h; the dried sample is heated in a tube furnace at 1℃ / min to 130℃ for 1h, and then heated at 2℃ / min to 600℃ for 2h, the whole process is tubular O in the furnace 2 . When the sample coated with Li-MgO drops to room temperature, switch the gas to CH 4 , O 2 And CO 2 Mixed gas, where CH 4 , O 2 And CO 2 The volume ratio is 5:1:4, then the temperature is raised to 500℃ for 1h, and finally it is reduced to room temperature.
Example Embodiment
[0031] Example 3: Preparation of Li-MgO and carbon-coated Li 1.2 Mn 0.56 Ni 0.16 Co 0.08 O 2
[0032] The finely ground Li 1.2 Mn 0.56 Ni 0.16 Co 0.08 O 2 Add to the solution containing magnesium acetate and LiOH, where magnesium accounts for 5% of the total mass of the cathode material, and Li accounts for 0.5% of the total mass of the cathode material. The mixed solution is sonicated for 2h, and then stirred at 60°C until it is dry. Drying in an oven at ℃ for 12h; the dried sample is heated in a tube furnace at 1℃ / min to 130℃ for 1h, and then heated at 2℃ / min to 600℃ for 2h, the whole process is tubular O in the furnace 2 . When the sample coated with Li-MgO drops to room temperature, switch the gas to CH 4 , O 2 And CO 2 Mixed gas, where CH 4 , O 2 And CO 2 The volume ratio is 5:1:4, then the temperature is raised to 500℃ for 1h, and finally it is reduced to room temperature.
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