Preparation method for positive electrode material of secondary lithium battery
By first forming a phosphate coating layer in the secondary lithium battery cathode material and then adding the lithium source, the problem in the existing technology that the coating amount affects the capacity and the bonding is unstable is solved, and high specific capacity and cycle performance are achieved. and safety performance improvements.
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Embodiment 1
[0031] The host material of the cathode material prepared in this example is Li 1.09 Ni 0.1 co 0.5 mn 0.4 o 2 , whose cladding material is Li 1.09 Ni 0.1 co 0.5 mn 0.4 PO 4 . Among them, Li 1.09 Ni 0.1 co 0.5 mn 0.4 o 2 Synthesized by precipitation method, the specific preparation steps are:
[0032] First, the intermediate product of the host material was synthesized by co-precipitation method: NiSO 4 、CoSO 4 , MnSO 4 Dissolve in deionized water according to the metal atomic ratio of 0.1:0.5:0.4, and configure a mixed solution with a total concentration of 1mol / L; then add the configured 1mol / L NaOH solution to the above solution, stir while adding, and the temperature Control at 75°C; after full reaction, evacuated secondary spherical particles are formed, with an average particle size of 20μm-21μm, and the resulting precipitate is washed with deionized water and ethanol several times; Sinter for 5 hours;
[0033] Then, by mass ratio 0.0024:1 P 2 o 5 Mix...
Embodiment 2
[0036] The host material of the cathode material prepared in this example is Li 1.10 Ni 1 / 3 co 1 / 3 mn 1 / 3 o 2 , whose cladding material Li 1.10 Ni 1 / 3 co 1 / 3 mn 1 / 3 PO 4 . Among them, Li 1.10 Ni 1 / 3 co 1 / 3 mn 1 / 3 o 2 Synthesized by precipitation method, the specific preparation steps are:
[0037] First, the precursor was synthesized by co-precipitation method: NiSO 4 、CoSO 4 , MnSO 4 Dissolve in deionized water according to the atomic ratio of 1.0:1.0:1.0, and configure a mixed solution with a total concentration of 1mol / L; then add the prepared 1mol / L NaOH solution to the above solution, stir while adding, and control the temperature At 75°C; after full reaction, evacuated secondary spherical particles are formed with an average particle size of 50 μm, and the resulting precipitate is washed with deionized water and ethanol several times;
[0038] Then, according to the mass ratio of 0.0001:1 (NH 4 ) 3 PO 4 Mix with the above resultant, and mix in a plan...
Embodiment 3
[0041] The host material of the cathode material prepared in this example is Li 1.08 Ni 0.5 co 0.2 mn 0.3 o 2 , whose cladding material Li 1.08 Ni 0.5 co 0.2 mn 0.3 PO 4 . Among them, Li 1.08 Ni 0.5 co 0.2 mn 0.3 o 2 It is synthesized by combustion method, and the specific preparation steps are as follows:
[0042] First, nickel nitrate, cobalt nitrate, and manganese nitrate are dissolved in ethanol at an atomic ratio of 0.50:0.20:0.30; after all substances are completely dissolved, glycerol is added, and the ratio of glycerol to total metal ions is 3:1; Put the above solution into a water bath at 80°C and stir to evaporate the ethanol; when the ethanol is completely evaporated, transfer the container to a resistance furnace for heating until it is fully burned; collect the obtained black matter and calcinate it at 750°C in an air atmosphere After 5 hours, particles with an average particle size of 0.5-0.8 μm are formed;
[0043] Then, by mass ratio 0.10:1 H 3...
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