A method for preparing lithium silicate-coated nickel-cobalt lithium manganese oxide positive electrode material by anti-solvent method
A technology of nickel-cobalt lithium manganate and cathode material, which is applied in battery electrodes, structural parts, electrical components, etc., can solve the problem of large gap between primary particles of nickel-cobalt lithium manganate cathode material, stability needs to be improved, and electrochemical performance is affected. and other problems, to achieve the effects of good cycle stability and rate performance, reducing the gap between primary particles, and low cost
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Embodiment 1
[0028] A kind of Li 2 SiO 3 coated LiNi 0.8 co 0.1 mn 0.1 o 2 Cathode material:
[0029] The Li 2 SiO 3 The molar percentage of Li is 1%, Li 2 SiO 3 In LiNi 0.8 co 0.1 mn 0.1 o 2 The surface of the positive electrode material grows in situ to form a uniform coating layer; the positive electrode material is spherical particles with a particle diameter of 10-12 μm.
[0030] This embodiment includes the following steps:
[0031] (1) 3.694 g (40 mmol) Ni 0.8 co 0.1 mn 0.1 (OH) 2 Disperse in 10 mL of 0.008 M Li 2 Si 5 o 11 In the aqueous solution, add 0.027 g (0.64 mmol) LiOH · H 2 O and stirred to obtain a suspension;
[0032] (2) Add 50 mL of absolute ethanol to the above suspension and stir for 1 h, then evaporate to dryness at 80 °C to obtain powder;
[0033] (3) Mix the obtained powder with 1.779 g (42.4 mmol) LiOH · H 2 O was mixed and sintered at 780 °C for 12 h to obtain Li 2 SiO 3 coated LiNi 0.8 co 0.1 mn 0.1 o 2 Cathode material.
[0034] T...
Embodiment 2
[0038] A kind of Li 4 SiO 4 coated LiNi 0.8 co 0.1 mn 0.1 o 2 Cathode material:
[0039] The Li 4 SiO 4 The molar percentage of Li is 1%, Li 4 SiO 4 In LiNi 0.8 co 0.1 mn 0.1 o 2 The surface of the positive electrode material grows in situ to form a uniform coating layer; the positive electrode material is spherical particles with a particle diameter of 10-12 μm.
[0040] This embodiment includes the following steps:
[0041] (1) 3.694 g (40 mmol) Ni 0.8 co 0.1 mn 0.1 (OH) 2 Disperse in 40 mL of 0.01 M C 16 h 36 o 4 Si aqueous solution, add 0.067 g (1.6 mmol) LiOH · H 2 O and stirred to obtain a suspension;
[0042] (2) Add 60 mL of absolute ethanol to the above suspension and stir for 2 hours, then evaporate to dryness at 70 °C to obtain powder;
[0043] (3) Mix the obtained powder with 1.779 g (42.4 mmol) LiOH · H 2 O was mixed and sintered at 800 °C for 10 h to obtain Li 4 SiO 4 coated LiNi 0.8 co 0.1 mn 0.1 o 2 Cathode material.
[0044] Take...
Embodiment 3
[0048] A kind of Li 4 SiO 4 coated LiNi 0.8 co 0.15 Al 0.05 o 2 Cathode material:
[0049] The Li 4 SiO 4 The molar percentage of Li is 1%, Li 4 SiO 4 In LiNi 0.8 co 0.15 Al 0.05 o 2 The surface of the positive electrode material grows in situ to form a uniform coating layer; the positive electrode material is spherical particles with a particle diameter of 10-12 μm.
[0050] This embodiment includes the following steps:
[0051] (1) 3.671 g (40 mmol) Ni 0.8 co 0.15 Al 0.05 (OH) 2 Disperse in 40 mL of 0.01 M C 16 h 36 o 4 Si aqueous solution, add 0.067 g (1.6 mmol) LiOH · H 2 O and stirred to obtain a suspension;
[0052] (2) Add 80 mL of absolute ethanol to the above suspension and stir for 2 hours, then evaporate to dryness at 75 °C to obtain powder;
[0053] (3) Mix the obtained powder with 1.813 g (43.2 mmol) LiOH · H 2 O was mixed and sintered at 850°C for 10 h to obtain Li 4 SiO 4 coated LiNi 0.8 co 0.15 Al 0.05 o 2 Cathode material.
[005...
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