A kind of preparation method of lithium-ion battery cathode with high rate performance
A lithium-ion battery, high-rate technology, applied in the field of preparation of lithium-ion battery positive electrode, can solve the problems of large internal resistance of the pole piece, poor battery cycle life, etc., and achieve the effects of improving conductivity, improving stability, and low resistance
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Embodiment 1
[0028] 1), providing lithium nickel oxide, the molecular formula of the lithium nickel oxide is LiNi 0.7 co 0.29 Nb 0.01 o 2 ; The average particle diameter of the lithium nickel oxide is 500nm, and the aspect ratio is 1.0, the lithium nickel oxide and acetylene black are mixed with a mass ratio of 100:3, placed in a ball mill jar, and heated at a speed of 200r / min Speed ball milling for 6h;
[0029] 2), add the solvent into the first vacuum stirred tank, add PVDF into the first vacuum stirred tank, stir in vacuum for 2 hours, then add sodium carboxymethyl cellulose, stir in vacuum for 1 hour, add the product of step 1, and stir in vacuum 4h, adding carbon nanofibers with a length of 5 microns, and stirring in a vacuum for 4h to obtain the first slurry, the solid content of the first slurry is 50%, wherein the mass ratio, the lithium nickel oxide: acetylene black: PVDF : sodium carboxymethyl cellulose: carbon nanofibers=100:3:4:2:5;
[0030] 3), providing doped lithium ...
Embodiment 2
[0035] 1), providing lithium nickel oxide, the molecular formula of the lithium nickel oxide is LiNi 0.82 co 0.15 Ti 0.03 o 2 The average particle diameter of described lithium nickel oxide is 2000nm, aspect ratio is 1.2, described lithium nickel oxide and acetylene black are mixed with the mass ratio of 100:6, are placed in ball mill tank, with 300r / min Speed ball milling for 8 hours;
[0036] 2), add the solvent into the first vacuum stirred tank, add PVDF into the first vacuum stirred tank, stir in vacuum for 4 hours, then add sodium carboxymethylcellulose, stir in vacuum for 2 hours, add the product of step 1, and stir in vacuum 6h, add carbon nanofibers with a length of 20 microns, and stir in vacuum for 6h to obtain the first slurry, the solid content of the first slurry is 54%, wherein the mass ratio, the lithium nickel oxide: acetylene black: PVDF : sodium carboxymethyl cellulose: carbon nanofibers=100:6:8:4:8;
[0037] 3), providing doped lithium manganese coba...
Embodiment 3
[0042] 1), providing lithium nickel oxide, the molecular formula of the lithium nickel oxide is LiNi 0.7 co 0.29 Nb 0.01 o 2 ; The average particle diameter of the lithium nickel oxide is 1000nm, and the aspect ratio is 1.2, the lithium nickel oxide is mixed with acetylene black at a mass ratio of 100:5, placed in a ball mill jar, and heated at a speed of 300r / min Speed ball milling for 8 hours;
[0043] 2), add the solvent into the first vacuum stirred tank, add PVDF into the first vacuum stirred tank, stir in vacuum for 4 hours, then add sodium carboxymethylcellulose, stir in vacuum for 2 hours, add the product of step 1, and stir in vacuum 6h, add carbon nanofibers with a length of 10 microns, and stir in vacuum for 6h to obtain the first slurry, the solid content of the first slurry is 52%, wherein the mass ratio, the lithium nickel oxide: acetylene black: PVDF : sodium carboxymethyl cellulose: carbon nanofibers=100:5:6:3:7;
[0044] 3), providing doped lithium mang...
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