A kind of lithium titanate and lithium nickel cobalt oxide system lithium ion battery and preparation method thereof
A technology of lithium-ion batteries and lithium nickel-cobalt oxide, which is applied in the field of lithium-ion power batteries, can solve the problems of low battery voltage and achieve the effects of large capacity, high volume specific energy, and long cycle life
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Embodiment 1
[0034] Cathode materials include: 92% lithium nickel cobalt oxide, 5% W811, 3% SP;
[0035] Negative electrode materials include: 91% lithium titanate, 3% PVDF, 6% SP;
[0036] Li-ion battery preparation steps are as follows:
[0037] 1) Dissolve lithium nickel cobaltate, W811, and SP in pure water as positive electrode slurry, and dissolve lithium titanate, PVDF, and SP in NMP as negative electrode slurry;
[0038] 2) The positive and negative electrode slurries are stirred evenly at high speed by a double planetary power mixer respectively, and enter the coating process after eliminating air bubbles and iron filings;
[0039] 3) Both the positive and negative electrode current collectors are made of aluminum foil. The slurry is evenly coated on the positive and negative electrode slurry on the current collector through the automatic feeding system and coating machine. After coating, the electrode roll is 110 After baking at ℃ for 6 hours, roll and cut into pole pieces;
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Embodiment 2
[0045] Cathode materials include: 95% lithium nickel cobalt oxide, 3% PVDF, 1% superconducting carbon black, 1% SP;
[0046] Negative electrode materials include: 95% lithium titanate, 2% PVDF, 3% conductive graphite;
[0047] Li-ion battery preparation steps are as follows:
[0048] 1) Dissolve lithium nickel cobaltate, PVDF, superconducting carbon black, and SP in NMP as a positive electrode slurry, and dissolve lithium titanate, PVDF, and conductive graphite in NMP as a negative electrode slurry;
[0049] 2) The positive and negative electrode slurries are stirred evenly at high speed by a double planetary power mixer respectively, and enter the coating process after eliminating air bubbles and iron filings;
[0050] 3) Both the positive and negative electrode current collectors are made of aluminum foil, and the slurry is evenly coated on the positive and negative electrode slurry on the current collector through an automatic feeding system and a coating machine. After b...
Embodiment 3
[0054] Cathode materials include: 85% lithium nickel cobalt oxide, 5% W811, 5% W812, 5% SP;
[0055] Negative electrode materials include: 85% lithium titanate, 5% PVDF, 5% carbon nanotubes, 5% conductive graphite;
[0056] Li-ion battery preparation steps are as follows:
[0057] 1) Dissolve lithium nickel cobaltate, W811, W812, and SP in pure water as a positive electrode slurry, and dissolve lithium titanate, PVDF, carbon nanotubes, and conductive graphite in NMP as a negative electrode slurry;
[0058] 2) The positive and negative electrode slurries are stirred evenly at high speed by a double planetary power mixer respectively, and enter the coating process after eliminating air bubbles and iron filings;
[0059] 3) Both the positive and negative electrode current collectors are made of aluminum foil, and the slurry is evenly coated on the positive and negative electrode slurry on the current collector through an automatic feeding system and a coating machine. After bakin...
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