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

Inactive Publication Date: 2011-12-28
ZHUHAI LIYUAN NEW ENERGY TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Although the lithium iron phosphate material itself is safe, the battery voltage made by combining it with lithium titanate is low

Method used

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  • A kind of lithium titanate and lithium nickel cobalt oxide system lithium ion battery and preparation method thereof
  • A kind of lithium titanate and lithium nickel cobalt oxide system lithium ion battery and preparation method thereof

Examples

Experimental program
Comparison scheme
Effect test

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;

...

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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Abstract

A lithium-ion battery based on lithium titanate and lithium nickel cobaltate, the negative electrode material is composed of 85-95% lithium titanate, 3-10% binder, and 3-10% conductive agent, and the positive electrode material is nickel-cobalt acid Composed of 85-95% lithium, 3-10% binder, and 3-10% conductive agent; wherein, the percentages are all mass percentages. The positive and negative electrode materials are prepared by pulping, coating, lamination, liquid injection, chemical composition and other preparation methods to obtain lithium nickel cobaltate-lithium titanate battery. The lithium-ion battery involved in the present invention has large capacity, high safety performance, excellent charging and discharging rate, long cycle life, and high volume specific energy, and is more suitable for hybrid electric vehicles, photoelectric energy storage facilities, national defense application fields and high-standard electric energy storage systems And many other applications.

Description

technical field [0001] The invention belongs to the field of lithium-ion power batteries, and relates to a large-capacity, high-power lithium-ion power battery manufacturing technology in which lithium titanate is used as a negative electrode raw material and lithium nickel cobaltate binary material is used as a main material of the positive electrode. Background technique [0002] Lithium-ion batteries have become the first choice for the development of new batteries due to their high energy density, light volume, small weight, environmental protection and pollution-free. With the rapid development of electric vehicles, various backup or energy storage power sources, national defense industry, and power energy storage systems, higher requirements have been put forward for the high-current charging and discharging performance, energy density, cycle life, and safety of secondary batteries. requirements. [0003] As the main active material of traditional negative electrode, ...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H01M10/0525H01M4/525H01M4/62H01M10/058
CPCY02E60/122Y02T10/7011Y02E60/12Y02E60/10Y02P70/50
Inventor 李宝玉邵志勇原骏王保刘兴福
Owner ZHUHAI LIYUAN NEW ENERGY TECH
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