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Lithium titanate-lithium nickel cobalt manganate lithium ion battery and preparation method thereof

A technology of nickel-cobalt lithium manganese oxide and lithium-ion batteries, which is applied in the field of lithium-ion power batteries and its preparation, can solve the problems of affecting the adhesion of PVDF, increasing manufacturing difficulty and cost, etc., to improve charge and discharge performance and reduce manufacturing difficulty , the effect of low processing cost

Inactive Publication Date: 2013-12-11
ZHUHAI LIYUAN NEW ENERGY TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Moreover, the water absorption of the NMP-PVDF solution during the production process will affect the adhesion of PVDF, and the water needs to be strictly controlled in the electrode manufacturing, thereby increasing the manufacturing difficulty and cost.

Method used

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  • Lithium titanate-lithium nickel cobalt manganate lithium ion battery and preparation method thereof
  • Lithium titanate-lithium nickel cobalt manganate lithium ion battery and preparation method thereof
  • Lithium titanate-lithium nickel cobalt manganate lithium ion battery and preparation method thereof

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Experimental program
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Effect test

preparation example Construction

[0034] The above-mentioned preparation method of lithium titanate and nickel cobalt lithium manganate system lithium ion battery comprises the following steps:

[0035] 1) Production of positive electrode sheet: Add positive electrode material according to the formula, add water to dissolve, stir evenly to obtain positive electrode slurry, coat positive electrode slurry on aluminum foil, and bake at 80-120°C for 5-12 hours in a vacuum environment Finally, roll pressing and cutting into positive electrode sheets;

[0036] 2) Production of negative electrode sheet: add negative electrode material according to the formula, add water to dissolve, stir evenly to obtain negative electrode slurry, coat negative electrode slurry on aluminum foil, and bake at 80-120°C for 5-12 hours in a vacuum environment Finally, roll pressing and cutting into negative electrode sheets;

[0037] 3) After baking the positive electrode and negative electrode in a vacuum environment at 60~120°C for 24~...

Embodiment 1

[0042] A lithium-ion battery of lithium titanate and nickel-cobalt-lithium manganese oxide system comprises a positive electrode, a negative electrode, a separator, an electrolytic solution, and a casing.

[0043] Cathode material composition: 85% nickel cobalt lithium manganate, 5% 103 gel, 10% SP;

[0044] Negative electrode material composition: 85% lithium titanate, 5% LA132, 10% SP;

[0045] Diaphragm: PP single-layer diaphragm;

[0046] Electrolyte: 1.0mol / L LiPF 6 Solution, the solvent composition is EC:DMC:EMC=1:1:1;

[0047] The shell is a plastic shell.

[0048] The specific preparation method is as follows:

[0049]1) Production of positive electrode sheet: add positive electrode material according to the formula, add water to dissolve, stir evenly with double star power mixer at high speed, eliminate air bubbles and iron filings, and obtain positive electrode slurry, pass positive electrode slurry through automatic feeding system and coating machine Evenly coa...

Embodiment 2

[0054] A lithium-ion battery of lithium titanate and nickel-cobalt-lithium manganese oxide system comprises a positive electrode, a negative electrode, a separator, an electrolytic solution, and a casing.

[0055] Composition of positive electrode materials: 90% nickel cobalt lithium manganese oxide, 7% 103A glue, 3% superconducting carbon black;

[0056] Negative electrode material composition: 85% lithium titanate, 10% LA132, 5% superconducting carbon black;

[0057] Diaphragm: PP single-layer diaphragm;

[0058] Electrolyte: 1.0mol / L LiPF 6 Solution, the solvent composition is EC:DMC:EMC=1:1:1;

[0059] The shell is a plastic shell.

[0060] The specific preparation method is as follows:

[0061] 1) Production of positive electrode sheet: add positive electrode material according to the formula, add water to dissolve, stir evenly with double star power mixer at high speed, eliminate air bubbles and iron filings, and obtain positive electrode slurry, pass positive electr...

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Abstract

The invention discloses a lithium ion battery of lithium titanate and nickel-cobalt lithium manganese oxide system. % by weight of conductive agent; its negative electrode material is composed of 85-95% by weight of lithium titanate (Li4Ti5O12), 1-10% by weight of water-based binder, and 2-10% by weight of conductive agent. The lithium-ion power battery of the invention has large capacity, excellent charge and discharge rate, long cycle life, high stability and safety performance, and can be applied to fields such as hybrid electric vehicles, large-scale energy storage systems, household energy storage power stations, and military products requiring high performance. The invention also discloses a preparation method of the lithium-ion power battery. The method uses water as a solvent, has low cost, simple and easy process, no environmental pollution, and can be popularized and applied in a wide range.

Description

technical field [0001] The invention relates to a lithium ion power battery and a preparation method thereof, in particular to a lithium ion battery of lithium titanate and nickel cobalt lithium manganese oxide system and a preparation method thereof. Background technique [0002] Lithium titanate negative electrode material is a new type of lithium ion secondary battery negative electrode material. In the process of lithium ion intercalation or extraction, the crystal form does not change, and the volume change is less than 1%, so it is called "zero-strain material", which can avoid the structural damage caused by the back and forth contraction of the electrode material during the charge-discharge cycle. Improve the cycle performance and service life of the electrode. At 25°C, Li 4 Ti 5 o 12 The chemical diffusion coefficient is 2×10 -8 cm 2 / s, which is much higher than that of carbon anode materials, and the high diffusion coefficient makes this anode material fast ...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): H01M10/0525H01M4/485H01M4/525H01M4/505H01M4/62H01M10/058
CPCY02E60/122Y02T10/7011Y02E60/10Y02P70/50
Inventor 李宝玉王保刘兴福
Owner ZHUHAI LIYUAN NEW ENERGY TECH