A kind of preparation method of lithium ion battery adopting lithium titanate negative electrode

A lithium-ion battery and lithium titanate technology, which is applied in the field of electrochemistry, can solve the problems of easy gas expansion of lithium titanate, and achieve the effects of preventing gas swelling, excellent rapid charge and discharge ability, and long cycle life

Active Publication Date: 2015-11-04
CENT SOUTH UNIV
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  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0006] The purpose of the present invention is to provide a preparation method of a lithium ion battery using a lithium titanate negative electrode, by filling electrolyte solutions with different compositions at different stages, and using two activation film formation, high temperature storage and multiple charge and discharge Post-degassing sealing and other methods to solve the problem of lithium titanate easy to inflate

Method used

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  • A kind of preparation method of lithium ion battery adopting lithium titanate negative electrode

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Effect test

Embodiment 1

[0043] Lithium manganate is used as the positive electrode active material of lithium ion batteries, mixed with binders, conductive agents, additives, solvents, etc. to prepare lithium manganate positive electrode slurry. Cut to get the positive electrode sheet.

[0044] Lithium titanate is used as the negative electrode active material, mixed with binder polyvinylidene fluoride, Super P conductive carbon, and additive phosphorus flake graphite at a mass ratio of 90:5:3:2, and mixed with solvent N-methylpyrrolidone, etc. Negative electrode slurry, current collector is copper foil, coated according to the ratio of negative electrode capacity to positive electrode capacity of 0.95, dried, rolled and punched to obtain negative electrode sheet.

[0045] The positive electrode sheet, negative electrode sheet and separator are combined by lamination, and assembled with composite tabs and aluminum-plastic film to form a 1072170 (thickness 10mm, width 72mm, length 170mm) type lithium ...

Embodiment 2

[0052] Lithium cobalt oxide is used as the positive electrode active material of lithium ion battery, mixed with binder, conductive agent, additive, solvent, etc. Positive sheet.

[0053] Lithium titanate is used as the negative electrode active material, mixed with binder polyvinylidene fluoride, Super P conductive carbon, and additive phosphorus flake graphite at a mass ratio of 95:3:2, and mixed with solvent N-methylpyrrolidone to prepare negative electrode slurry The current collector is copper foil, which is coated according to the ratio of the negative electrode capacity to the positive electrode capacity of 0.97, and then dried, rolled, and punched to obtain the negative electrode sheet.

[0054] The positive electrode sheet, negative electrode sheet and separator are combined by lamination, and assembled with composite tabs and aluminum-plastic film to form a 1072170 (thickness 10mm, width 72mm, length 170mm) type lithium titanate negative lithium-ion battery, nominal ...

Embodiment 3

[0061] Lithium nickel cobaltate is used as the positive electrode active material of lithium-ion batteries, mixed with binders, conductive agents, additives, solvents, etc. Get the positive electrode.

[0062] Lithium titanate is used as the negative electrode active material, mixed with binder polyvinylidene fluoride, Super P conductive carbon, and additive phosphorus flake graphite at a mass ratio of 93:4:2:1, and mixed with solvent N-methylpyrrolidone, etc. Negative electrode slurry, current collector is copper foil, coated according to the ratio of negative electrode capacity to positive electrode capacity of 0.97, dried, rolled and punched to obtain negative electrode sheet.

[0063] The positive electrode sheet, negative electrode sheet and separator are combined by lamination, and assembled with composite tabs and aluminum-plastic film to form a 1072170 (thickness 10mm, width 72mm, length 170mm) type lithium titanate negative lithium-ion battery, nominal Capacity 12Ah....

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Abstract

The invention discloses a preparation method of a lithium ion battery adopting a lithium titanate cathode. The preparation method comprises the following steps: preparing slurry; making an anode plate and a cathode plate, and assembling into a laminated flexible packaging battery together with a diaphragm; drying and dewatering; filling ionic liquid-containing electrolyte; performing film-forming activation primarily; filling commercial lithium ion battery electrolyte; performing film-forming activation secondarily; storing at high temperature; charging and discharging; degassing; sealing to obtain the lithium ion battery. By the preparation method, a dense and stable composite SEI film with excellent performance can be easily obtained on the surface of an electrode and a swelling phenomenon of the lithium ion battery using the lithium titanate cathode in charging and discharging processes can be effectively prevented; the developed lithium ion battery has the advantages of long cycle life, excellent rapid charging and discharging capacities and high safety.

Description

technical field [0001] The invention relates to a preparation method of a lithium ion battery using a lithium titanate negative electrode, belonging to the field of electrochemistry. Background technique [0002] Lithium-ion batteries have the advantages of high operating voltage, long cycle life, low self-discharge rate, and environmental protection. They have developed rapidly in recent years and have been widely used in the field of small mobile electronic appliances. With the rapid development of large-scale energy storage and power equipment such as hybrid electric vehicles, pure electric vehicles, base station energy storage, and grid energy storage, there is a huge demand for large-capacity, power-type lithium-ion batteries. [0003] Compared with small lithium-ion batteries, large-capacity lithium-ion batteries for energy storage and power have higher requirements for safety, fast charging and discharging, and cycle life. At present, commercial lithium-ion batteries...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): H01M10/058
CPCH01M4/485H01M10/0525H01M10/0569H01M10/058H01M10/446Y02E60/10Y02P70/50
Inventor 郭华军杨勇李新海王志兴彭文杰胡启阳
Owner CENT SOUTH UNIV
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