Quickly chargeable lithium ion battery and its making method

A lithium-ion battery, fast charging technology, applied in battery electrodes, secondary batteries, sustainable manufacturing/processing, etc. The effect of discharge performance

Inactive Publication Date: 2008-09-10
TIANJIN B&M SCI & TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Therefore, the fast charging effect of this system is poor, and it cannot meet th

Method used

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  • Quickly chargeable lithium ion battery and its making method
  • Quickly chargeable lithium ion battery and its making method
  • Quickly chargeable lithium ion battery and its making method

Examples

Experimental program
Comparison scheme
Effect test

preparation example Construction

[0031] The preparation method of the rapidly chargeable lithium ion battery of the present invention comprises the following steps:

[0032] 1) Dissolve 70%-98% by weight of submicron lithium titanate, 1%-15% by weight of conductive agent and 1%-10% by weight of binder in a solvent to make a negative electrode slurry, with a thickness of 10 μm The copper foil is the current collector, and the negative electrode slurry is applied to the copper foil and dried to make a pole piece, and then the pole piece is rolled and sheared to make a negative electrode;

[0033] 2) Dissolve 70%-98% by weight of lithium manganate, 1%-10% conductive agent and 1%-10% binder in a solvent to make positive electrode slurry, and use 15μm thick aluminum foil as current collector , the positive electrode slurry is coated on the aluminum foil and dried to make a pole piece, and then the pole piece is rolled and sheared to make a negative electrode;

[0034] 3) The special polypropylene resin separator ...

Embodiment 1

[0042] By mass percentage (the same below), 85% of the positive active material lithium manganate, 5% of the super conductive carbon black, 10% of the binder polyvinylidene fluoride, with N-methylpyrrolidone as the solvent, to prepare a paste Using 15 μm thick aluminum foil as the current collector, the paste was applied to the aluminum foil and dried.

[0043] The pole piece is rolled, sheared and welded to make a positive pole piece, and the electrode density is 2.9g / cm 3 .

[0044] 80% of the anode material submicron lithium titanate (D 50 is 0.185μm, and the specific surface area is 5.2m 2 / g) mixed with 8% super conductive carbon black and 12% binder polyvinylidene fluoride, using N-methylpyrrolidone as a solvent to make a paste, and using a 10 μm thick copper foil as a current collector, the paste was coated onto copper foil and dry.

[0045] The pole piece is rolled, sheared and welded to make a negative pole piece, and the electrode density is 3.8g / cm 3 .

[0046...

Embodiment 2

[0052] Different from Example 1, the proportions of the positive electrode material lithium manganate, superconducting carbon black and the binder are respectively: 90%, 3% and 7%; the negative electrode material in the negative electrode is submicron lithium titanate. The proportions of , super conductive carbon black and binder are: 87%, 5% and 8% respectively.

[0053] The square lithium-ion battery prepared as ICP053048 is charged with a current of 10ItA and can be charged to 82.8% in 5 minutes.

[0054] The charge and discharge curves and cycle curves of the fabricated batteries at different currents are shown in Figure 2 to Figure 4 .

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Abstract

The invention discloses a lithium-ion battery with fast charge property, which comprises an anode, a cathode, a diaphragm sandwiched between the anode and the cathode and an organic electrolyte, wherein, sub micrometer lithium titanate is used as the active substance of the cathode; one or several materials of lithium manganate (LiMn2O4), lithium iron phosphate (LiFePO4), lithium nickel cobalt oxide (LiNixCoyMzO2), ternary substance(LiNixMnxCo1-2xO2) are used as active materials of the anode, or a mixture of lithium cobalt (LiCoO2) and one of lithium manganate (LiMn2O4), lithium iron phosphate (LiFePO4), lithium nickel cobalt oxide (LiNixCoyMzO2), ternary substance(LiNixMnxCo1-2xO2) is adopted as the active materials of the anode; lithium hexafluorophosphate (LiPF6) is adopted as the electrolyte, and a multicomponent mixture of ethylene carbonate (EC), dimethylcarbonate(DMC), Ethyl Methyl Carbonate (EMC) is used as a solution. The invention also discloses a preparation method of the lithium-ion battery with fast charged property. The lithium-ion battery of the invention has excellent fast charging and discharging performance.

Description

technical field [0001] The invention relates to the technical field of lithium ion battery energy, in particular to a fast chargeable lithium ion battery and a preparation method thereof. Background technique [0002] Li-ion batteries have the characteristics of high specific energy, high voltage platform, long cycle life, wide operating temperature range, no memory effect, and environmental friendliness. Since their inception, they have developed rapidly and are widely used in various military and civilian applications. Portable electrical appliances, such as mobile phones, notebook computers, power tools, electronic instruments, etc., are gradually applied to electric vehicles, armed equipment, etc. [0003] In previous research and applications, the discharge performance, safety performance, and storage performance of lithium-ion batteries were mainly assessed, and the charging performance of lithium-ion batteries was generally not required. However, with the application...

Claims

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Application Information

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IPC IPC(8): H01M10/40H01M4/58H01M4/48H01M4/36H01M10/38H01M4/62
CPCY02E60/122Y02E60/10Y02P70/50
Inventor 吴孟涛徐宁肖彩英周大桥孟凡玉黄来和
Owner TIANJIN B&M SCI & TECH
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