Laminated Li-ion secondary battery and method for producing the battery

A secondary battery and lithium ion technology, which is applied in secondary battery, electrolyte battery manufacturing, electrode manufacturing, etc., can solve the problems of low weight specific capacity, good cycle performance, high short circuit rate, etc., to improve cycle performance and increase battery capacity , Increase the effect of electrode weight specific capacity

Inactive Publication Date: 2008-07-02
BYD CO LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0006] The purpose of the present invention is to overcome the shortcomings of high short-circuit rate, low weight specific capacity, and poor cycle performance of stacked

Method used

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  • Laminated Li-ion secondary battery and method for producing the battery
  • Laminated Li-ion secondary battery and method for producing the battery

Examples

Experimental program
Comparison scheme
Effect test

preparation example Construction

[0014] The preparation method of the battery provided by the present invention includes the positive electrode current collector supporting the positive electrode material to obtain the positive electrode, the negative electrode current collector supporting the negative electrode material to obtain the negative electrode, a separator is arranged between the positive electrode and the negative electrode to form an electrode group, and the electrode group is contained in the battery The electrolyte is injected into the casing, and then the battery casing is hermetically sealed, wherein the positive electrode current collector and / or the negative electrode current collector are foamed metal, the thickness of the foamed metal is 0.5-3 mm, and the tensile strength is not less than 120 Newton / cm², porosity is not less than 80%. Preferably, the foam metal has a thickness of 1-2.5 mm, a tensile strength of 120-200 Newton / cm², and a porosity of 90-95%.

[0015] The method of loading the po...

Embodiment 1

[0029] This embodiment illustrates the positive electrode provided by the present invention, a preparation method thereof, and a lithium ion secondary battery including the positive electrode.

[0030] (1) Preparation of positive electrode

[0031] Dissolve 110 grams of polyvinylidene fluoride (PVDF) in about 1500 grams of N-methylpyrrolidone (NMP) solvent to prepare a binder solution, and then mix 3200 grams of lithium cobalt oxide (UM’s KD10 lithium cobalt oxide) with 30 Grams of acetylene black powder acting as a conductive agent was added to the above solution, fully stirred and mixed uniformly to prepare a positive electrode slurry; the positive electrode slurry was evenly coated with a stretcher to a thickness of 1.5 mm and a tensile strength of 125 Newtons / Square centimeters, the porosity of the aluminum foam is 92% on both sides, and the weight ratio of the positive electrode slurry to the positive electrode current collector is 15:1. After heating and drying in vacuum at...

Embodiment 2-5

[0041] The embodiments illustrate the positive electrode provided by the present invention, a preparation method thereof, and a lithium ion secondary battery including the positive electrode.

[0042] A positive electrode and a battery including the positive electrode were prepared according to the method of Example 1. The difference is that the material, thickness, tensile strength, porosity, and weight ratio of the electrode material of the electrode to the current collector are as shown in Table 1 below. Show.

[0043] Table 1

[0044]

[0045] Among them, the preparation method of the negative electrode of Example 4-5 is 960 grams of conductive graphite (soddif product, DAG22) powder, fully mixed with 40 grams of polyvinylidene fluoride (PVDF) as a binder, and dissolved to about 500 grams as a solvent. In the N-methylpyrrolidone, stir and mix well to obtain a negative electrode slurry. Use a stretcher to evenly coat the negative electrode slurry with a thickness of 1.5 mm, a...

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Abstract

The invention relates to a lamination core lithium iron secondary battery. The battery comprises a battery shell and an electrode group and electrolyte which are sealed in the battery shell. The electrode group comprises an anode, a cathode and a diaphragm arranged between the anode and the cathode. The anode comprises an anode current collector and anode material carried on the current collector and the cathode comprises a cathode current collector and cathode material carried on the current collector; the anode current collector and/or the cathode current collector are/is foam metal and the thickness of the foam metal is 0.5-3 millimeter, the tensile strength is not less than 120n/square meter and the porosity is not less than 80 per cent. The lamination core lithium iron secondary battery of the invention, by adopting the foam metal instead of the metal foil as the electrode current collector, increases the strength of the battery electrode and thereby reducing the short circuit rate of the battery as well as increases the specific capacity of the electrode quantity, thus increasing the battery capacity. Furthermore, the electrode material is easier to be drenched by the electrolyte, thus improving the circulation performance of the battery.

Description

Technical field [0001] The invention relates to a battery and a preparation method thereof, and specifically, the invention relates to a laminated lithium ion secondary battery and a preparation method thereof. Background technique [0002] The lithium ion secondary battery refers to an ion battery composed of two compounds that can reversibly insert and extract lithium ions as the positive and negative electrodes. Because of its high specific energy, high operating voltage, wide operating temperature range, low self-discharge rate, long cycle life, no pollution, light weight, and good safety performance, it has a wide range of applications. [0003] Lithium-ion secondary batteries usually include a battery case and an electrode group and electrolyte sealed in the battery case; the electrode group includes a positive electrode, a negative electrode, and a separator between the positive electrode and the negative electrode, and the positive electrode includes a positive electrode ...

Claims

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Application Information

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IPC IPC(8): H01M10/40H01M10/38H01M4/64H01M4/04H01M10/0525H01M10/058
CPCY02E60/10Y02P70/50
Inventor 孙美红荣强何珍
Owner BYD CO LTD
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