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Secondary battery and its manufacturing method

A secondary battery, non-aqueous secondary battery technology, applied in secondary battery manufacturing, secondary batteries, battery electrodes, etc., can solve the problems of insufficient high temperature performance, insufficient, waste of time and cost of secondary batteries, etc. Achieve the effect of improving high temperature cycle characteristics and excellent high temperature performance

Inactive Publication Date: 2007-07-18
SONY CORP
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0009] However, when a general-purpose polyethylene-based material is used as a separator, a secondary battery using the material has insufficient high-temperature performance, and such high-temperature performance cannot be evaluated until the secondary battery is completed
Therefore, in the case where the high-temperature performance is evaluated after completion of the secondary battery, and the evaluation result is found to be actually insufficient, various raw materials used in all the processes and the time and cost used in the manufacturing required processes, etc. are wasted
However, there is currently no technology to accurately evaluate separator material properties (i.e., numerically, chemical structures of separator materials) before they are included in secondary batteries.

Method used

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  • Secondary battery and its manufacturing method
  • Secondary battery and its manufacturing method

Examples

Experimental program
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Embodiment

[0060] Next, examples (and comparative examples) of the steps for evaluating the separator according to the present invention will be described. In these embodiments, each secondary battery is in the shape of a coin. However, a secondary battery having other shapes such as a cylindrical shape can also have the same result.

[0061] Various separator materials used in the examples were measured under the conditions described by Condition 1 represented by Pyrolysis+GC / MS. The main measurement procedure is (1) winding the separator on the high temperature foil, (2) placing the high temperature separator in a quartz tube, and placing the quartz tube in a thermal decomposer (produced by Japan Analytical Industry Co., Ltd.). Ltd), (3) thermally decompose the separator by high frequency at 590°C for 12 seconds; and (4) measure the pyrolysate by GC / MS.

[0062] The MS spectrum obtained from the above measurements was analyzed. The relationship between the integrals (areas of the pe...

Embodiment 3

[0069] The cycle characteristics of the secondary batteries of Examples 1, 2 and 3 and Comparative Examples 1 and 2 were evaluated as follows. First, after charging the battery with a constant current of 1 mA at 45°C until the battery voltage reached 4.2 V, the battery was charged at a constant voltage of 4.2 V until the terminal current reached 0.05 mA, and then the battery was discharged at a constant current of 1 mA until the terminal The voltage reaches 2.5V. Under the same charge-discharge conditions, 100 charge-discharge cycles were performed, and in the case where the discharge capacity in the first cycle was 100, the discharge capacity retention ratio (%) in the 100th cycle was measured. The results are shown in FIG. 8 . As shown in FIG. 8 , it was confirmed that in the non-aqueous secondary batteries including the anode, the cathode separator and the non-aqueous electrolyte, in Examples 1, 2 and 3, a high-temperature cycle discharge capacity retention rate of 90% or ...

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Abstract

Provided are a secondary battery comprising a separator material capable of achieving a secondary battery with superior high temperature cycle characteristics and a higher energy density, and a method of manufacturing a secondary battery. A separator is evaluated and selected by thermal decomposition gas chromatography (thermal decomposition+GC / MS). In a suitable separator, the value of (the area of Peak 1 exhibiting 1-Decene) / (the area of Peak 2 exhibiting 1-Octene) in a total ion chromatogram (TIC) of the pyrolysate of the separator is 2.05 or less. More preferably, a material in which the value of (the area of Peak 1) / (the area of Peak 2) is 2.00 or less, the value of (the area of Peak 1) / (the area of Peak 3 exhibiting 1-Nonene) is 1.87 or less, and the value of (the area of Peak 3) / (the area of Peak 2) is 1.05 or less is selected, and is used as a separator.

Description

technical field [0001] The present invention relates to a secondary battery such as a nonaqueous secondary battery including, for example, an anode capable of inserting and extracting lithium, a cathode, a separator provided between the anode and the cathode, and a nonaqueous electrolyte, and a method for preparing the same. Background technique [0002] In recent years, the size and weight of portable electronic devices such as camcorders, cellular phones, and portable laptop computers have been reduced. As a power source suitable for these devices, secondary batteries are often used in particular. [0003] In such portable electronic devices, it is desirable to use a small-sized, lightweight, and large-capacity secondary battery as a power source. Therefore, research to improve the energy density of secondary batteries has been actively pursued. [0004] In recent years, as a battery that can obtain extremely high energy density compared with conv...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): H01M2/16H01M10/40H01M10/04C08J5/22C08J9/00H01M4/38H01M4/40H01M10/05H01M10/052H01M10/39H01M50/403
CPCY02E60/12H01M4/133Y02E60/122H01M10/0436H01M4/405H01M4/587H01M10/052H01M2/0222H01M2/145H01M10/0525H01M4/386H01M4/387Y10T29/49108Y02E60/10H01M50/109H01M50/403Y02P70/50H01M50/489H01M50/417H01M10/05H01M4/134H01M10/42H01M2010/4292
Inventor 稻垣直子明石宽之
Owner SONY CORP
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