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Negative electrode for non-aqueous secondary cell, non-aqueous secondary cell comprising the same, method for producing the same and electronic device comprising non-aqueous secondary cell

A technology for a non-aqueous secondary battery and a manufacturing method, which can be applied to secondary batteries, non-aqueous electrolyte storage batteries, battery electrodes, etc., can solve problems such as poor productivity and reduced production volume.

Active Publication Date: 2004-06-16
MAXELL HLDG LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

In contrast, this problem can be solved by washing the transferred roller and removing the mixture each time, but the throughput per unit time is reduced, so there is a problem of poor productivity.

Method used

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  • Negative electrode for non-aqueous secondary cell, non-aqueous secondary cell comprising the same, method for producing the same and electronic device comprising non-aqueous secondary cell
  • Negative electrode for non-aqueous secondary cell, non-aqueous secondary cell comprising the same, method for producing the same and electronic device comprising non-aqueous secondary cell
  • Negative electrode for non-aqueous secondary cell, non-aqueous secondary cell comprising the same, method for producing the same and electronic device comprising non-aqueous secondary cell

Examples

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Embodiment 1

[0055] As the negative electrode active material, artificial graphite synthesized by the following method was used. That is, 100 parts by mass of coke powder, 40 parts by mass of tar pitch, 14 parts by mass of silicon carbide, and 20 parts by mass of coal tar were mixed in air at 200° C., then pulverized, and then heat-treated at 1000° C. in a nitrogen atmosphere. In the same atmosphere, heat treatment is carried out at 3000°C, and graphitization proceeds to form artificial graphite. The specific surface area of ​​the obtained artificial graphite measured by the BET method is 2.9m 2 / g, the plane spacing d of the crystal (002) plane measured by X-ray diffraction method 002 is 0.3362nm.

[0056] Next, carbon black "CB3050" (trade name) manufactured by Mitsubishi Chemical Corporation was prepared, and the carbon black was adjusted to have a high aspect ratio of 1.0 to 2.5 and a maximum diameter of 1.0 μm or less using a household fruit juice mixer. The adjusted carbon black i...

Embodiment 2

[0058] A negative electrode of Example 2 was prepared in the same manner as in Example 1 except that the amount of carbon black added was 0.05% by mass. The electrode density of the present embodiment is 1.60g / cm 3 .

Embodiment 3

[0060] A negative electrode of Example 3 was produced in the same manner as in Example 1 except that the amount of carbon black added was 0.1% by mass. The electrode density of the present embodiment is 1.59g / cm 3 .

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Abstract

Provided is a negative electrode for a nonaqueous secondary battery with low internal resistance and excellent low temperature property, the nonaqueous secondary battery using the same, a manufacturing method of the negative electrode for the nonaqueous secondary battery with excellent productivity, and an electronic device using the nonaqueous secondary battery. The negative electrode for the nonaqueous secondary battery includes graphite, carbon black, and water-based binder. The carbon black is composed of particles having aspect ratio of not less than 1.0 and not larger than 5.0, and the maximum diameter of 10 [mu]m or less.

Description

technical field [0001] The present invention relates to a negative electrode for a nonaqueous secondary battery, a nonaqueous secondary battery, a method for manufacturing the negative electrode for a nonaqueous secondary battery, and electronic equipment using the nonaqueous secondary battery. Background technique [0002] Non-aqueous secondary batteries represented by lithium-ion secondary batteries are increasing year by year due to their light weight, high voltage, high energy density, and high output, and are installed in state-of-the-art portable electronic devices such as mobile phones and cameras. . Recently, the performance of these electronic devices has also been significantly improved, and accordingly, higher performance requirements have been put forward for non-aqueous secondary batteries mounted on these electronic devices. Higher capacity and higher internal resistance The demand for batteries with excellent discharge characteristics even in a low-temperatur...

Claims

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Application Information

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IPC IPC(8): C01B31/04H01M4/133H01M4/1393H01M4/36H01M4/587H01M4/62H01M10/05
CPCH01M4/587H01M4/625H01M4/364H01M2004/021H01M4/622H01M10/052H01M4/133Y02E60/122Y02E60/10H01M4/139H01M4/58H01M10/0525
Inventor 小山俊洋喜多房次
Owner MAXELL HLDG LTD