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Copper alloy foil and secondary battery cathode

A technology of copper alloy foil and copper alloy, which is applied in the direction of battery electrodes, electrode carriers/collectors, circuits, etc., can solve the problems of reduced charge and discharge capacity of secondary batteries, and achieve the effect of improving heat resistance and adhesion

Inactive Publication Date: 2015-02-11
SH COPPER PROD CO LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Slipping of the negative electrode active material may cause a decrease in the charge and discharge capacity of the secondary battery

Method used

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  • Copper alloy foil and secondary battery cathode
  • Copper alloy foil and secondary battery cathode
  • Copper alloy foil and secondary battery cathode

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0099] In Example 1, oxygen-free copper with a low oxygen content was used as the base material. Then, oxygen-free copper is melted in a nitrogen atmosphere using, for example, a crucible-type melting furnace to prepare a melt. Then, a predetermined amount of zirconium (Zr) was added to the molten oxygen-free copper to melt a copper alloy having a Zr content (Zr concentration) of 0.06% by weight. Then, the melted copper alloy (copper alloy melt) is supplied to a casting mold, and an ingot (ingot) of a predetermined shape is cast. In addition, in this example, the Zr concentration in the copper alloy was measured by analyzing the cast ingot by inductively coupled plasma emission spectroscopy (ICP-AES).

[0100] Next, the ingot is heated to a predetermined temperature and hot-rolled to produce a hot-rolled material with a predetermined thickness. Then, the hot-rolled material is repeatedly subjected to predetermined times of cold-rolling treatment and annealing treatment to a ...

Embodiment 2～10 and comparative example 1～5

[0102] In Examples 2 to 10 and Comparative Examples 1 to 5, the Zr concentration in the copper alloy, the rolling pass schedule, and the total working ratio R of the final cold rolling treatment were set as shown in Table 2 and Table 3, respectively. Moreover, it carried out similarly to the said Example 1, and produced the copper alloy foil. These were respectively made into the samples of Examples 2-10 and Comparative Examples 1-5.

[0103] [Table 2]

[0104]

[0105] [table 3]

[0106]

[0107] About each sample of Examples 1-10 and Comparative Examples 1-5, the evaluation of heat resistance, the evaluation of the peeling energy coefficient E of the copper alloy foil surface, and the evaluation of the secondary battery characteristic were performed.

[0108]

[0109] The evaluation of heat resistance is the evaluation of the softening by heating of each sample of Examples 1-10 and Comparative Examples 1-5. The heat resistance of the copper alloy foil was evaluate...

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Abstract

The invention provides a copper alloy foil and a secondary battery cathode, heat resistance is improved, and adaption with cathode active substances is also improved. The copper alloy foil is formed by a copper alloy having an oxygen-free copper base, the copper alloy includes more than 0.01 mass% and lower than 0.20 mass% Zr, and the remainder is formed by copper and unavoidable impurities. Tensile strength before heating is more than 450 N / mm2, tensile strength after heating from 10 minutes to 3 hours at the temperature below 350 DEG C is more than 400 N / mm2, and stripping energy coefficient E measured by a 2[theta] / [theta] method using X ray diffraction and acted between the surface of the copper alloy foil and a carbon polymer having a chain molecular structure after heating from 10 minutes to 3 hours at the temperature below 350 DEG C is greater than 0.2.

Description

technical field [0001] The present invention relates to a copper alloy foil and a secondary battery negative electrode formed using the copper alloy foil. Background technique [0002] For example, in electronic devices such as mobile phones and notebook personal computers, secondary batteries are often used as power sources. In recent years, miniaturization and weight reduction of such electronic devices are advancing. Therefore, high energy density is required for secondary batteries. Here, the so-called secondary battery is a battery configured in such a way that the chemical reactions of the positive electrode active material and the negative electrode active material of the secondary battery are converted in the form of electric energy through a chemical reaction through the electrolyte (electrolyte solution). Energy is taken out to the outside. Among secondary batteries that are currently put into practical use, a secondary battery having a high energy density is a ...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C22C9/00C22F1/08H01M4/66H01M4/02
CPCH01M4/662C22C9/00C22F1/08Y02E60/10
Inventor 泽井祥束儿玉健二
Owner SH COPPER PROD CO LTD