Copper foil for lithium ion secondary battery negative electrode collector, lithium ion secondary battery negative electrode material, and method for selecting lithium ion secondary battery negative electrode collector

A negative electrode current collector and secondary battery technology, which is applied in the direction of secondary batteries, electrode carriers/current collectors, battery electrodes, etc., can solve the problems of reduced capacity, reduced durability of charge and discharge cycles, and hindrance to electrode reactions, etc., to achieve high Effects of increased energy density and higher capacity

Inactive Publication Date: 2013-07-17
MITSUI MINING & SMELTING CO LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

When the current collector is deformed due to the extension of the current collector due to repeated charge-discharge cycles, etc., a short circuit may occur between the positive electrode and the negative electrode, or the distance between the positive electrode and the negative electrode will change, thereby hindering uniformity. Electrode reaction and can lead to reduced durability of charge-discharge cycles
In addition, if the current collector is broken, the capacity per unit volume will decrease and the battery characteristics of the lithium-ion secondary battery will decrease.

Method used

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  • Copper foil for lithium ion secondary battery negative electrode collector, lithium ion secondary battery negative electrode material, and method for selecting lithium ion secondary battery negative electrode collector
  • Copper foil for lithium ion secondary battery negative electrode collector, lithium ion secondary battery negative electrode material, and method for selecting lithium ion secondary battery negative electrode collector
  • Copper foil for lithium ion secondary battery negative electrode collector, lithium ion secondary battery negative electrode material, and method for selecting lithium ion secondary battery negative electrode collector

Examples

Experimental program
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Effect test

Embodiment 1

[0064]

[0065] Electrodeposited copper foil production process: In Example 1, the electrolytic copper foil 1 was produced by the following process as the copper foil for lithium ion secondary battery negative electrode current collectors. When manufacturing this electrolytic copper foil 1, the known electrolytic copper foil manufacturing apparatus which has a rotating cathode is used. Continuously supply the electrolyte solution with copper ion content of 80g / L, sulfuric acid content of 250g / L, chloride ion content of 2.7ppm, and gelatin content of 2ppm, at a liquid temperature of 50°C and a current density of 60A / dm 2 Electrolysis is carried out under certain conditions, so that copper is deposited on the surface of the rotating cathode. The copper foil plated on the surface of the rotating cathode was peeled off to produce an electrolytic copper foil 1 having a converted thickness of 12 μm (measured thickness: 12 μm). Here, the converted thickness refers to the thickness...

Embodiment 2

[0073] In Example 2, except that an electrolytic copper foil 2 with a converted thickness of 15 μm (measured thickness is 15 μm) was produced in the electrolytic copper foil manufacturing process, the electrolytic copper foil 2 only was produced by the same process as in Example 1. Negative electrode material 2 - 1 provided with a negative electrode mixture layer on one surface, and negative electrode material 2 - 2 provided with negative electrode mixture layers on both surfaces of electrode copper foil 2 . Among them, for the electrolytic copper foil 2 produced in Example 2, the surface roughness (Ra) of the rougher surface was 0.36 μm, and the surface roughness (Ra) of the other surface was 0.32 μm.

Embodiment 3

[0075]In Example 3, except that the electrolytic copper foil 3 with a converted thickness of 17 μm (measured thickness is 18 μm) was produced in the electrolytic copper foil production process, the same process as in Example 1 was used to produce electrolytic copper foil 3 only. Negative electrode material 3 - 1 provided with a negative electrode mixture layer on one surface, and negative electrode material 3 - 2 provided with negative electrode mixture layers on both surfaces of electrode copper foil 3 . Among them, for the electrolytic copper foil 3 produced in Example 3, the surface roughness (Ra) of the one surface with the larger roughness was 0.37 μm, and the surface roughness (Ra) of the other surface was 0.31 μm.

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Abstract

The problem addressed by the present invention is providing a copper foil for a lithium ion secondary battery negative electrode collector that can prevent deformation of the collector even with repetition of a charging and discharging cycle and also providing a lithium ion secondary battery negative electrode material and a method for selecting a lithium ion secondary battery negative electrode collector. To address this problem, the present invention is a copper foil for a lithium ion secondary battery negative electrode collector wherein a copper foil is used. That copper foil is characterized by having a maximum negative load of 30 N or greater in a tension test of a sample in a load-extension curve for tension tests on a 10 mm wide test sample formed from this foil, when O is the origin, EQ the extension, PQ the load, and Q a point on this load-extension curve, with the L value in Equation (1) being in the region of 0.8 or greater. L value = (triangle OQEQ surface area) / (region OQEQ surface area)... (1)

Description

technical field [0001] The invention relates to a copper foil for a negative electrode collector of a lithium ion secondary battery, a negative electrode material for a lithium ion secondary battery, and a selection method for a negative electrode collector of a lithium ion secondary battery, in particular to a method capable of preventing current collection caused by charging and discharging. Copper foil for negative electrode collectors of lithium ion secondary batteries, negative electrode materials for lithium ion secondary batteries, and selection methods for negative electrode collectors of lithium ion secondary batteries. Background technique [0002] Conventionally, there is known a lithium ion secondary battery in which charging and discharging are performed by moving lithium ions between a positive electrode and a negative electrode. Lithium-ion secondary batteries have high capacity, high energy density, and no problems such as memory effects, so they are widely u...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H01M4/66H01M4/134
CPCH01M4/661Y02E60/122H01M10/0525H01M4/13H01M4/04Y02E60/10Y10T29/49108C22C9/00H01M4/134H01M4/66
Inventor 松嵨英明朝长咲子三宅行一
Owner MITSUI MINING & SMELTING CO LTD
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