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Copper foil, negative electrode for nonaqueous electrolyte secondary battery, and nonaqueous electrolyte secondary battery

A non-aqueous electrolyte, secondary battery technology, applied in battery electrodes, electrolysis process, electrode carrier/current collector, etc., can solve problems such as difficulty in spreading the electrolyte, thickening of the active material layer, etc., and achieve the effect of excellent cycle characteristics

Active Publication Date: 2018-03-16
FURUKAWA ELECTRIC CO LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

[0006] In addition, when Si, Ge, Sn, etc. are used to increase the capacity of the active material, the active material layer becomes thick, and it may be difficult to spread the electrolyte solution over the entire active material layer.

Method used

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  • Copper foil, negative electrode for nonaqueous electrolyte secondary battery, and nonaqueous electrolyte secondary battery
  • Copper foil, negative electrode for nonaqueous electrolyte secondary battery, and nonaqueous electrolyte secondary battery
  • Copper foil, negative electrode for nonaqueous electrolyte secondary battery, and nonaqueous electrolyte secondary battery

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Embodiment 1～9

[0048] In the copper sulfate electrolytic solution that has added the copper sulfate of the amount shown in table 1, sulfuric acid, chloride ion, ETU namely ethylene thiourea, molybdate, titanate, tellurium oxide, titanium cylinder is set, with following electrolysis condition to electrolysis Copper foil for film production. In addition, the concentrations of Cu, Mo, Ti, and Te in Table 1 are the mass concentrations of each metal element, that is, Cu, Mo, Ti, and Te.

[0049] Electrolysis conditions

[0050] Current density 40~55A / dm 2

[0051] Temperature 45~60℃

[0052] Then, the antirust treatment was given to the electrodeposited copper foil after foil production under the following conditions.

[0053] The electrolytic copper foil after foiling, that is, the untreated copper foil is coated with CrO 3 ; Immerse in 1g / L aqueous solution for 5 seconds, implement chromate treatment, wash with water and dry.

[0054] In addition, although chromate treatment is performed ...

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Abstract

The purpose of the present invention is to provide a copper foil that has excellent cycle properties and is used as a power collector of a negative electrode for a non-aqueous electrolyte secondary cell. The present invention uses a copper foil characterized in that the amount of strain with a load of 300 MPa of stress after one hour of heating at 300°C is 0.2-0.4%. With this copper foil the amount of strain with a load of 300 MPa of stress after one hour of heating at 300°C is preferably 0.2-0.33%. Also, it is preferable for this copper foil to contain 0.005-0.3 mass% of at least one of molybdenum, tellurium, and titanium.

Description

technical field [0001] The present invention relates to a non-aqueous electrolyte secondary battery with a positive electrode, a negative electrode with a negative electrode active material layer formed on the surface of a negative electrode current collector, and a non-aqueous electrolyte, and an electrolytic copper foil, which is particularly suitable for forming a non-aqueous electrolyte. A current collector of the negative electrode for electrolyte secondary batteries. Background technique [0002] In recent years, the development of a new generation of negative electrode active materials having a charge and discharge capacity that greatly exceeds the theoretical capacity of carbon materials as negative electrode active materials for lithium ion secondary batteries has been progressing. For example, materials containing metals capable of alloying with lithium (Li), such as silicon (Si), germanium (Ge), or tin (Sn), are expected. [0003] Especially when Si, Ge, or Sn is...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C25D1/04C22C9/00H01M4/134H01M4/66
CPCC22C9/00C25D1/04C25D3/38H01M4/134H01M4/661Y02E60/10
Inventor 胡木政登篠崎淳篠崎健作藤泽季实子
Owner FURUKAWA ELECTRIC CO LTD
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