Negative electrodes for secondary battery, copper foil for electrode, secondary battery, and processes for producing negative electrodes for secondary battery

A technology for secondary batteries and manufacturing methods, which is applied in the field of copper foil for negative electrodes and lithium-ion secondary batteries, and can solve the problems of shortened charge-discharge cycle life, low value and smaller secondary batteries, etc.

Inactive Publication Date: 2012-04-18
FURUKAWA ELECTRIC CO LTD +1
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Although the initial charging capacity is large, the rechargeable capacity and the dischargeable capacity will immediately decrease through repeated charge and discharge, resulting in shortened life, and the value as a secondary battery is low.
However, all metal-based anodes including Si have the problem of shortened charge-discharge cycle life.

Method used

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  • Negative electrodes for secondary battery, copper foil for electrode, secondary battery, and processes for producing negative electrodes for secondary battery
  • Negative electrodes for secondary battery, copper foil for electrode, secondary battery, and processes for producing negative electrodes for secondary battery
  • Negative electrodes for secondary battery, copper foil for electrode, secondary battery, and processes for producing negative electrodes for secondary battery

Examples

Experimental program
Comparison scheme
Effect test

no. 1 approach

[0061] The negative electrode for a secondary battery according to the first embodiment is provided in the following configuration: a silicon-based active material containing silicon hydride with a hydrogen content of at least 0.1 atomic% is formed on a current collector substrate using copper foil Envelope. In addition, the negative electrode for a secondary battery according to the first embodiment is used and assembled with other constituent materials such as a positive electrode, a separator, and an electrolyte to form a secondary battery, thereby providing the secondary battery according to the first embodiment.

[0062] First, as the base material (current collector base material) of the current collector used for the negative electrode for the secondary battery of the first embodiment, copper foil can be used. Since the volume of the active material expands or contracts due to the insertion and removal of Li ions during charging and discharging, it is preferable to use a c...

no. 2 approach

[0088] As the base material (current collector base material) of the current collector used for the negative electrode for the secondary battery of the second embodiment, copper foil can be used. Since the volume of the active material expands and contracts due to the insertion and detachment of Li ions during charging and discharging, it is preferable to use copper foil with an elongation of 3% or more, which is a tensile test at a high temperature of 180°C. The elongation at break is more preferably used in the sense that it can follow the expansion and contraction caused by charge and discharge, and the elongation at break is 5% or more. In addition, the tensile strength of the copper foil used for the current collector substrate is preferably in the range of 300 MPa to 1000 MPa (1 GPa).

[0089] In addition, as for the copper foil used for the current collector base material, only the copper foil whose surface is not smooth and does not have gloss, and at least the surface on...

no. 3 approach

[0107] As the base material (current collector base material) of the current collector used for the negative electrode for secondary batteries of the third embodiment, copper foil can be used. Since the volume of the active material expands and contracts due to the insertion and detachment of Li ions during charging and discharging, it is preferable to use copper foil with an elongation of 3% or more, which is a tensile test at a high temperature of 180°C. The elongation at break is more preferably used in the sense that it can follow the expansion and contraction caused by charge and discharge, and the elongation at break is 5% or more. In addition, the tensile strength of the copper foil used for the current collector substrate is preferably in the range of 300 MPa to 1000 MPa (1 GPa).

[0108] In addition, as for the copper foil used for the current collector base material, only the copper foil whose surface is not smooth and does not have gloss, and at least the surface on wh...

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Abstract

Negative electrodes for nonaqueous-electrolyte secondary batteries are provided with which a high capacity is obtained in charge/discharge and the capacity can be inhibited from decreasing even through repeated cycles of charge/discharge. One of the negative electrodes for secondary batteries is obtained by forming a coating film of a silicon-based negative active material on a current collector having a given surface, the coating film having a given thickness and containing silicon hydride having a given hydrogen concentration. Another is obtained by forming a coating film of a silicon-based negative active material on a current collector having a given surface shape by a given method, the coating film having a given surface shape. Still another negative electrode is obtained by forming a coating film of a silicon-based negative active material on a current collector by a given method, the coating film having a given value of the reciprocal of electric double layer capacitance.

Description

Technical field [0001] The present invention relates to a secondary battery, in particular to a lithium ion secondary battery using a non-aqueous solvent electrolyte, a negative electrode used in the secondary battery, a manufacturing method thereof, and a copper foil for a negative electrode. Background technique [0002] In recent years, with the mobility and performance of electronic instruments, secondary batteries as driving power sources are becoming one of the most important components. Especially lithium (Li) ion secondary batteries, because the positive electrode active material and negative electrode active material used in it can obtain high energy density from high voltage, it replaces the existing NiCd battery and Ni-hydrogen battery, and even occupies the secondary battery. Mainstream position. However, by comparing the lithium cobalt oxide (LiCoO) commonly used in current Li-ion batteries 2 )-Based positive electrode active material, and a Li-ion secondary battery...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H01M4/134H01M4/1395H01M4/38H01M4/66H01M4/70H01M10/0569
CPCH01M4/1395Y02E60/122H01M4/66H01M10/0525H01M2004/021H01M4/134Y02E60/10H01M10/0569
Inventor 谷俊夫久保田昌明阿部英俊
Owner FURUKAWA ELECTRIC CO LTD
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