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Lithium secondary battery

A technology of lithium secondary battery and negative electrode current collector, which is applied in the direction of secondary battery, lithium storage battery, battery electrode, etc. Deformation and shedding suppression effect

Inactive Publication Date: 2012-05-09
SANYO ELECTRIC CO LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Therefore, there is a problem that the negative electrode active material falls off from the negative electrode current collector, and the chargeable and dischargeable capacity decreases with cycles.
On the other hand, when the negative electrode active material is made into a structure that does not fall off from the negative electrode current collector, there is a problem that the negative electrode is deformed such as breaking, wrinkling, and bending due to the stress generated with the volume change of the negative electrode active material, Positive and negative electrodes may be short-circuited due to misalignment of the coiled electrode body, damage to the separator, etc.

Method used

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Examples

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Embodiment 1

[0063] A battery was produced in the same manner as described in the above detailed description.

[0064] The battery produced in this way is hereinafter referred to as battery A1.

Embodiment 2～6

[0066] As the base material of the negative electrode current collector, a Cu-Zr alloy foil is used, and the thickness of the surface layer and the porosity of the surface layer are respectively set as follows: the thickness of the surface layer is 1.3 μm and the porosity of the surface layer is 40%. The thickness of the surface layer is 2.0 μm and the porosity of the surface layer is 33%; the thickness of the surface layer is 2.8 μm and the porosity of the surface layer is 30%; the thickness of the surface layer is 3.5 μm and the porosity of the surface layer is 38 %; A battery was produced in the same manner as in Example 1 above, except that the thickness of the surface layer was 3.9 μm and the porosity of the surface layer was 32%. In addition, the thickness of the surface layer and the porosity of the surface layer can be adjusted by adjusting the plating time, current density, and the like. This also applies to Examples 7, 8, and Comparative Examples 2, 4, 7, and 10 desc...

Embodiment 7

[0069] As the base material of the negative electrode current collector, Cu-Cr-Zr alloy foil is used, and the thickness of the surface layer is set to 2.8 μm, and the porosity of the surface layer is set to 30%. 1 A battery was produced in the same manner.

[0070] The battery produced in this way is hereinafter referred to as battery A7.

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Abstract

The present invention provides a lithium-ion secondary battery using a negative electrode active material capable of alloying with lithium, in which the proof stress and the Vickers hardness of the negative electrode current collector can be adjusted freely, so that deformation of the negative electrode can be inhibited and at the same time the peeling of the negative electrode active material can be inhibited. The lithium secondary battery has a positive electrode, a separator, and a negative electrode. The negative electrode mixture layer contains a negative electrode active material including a metal element capable of alloying with lithium. The negative electrode current collector includes a substrate made of a Cu-Fe-P alloy foil, and a surface layer provided on both surfaces of the substrate and made of pure copper. The surface layer has a Vickers hardness of 120 and less than that of the substrate. The negative electrode current collector has a proof stress of 308 MPa.

Description

technical field [0001] The present invention relates to a lithium ion secondary battery, and more particularly to a cylindrical lithium ion secondary battery using a negative electrode active material alloyed with lithium. Background technique [0002] In recent years, the power consumption of mobile devices such as mobile phones, notebook computers, and personal digital assistants (PDA, Personal Digital Assistant) is rapidly increasing. Along with this, the demand for higher capacity of lithium-ion secondary batteries is increasing. However, it is difficult to sufficiently increase the capacity of a lithium ion secondary battery when using a graphite material which has been widely used conventionally as a negative electrode active material. Therefore, research on negative electrode active materials having a higher capacity than graphite materials is actively being conducted. [0003] Typical examples of new negative electrode active materials currently proposed include ma...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H01M10/0525H01M4/66
CPCH01M2004/027H01M4/661H01M4/667Y02E60/122H01M4/662Y02T10/7011H01M4/0404H01M10/052H01M4/1395H01M4/0435H01M4/134Y02E60/10
Inventor 小林径福井厚史砂野泰三神野丸男
Owner SANYO ELECTRIC CO LTD