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Separator and non-aqueous electrolyte battery using the separator

A non-aqueous electrolyte and separator technology, applied in non-aqueous electrolyte batteries, secondary batteries, battery electrodes, etc., to achieve the effect of thinning and ensuring battery performance

Inactive Publication Date: 2005-10-05
SANYO ELECTRIC CO LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Therefore, conventional separators have the problem of being unable to achieve thinning while satisfying the insulating function, the electrolyte holding function, and the shutdown function.

Method used

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  • Separator and non-aqueous electrolyte battery using the separator
  • Separator and non-aqueous electrolyte battery using the separator
  • Separator and non-aqueous electrolyte battery using the separator

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1～5

[0118] The thickness of the polyethylene (PE) film as the reinforcement film is 4 μm, and the thickness of the para-oriented aromatic polyamide (PA) film as the heat-resistant film is changed. Batteries were made in the same way. Among them, the thickness of the polyethylene film used as the reinforced film is set to 4 μm. This is because even if the reinforced film is used, it is necessary to study whether it can be supplemented with a heat-resistant film. In addition, in order to ensure the maximum liquid retention, the heat-resistant film The porosity was adjusted so as to be 80% of the maximum value during optimization by the inventors of the present invention.

[0119] The batteries thus produced are hereinafter referred to as batteries A1 to A5 of the present invention, respectively.

Embodiment 1～10

[0132] Same as the best embodiment except that the liquid retention is changed by changing the thickness and porosity of the separator, while changing the thickness of the polyethylene (PE) membrane and the thickness of the polyamide (PA) membrane to make batteries.

[0133] The batteries thus produced are hereinafter referred to as batteries B1 to B10 of the present invention, respectively.

[0134] Here, the porosity of the polyamide film is made close to 80% as the limit value, while on the other hand, considering the mechanical strength (stretchability), the porosity of the polyethylene film is adjusted to be close to the limit value. 60% status. The specific reason for thus limiting the porosity of the polyethylene film to 60% is as follows.

[0135] That is, since tension is applied to the separator when winding up the power generating element, a certain degree of tensile strength is required. In this case, when the porosity is high, it is easy to break, which causes ...

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PUM

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Abstract

A battery separator and a non-aqueous electrolyte battery using the separator are provided that are capable of achieving thickness reduction while fulfilling an insulating function, an electrolyte retention function, and a shutdown function. A battery separator, to be impregnated with a non-aqueous electrolyte and interposed between a positive electrode and a negative electrode, includes a structure of a plurality of layered microporous films, at least one of which includes a reinforcement film made of a polyolefin-based material, and at least one of the rest of which includes a heat-resistance film made of a material having a melting point of 200 DEG C. or higher. The value obtained by multiplying separator thickness (mum) by separator porosity (%) is restricted to 792 mum.% or greater.

Description

technical field [0001] The present invention relates to the improvement of non-aqueous electrolyte batteries such as lithium ion batteries or polymer batteries, and particularly relates to separators which are excellent in heat resistance and can lead to excellent cycle performance in high energy density batteries. Background technique [0002] In recent years, with the rapid development of the size and weight of mobile information terminals such as mobile phones, personal computers, and PDAs, batteries serving as driving power sources have also been required to have higher capacities. Non-aqueous electrolyte batteries, which are charged and discharged by moving lithium ions between the positive and negative electrodes with charge and discharge, have high energy density and high capacity, and are therefore widely used as drive power sources for the above-mentioned mobile information terminals. [0003] Here, with the increase in power consumption due to the multifunctionaliz...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C08J5/22C08J9/00H01M4/02H01M4/36H01M10/05H01M10/0525H01M50/414H01M50/417H01M50/423H01M50/449H01M50/457H01M50/489H01M50/491
CPCH01M2/1653Y02E60/122H01M10/0525Y02T10/7011H01M2/1686Y02E60/10H01M50/449H01M50/417H01M50/457H01M50/414H01M50/491H01M50/489H01M50/423H01M50/46H01M50/463H01M4/131H01M4/525H01M4/133H01M4/587Y02T10/70
Inventor 井町直希吉村精司
Owner SANYO ELECTRIC CO LTD
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