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Non-aqueous electrolyte battery

A non-aqueous electrolyte and battery technology, applied in non-aqueous electrolyte storage batteries, secondary batteries, battery electrodes, etc., can solve problems such as insufficient effect.

Inactive Publication Date: 2006-01-25
SANYO ELECTRIC CO LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0015] In the above configuration, in terms of the suppression of thermal runaway of the battery caused by thermal diffusion through the current collector at a constant voltage, and the suppression of thermal runaway of the active material starting from the precipitation of lithium on the negative electrode such as overcharging, Unable to exert sufficient effect (details will be described later)

Method used

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Examples

Experimental program
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Effect test

Embodiment

[0092] [preliminary experiment]

[0093] For the electron beam crosslinkable separator (used in batteries A1, A4, B1, C1, and D1 of the present invention and comparative batteries U1, V1, W1, and X1 described later), the heat-resistant laminated separator (described later), The battery A2, A5, D2 of the present invention described above and the comparative battery U2, X2), the usual separator (in the battery A3, A6, B2, C2, D3, D4, E, F of the present invention described later and the comparative battery The shutdown (hereinafter, sometimes abbreviated as SD) temperature and membrane rupture (hereinafter, sometimes abbreviated as MD) temperature used in U3, V2, W2, X3, Y, and Z) were studied, and the results are shown in Table 1. In addition, the production method of the evaluation battery cell, the evaluation device, and the measurement method of the SD temperature and the MD temperature are as follows.

[0094] [Evaluation of the production method of the battery cell]

[0...

Embodiment 1

[0108] As Example 1, the battery shown in the best mode for carrying out the invention was used.

[0109] The battery produced in this way is hereinafter referred to as battery A1 of the present invention.

Embodiment 2

[0111] A battery was fabricated in the same manner as in Example 1, except that a heat-resistant laminated separator was used as the separator instead of the electron beam crosslinkable separator.

[0112] The battery produced in this way is hereinafter referred to as battery A2 of the present invention.

[0113] Here, the heat-resistant laminated separator was produced as follows.

[0114] First, polyamide (PA), which is a water-insoluble heat-resistant material, is dissolved in a solution of N-methyl-2-pyrrolidone (NMP) as a water-soluble solvent, and polycondensation is carried out at a low temperature in the solution to produce a polyamide blend. Miscellaneous fluid. Then, after coating this doping solution on one side of a polyethylene (PE) microporous membrane as a base material to a predetermined thickness, it is immersed in water to remove the water-soluble NMP solvent, and Precipitation / coagulation of water-insoluble polyamides. Thus, on one side of the polyethylen...

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Abstract

A non-aqueous electrolyte battery is provided that is capable of improving safety, particularly the tolerance of the battery to overcharging, without compromising conventional battery constructions considerably. A non-aqueous electrolyte battery is furnished with a positive electrode including a positive electrode active material-layer (2) containing a plurality of positive electrode active materials and being formed on a surface of a positive electrode current collector (1), a negative electrode including a negative electrode active material layer (4), and a separator (3) interposed between the electrodes. The positive electrode active material-layer (2) is composed of two layers (2a) and (2b) having different positive electrode active materials, and of the two layers (2a) and (2b), the layer (2b) that is nearer the positive electrode current collector contains, as its main active material, a spinel-type lithium manganese oxide or an olivine-type lithium phosphate compound.

Description

technical field [0001] The present invention relates to improvement of nonaqueous electrolyte batteries such as lithium ion batteries and polymer batteries, and particularly relates to nonaqueous electrolyte batteries excellent in safety during overcharge. Background technique [0002] In recent years, the size and weight of mobile information terminals such as mobile phones, personal computers, and PDAs has rapidly increased, and further increases in capacity have been demanded for batteries serving as driving power sources. Nonaqueous electrolyte batteries, which are charged and discharged by moving lithium ions between the positive and negative electrodes along with charge and discharge, have high energy density and high capacity, and are therefore widely used as driving power sources for mobile information terminals as described above. In addition, its characteristics have been used recently, not only for portable applications such as mobile phones, but also for medium t...

Claims

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Application Information

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IPC IPC(8): H01M10/40H01M10/00H01M4/02H01M4/58H01M4/48H01M4/50H01M4/52H01M10/42H01M50/105H01M50/417
CPCY02E60/122Y02T10/7011H01M10/052H01M4/136H01M4/131Y02E60/10
Inventor 井町直希高野靖男吉村精司藤谷伸
Owner SANYO ELECTRIC CO LTD
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