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Nonaqueous electrolyte secondary battery

A non-aqueous electrolyte, secondary battery technology, applied in non-aqueous electrolyte batteries, non-aqueous electrolyte battery electrodes, secondary batteries, etc., can solve the problems of reduced charge-discharge efficiency, reduced safety, etc., and achieves a reduction in charge-discharge efficiency. The effect of lowering, suppressing rise, and excellent preservation characteristics

Inactive Publication Date: 2008-09-17
SANYO ELECTRIC CO LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Therefore, there are problems of a decrease in charge-discharge efficiency and a decrease in safety after a storage test.

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0075] Lithium cobaltate is used as the positive electrode active material, artificial graphite is used as the negative electrode active material, and the positive electrode and the negative electrode are produced by the above-mentioned method. As lithium cobaltate, lithium cobaltate to which 1 mol% each of Al and Mg and 0.05 mol% of Zr were added was used. In addition, Zr adheres to the surface of lithium cobaltate in the state of particles.

[0076] Set the end-of-charge voltage to 4.40V (as the end-of-charge potential of the positive electrode is 4.50V (vs.Li / Li + )) to design the battery, and design the capacity ratio of the positive electrode to the negative electrode (initial charge capacity of the negative electrode / initial charge capacity of the positive electrode) at this potential to be 1.08. The packing density of the positive electrode was 3.60 g / ml.

[0077] On the surface of the negative electrode, an inorganic particle layer was formed as described above. Vap...

Embodiment 2

[0079] Using acetylene black (manufactured by Denki Kagaku Kogyo Co., Ltd., trade name "HS-100", BET specific surface area is 37m 2 / g, and the average particle diameter is 3.30 μm) as the conductive substance instead of VGCF, the same operation as in Example 1 was carried out to produce a battery. This battery was referred to as battery T2 of the present invention.

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Abstract

To obtain a nonaqueous electrolyte secondary battery which has excellent storage characteristics at elevated temperatures, and can inhibit an increase in battery resistance and a reduction in charge-discharge efficiency after storage, and can enhance safety. A nonaqueous electrolyte secondary battery having a negative electrode including a negative active material, a positive electrode including a positive active material, a nonaqueous electrolyte and a separator placed between the negative electrode and the positive electrode, wherein an inorganic particle layer including an inorganic particle which does not occlude and release lithium, a conductive material and a binder is placed on the surface of the negative electrode, and an electrically conducting path contacting with the surface of the negative electrode is formed in the inorganic particle layer by the conductive material.

Description

technical field [0001] The present invention relates to a nonaqueous electrolyte secondary battery. Background technique [0002] In recent years, as mobile information terminals such as mobile phones, notebook PCs, and PDAs have rapidly become smaller and lighter, higher capacity batteries have been demanded as their driving power sources. Among secondary batteries, the increase in capacity of lithium ion secondary batteries having high energy density is advancing year by year. In addition, there is a tendency for the video playback of these mobile information terminals, the entertainment functions of the game machine to be continuously enriched, and the power consumption to further increase. As for the lithium-ion battery as the driving power source, long-term playback and improved output of the lithium-ion battery are urgently desired. and other high-capacity and high-performance. [0003] So far, the high capacity of lithium-ion secondary batteries has been achieved by...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H01M10/40H01M4/02H01M4/62H01M4/58H01M4/13H01M4/133H01M4/505H01M4/525H01M10/052H01M10/0525H01M10/058H01M10/44
CPCH01M4/13H01M4/624H01M10/0568H01M4/483H01M2004/027H01M4/62H01M4/139H01M10/052H01M10/0565H01M2/1673H01M10/0562Y02E60/122H01M10/44H01M50/46Y02E60/10Y02P70/50H01M10/0561
Inventor 南博之井町直希
Owner SANYO ELECTRIC CO LTD
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