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Non-aqueous electrolyte secondary cell

A non-aqueous electrolyte and secondary battery technology, which is applied in the direction of non-aqueous electrolyte batteries, secondary batteries, electrolytes, etc., can solve the problem of not being able to sacrifice battery discharge characteristics, and achieve the effect of improving safety and improving safety

Inactive Publication Date: 2011-08-31
SANYO ELECTRIC CO LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0021] However, in the technologies of the above-mentioned Patent Documents 1 to 7, it is impossible to improve the safety without sacrificing the discharge characteristics of the battery.

Method used

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Examples

Experimental program
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Embodiment 1

[0047]

[0048] When cobalt carbonate is synthesized, 0.15 mol% of zirconium and 0.5 mol% of magnesium are coprecipitated relative to cobalt, and thermal decomposition reaction occurs to obtain tricobalt tetroxide containing zirconium and magnesium. Lithium carbonate as a lithium source was mixed therein and fired at 850°C for 24 hours to obtain lithium cobaltate (LiCoO) containing zirconium and magnesium. 0.9935 Zr 0.0015 Mg 0.005 o 2 ).

[0049] The above-mentioned lithium cobaltate containing zirconium and magnesium, carbon powder as a conductive agent, and polyvinylidene fluoride (PVdF) as a binder are mixed in a mass ratio of 94:3:3, and they are mixed with N-formazan Base-2-pyrrolidone (NMP) was mixed to prepare positive electrode active material slurry.

[0050] Then, using a doctor blade, this positive electrode active material slurry was applied to both surfaces of a positive electrode core made of strip-shaped aluminum foil (thickness 15 μm) with a uniform thic...

Embodiment 2

[0064] In addition to using the above electrolyte, 1,3-dioxane (DOX), adiponitrile, cyclohexylbenzene (CHB) and vinylene carbonate (VC) in a mass ratio of 96.95:0.5:0.05:0.5:2.0 A battery of Example 2 was fabricated in the same manner as in Example 1 above except for the nonaqueous electrolyte.

Embodiment 3

[0066] In addition to using the above electrolyte, 1,3-dioxane (DOX), adiponitrile, tert-amylbenzene (TAB) and vinylene carbonate (VC) in a mass ratio of 93.45:4.0:0.05:0.5:2.0 The battery of Example 3 was fabricated in the same manner as in Example 1 above except for the nonaqueous electrolyte.

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Abstract

The object of the present invention is to provide a non-aqueous electrolyte secondary cell that excels in safety against overcharging and shows only a small increase in thickness during continuous charge. This object can be achieved by adopting the following configuration: a separator is used that is made of a microporous polyolefin membrane having an average pore diameter of 0.07 to 0.09 [mu]m; a non-aqueous electrolyte contains 0.5 to 3.0 mass % of 1,3-dioxane, 0.05 to 0.3 mass % of adiponitrile, and 0.5 to 3.0 mass % of cyclohexylbenzene and / or tert-amylbenzene relative to the mass of the non-aqueous electrolyte; and preferably the non-aqueous electrolyte further contains 0.5 to 5.0 mass % of a vinylene carbonate and 0.1 to 2.0 mass % of 2-propyn-1-yl 2-(methylsulfonyloxy) propionate.

Description

technical field [0001] The invention relates to an improvement of a non-aqueous electrolyte secondary battery. Background technique [0002] In recent years, mobile information terminals such as mobile phones and notebook personal computers have been rapidly advanced in terms of higher functionality, smaller size, and lighter weight. As driving power sources for these terminals, nonaqueous electrolyte secondary batteries typified by lithium ion secondary batteries having high energy density and high capacity are widely used. [0003] Since the non-aqueous electrolyte secondary battery uses a flammable organic solvent, it is necessary to ensure high safety that does not cause smoke or liquid leakage even if the battery is overcharged. [0004] In addition, the organic solvent reacts with the electrodes to generate gas. However, when the gas remains between the positive and negative electrodes, the opposing state of the positive and negative electrodes will deteriorate, hinde...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H01M10/05H01M2/18H01M10/0567H01M4/525H01M50/417
CPCY02E60/12H01M10/4235H01M2300/0037H01M10/0567Y02E60/122H01M4/525H01M2/145H01M4/131H01M2/1653H01M10/0525Y02E60/10H01M50/417H01M50/491
Inventor 宫森启介森本卓弥大下龙司大竹学池田喜彦
Owner SANYO ELECTRIC CO LTD
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