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Non-aqueous electrolyte and non-aqueous electrolyte secondary cell

A non-aqueous electrolyte and secondary battery technology, applied in the direction of non-aqueous electrolyte batteries, non-aqueous electrolyte, secondary batteries, etc., can solve the problems that secondary batteries cannot be obtained, long charge and discharge cycle life, etc.

Inactive Publication Date: 2005-06-01
KK TOSHIBA
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0010] However, the secondary battery described in Japanese Patent Laid-Open Publication No. Hei 2000-235868 has the problem that a long charge-discharge cycle life cannot be obtained in a high-temperature environment.

Method used

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  • Non-aqueous electrolyte and non-aqueous electrolyte secondary cell
  • Non-aqueous electrolyte and non-aqueous electrolyte secondary cell
  • Non-aqueous electrolyte and non-aqueous electrolyte secondary cell

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0201] (production of positive electrode)

[0202] First, mix 91% by weight lithium cobalt oxide (Li x CoO 2 , x satisfies 03 Both sides of the current collector carry the positive electrode of the positive electrode layer.

[0203] (production of negative electrode)

[0204] Mix 93% by weight of mesophase pitch-based carbon fiber powder (fiber diameter is 8 μm, average fiber length is 20 μm, average interplanar spacing (d 002 ) is 0.3360nm) and 7% by weight of polyvinylidene fluoride (PVdF) as a binder, prepared into a slurry. The aforementioned slurry was coated on both sides of a current collector made of copper foil with a thickness of 12 μm, dried and pressed to obtain an electrode with a density of 1.4 g / cm 3 The current collector is loaded with negative electrode layers on both sides.

[0205] (compartment)

[0206] The separator was made of a polyethylene porous film having a thickness of 25 μm, a thermal shrinkage of 20% at 120° C. for 1 hour, and a porosity of ...

Embodiment 2～22

[0217] Except that the composition of the non-aqueous solvent was changed as shown in the following Table 1, other things were the same as in the foregoing Example 1, and a thin non-aqueous electrolyte secondary battery was produced.

Embodiment 23

[0235] (Preparation of non-aqueous electrolyte solution)

[0236] Mix ethylene carbonate (EC), propylene carbonate (PC), γ-butyrolactone (BL) and vinylene carbonate at a volume ratio of 25:9:65:1 (EC:PC:BL:VC) (VC), prepared a non-aqueous solvent. Lithium tetrafluoroborate (LiBF 4 ) is dissolved in the obtained non-aqueous solvent, so that its concentration is 1.5 mol / liter, to obtain a non-aqueous electrolyte.

[0237] (Production of Electrode Group)

[0238] In the same manner as described in Example 1 above, a flat electrode group was produced. The electrode group was heated and extruded under the same conditions as in Example 1 to integrate the positive electrode, the negative electrode, and the separator.

[0239] An aluminum sheet with a thickness of 300 μm was formed into a rectangular parallelepiped aluminum case with a thickness of 4 mm, a width of 34 mm, and a height of 58 mm, and the aforementioned electrode group was incorporated therein.

[0240] Then, under ...

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Abstract

The object of the present invention is to provide a non-aqueous electrolyte that can suppress gas generation during high-temperature storage, prevent the expansion of the packaging material of the casing, and can also suppress self-discharge in a high-temperature environment, and has improved charge-discharge cycle characteristics. The non-aqueous solvent in the non-aqueous electrolyte comprises ethylene carbonate, propylene carbonate, γ-butyrolactone, and the aforementioned ethylene carbonate, the aforementioned propylene carbonate, and the aforementioned γ-butyrolactone as the fourth component. Solvents other than lactones, corresponding to the aforementioned non-aqueous solvents as a whole, when the proportions of ethylene carbonate, propylene carbonate, γ-butyrolactone and the aforementioned fourth component are respectively recorded as x volume %, y volume %, For z volume % and p volume %, the aforementioned x, the aforementioned y, the aforementioned z, and the aforementioned p satisfy 15≤x≤50, 2≤y≤35, 30≤z≤85, and 0<p≤5, respectively.

Description

technical field [0001] The present invention relates to a nonaqueous electrolyte and a nonaqueous electrolyte secondary battery. Background technique [0002] At present, lithium ion secondary batteries have been widely used as nonaqueous electrolyte secondary batteries for portable electric appliances such as mobile phones. The positive electrode of this battery is lithium cobalt oxide (LiCoO 2 ), the negative electrode is graphite material and carbonaceous, the non-aqueous electrolyte is an organic solvent in which lithium salt has been dissolved, and the interlayer is a porous film. The solvent of aforementioned electrolytic solution adopts the non-aqueous solvent of low viscosity, low boiling point. [0003] For example, Japanese Patent Publication No. 4-14769 describes a mixed solvent composed of propylene carbonate, ethylene carbonate, and γ-butyrolactone as the main body, and γ-butyrolactone accounts for 10 to 50 volumes of all solvents. % electrolyte for non-aqueo...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): H01M4/58H01M4/587H01M6/16H01M10/04H01M10/0525H01M10/0565H01M10/0569H01M10/36H01M50/105H01M50/119H01M50/121H01M50/129H01M50/133
CPCH01M4/587H01M6/164H01M10/0436H01M10/0525H01M10/0565H01M10/0569H01M2300/0037H01M2300/0042Y02E60/10Y02P70/50H01M50/133H01M50/105H01M50/121H01M50/129H01M50/119
Inventor 关野正宏藤原雅史佐藤麻子门马旬小口雅之加藤真琴长谷部裕之
Owner KK TOSHIBA
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