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Non-aqueous electrolyte and non-aqoue electrolyte secondary cell

A non-aqueous electrolyte, secondary battery technology, applied in non-aqueous electrolyte batteries, non-aqueous electrolytes, secondary batteries, etc., can solve the problems of long charge-discharge cycle life, unavailability of secondary batteries, etc.

Inactive Publication Date: 2002-10-09
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-aqoue electrolyte secondary cell
  • Non-aqueous electrolyte and non-aqoue electrolyte secondary cell
  • Non-aqueous electrolyte and non-aqoue electrolyte secondary cell

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0201] (Production of positive electrode)

[0202] First, 91% by weight of lithium cobalt oxide (Li x CoO 2 , X satisfies 03 A positive electrode with a positive electrode layer on both sides of the current collector.

[0203] (Production of negative electrode)

[0204] Blended with 93% by weight as a carbon material, mesophase pitch-based carbon fiber powder heat-treated at 3000°C (fiber diameter is 8μm, average fiber length is 20μm, and average interplanar spacing (d 002 ) Is 0.3360 nm) and 7% by weight of polyvinylidene fluoride (PVdF) as a binder to prepare a slurry. The slurry was applied to both sides of a current collector composed of copper foil with a thickness of 12 μm, dried and pressed, and the electrode density was 1.4 g / cm. 3 The negative electrode of the negative electrode layer is carried on both sides of the current collector.

[0205] (Compartment)

[0206] The separator was made of a polyethylene porous film having a thickness of 25 μm, a thermal shrinkage of 20...

Embodiment 2～22

[0217] Except that the composition of the non-aqueous solvent was changed as shown in Table 1 below, the rest was 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)

[0236] Mix ethylene carbonate (EC), propylene carbonate (PC), γ-butyrolactone (BL) and vinylene carbonate in a volume ratio of 25:9:65:1 (EC:PC:BL:VC) (VC), to prepare a non-aqueous solvent. Lithium tetrafluoride borate (LiBF 4 ) Is dissolved in the obtained non-aqueous solvent to a concentration of 1.5 mol / L to obtain a non-aqueous electrolyte.

[0237] (Production of electrode group)

[0238] In the same manner as described in the foregoing Example 1, a flat electrode group was prepared. 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 shell with a thickness of 4 mm, a width of 34 mm, and a height of 58 mm, and the foregoing electrode group was incorporated therein.

[0240] Then, under the same conditions as...

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Abstract

The object of the present invention is to provide a non-aqueous electrolyte, which can suppress gas generation during high-temperature storage, prevent expansion of casing packaging materials, and can also suppress self-discharge under high-temperature environments, and has improved charge-discharge cycle characteristics. The non-aqueous solvent in the non-aqueous electrolyte includes 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 %, When z volume % and p volume %, the aforementioned x, the aforementioned y, the aforementioned z and the aforementioned p respectively satisfy 15≤x≤50, 2≤y≤35, 30≤z≤85, 0

Description

Technical field [0001] The present invention relates to a non-aqueous electrolyte and a non-aqueous electrolyte secondary battery. Background technique [0002] Currently, as non-aqueous electrolyte secondary batteries for portable electrical appliances such as mobile phones, lithium ion secondary batteries have been widely used. 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 is dissolved, and the separator is a porous membrane. The solvent of the aforementioned electrolyte uses a non-aqueous solvent with low viscosity and low boiling point. [0003] For example, Japanese Patent Publication No. Hei 4-14769 describes a mixture of propylene carbonate, ethylene carbonate, and γ-butyrolactone as the main component, and γ-butyrolactone accounts for 10-50 volumes of all solvents. % Of the electrolyte is a non-aqueous electroly...

Claims

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Application Information

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Patent Type & Authority Applications(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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