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Non-aqueous electrolyte battery

A non-aqueous electrolyte and battery technology, used in non-aqueous electrolyte storage batteries, electrolyte storage battery manufacturing, secondary batteries, etc., can solve problems such as large capacity deterioration, insufficient stability or cycle characteristics, etc.

Inactive Publication Date: 2007-09-19
SANYO ELECTRIC CO LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, the capacity deterioration during high-temperature storage is large, and manganese dissolves into the electrolyte solution, so there are problems of insufficient stability and cycle characteristics.

Method used

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Examples

Experimental program
Comparison scheme
Effect test

preparation example Construction

[0068] [Preparation of non-aqueous electrolyte solution]

[0069] Mix ethylene carbonate (EC) and diethyl carbonate (DEC) at a volume ratio of 3:7, and dissolve lithium hexafluorophosphate (LiPF 6 ), to prepare a non-aqueous electrolyte.

[0070] [Production of diaphragm]

[0071] First, in acetone as a solvent, 5% by weight of inorganic particles TiO 2 [Rutile type structure, particle size 0.38μm, KR380 manufactured by Titanium Industry Co., Ltd.], relative to TiO 2 It is a copolymer (rubber-like polymer) containing 10% by weight of acrylonitrile structure (unit), and then mixed and dispersed using Filmics manufactured by a special machine to prepare TiO dispersed 2 of slurry. Next, the above-mentioned membrane was coated on both sides of a separator formed of a polyethylene (hereinafter abbreviated as PE) microporous membrane (thickness: 12 μm, porosity measured as described later: 38%) by dip coating method. The slurry is dried and the solvent of the slurry is removed ...

Embodiment 1

[0081] Example 1 uses the battery shown in the foregoing detailed description.

[0082] Hereinafter, the battery thus produced is referred to as battery A1 of the present invention.

Embodiment 2

[0084] A battery was fabricated in the same manner as in Example 1, except that a separator having a film thickness of 18 μm and a porosity of 45% [pore volume: 810 (μm·%)] was used.

[0085] Hereinafter, the battery thus produced is referred to as battery A2 of the present invention.

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Abstract

A battery has a positive electrode active material containing an olivine lithium phosphate-based compound having an elemental composition represented as LiMPO4, where M is a transition metal including at least Fe. The product of a separator thickness x (mum) and a separator porosity y (%) is controlled to be equal to or less than 1500 (mum.%). A porous layer containing inorganic particles and a binder is disposed between the separator and the positive electrode and / or between the separator and the negative electrode.

Description

technical field [0001] The present invention relates to the improvement of non-aqueous electrolyte batteries such as lithium ion batteries and polymer batteries, and particularly relates to batteries that are excellent in cycle characteristics and storage characteristics at high temperatures and can exhibit high reliability even in battery compositions characterized by high output structure. Background technique [0002] In recent years, the miniaturization and weight reduction of mobile information terminals such as mobile phones, notebooks, and PDAs has rapidly progressed, and batteries that serve as driving power sources require higher capacities. Lithium-ion batteries, which are charged and discharged by moving lithium ions between the positive and negative electrodes with charging and discharging, have high energy density and high capacity, and are therefore widely used as driving power sources for mobile information terminals such as those described above. [0003] He...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H01M2/14H01M4/58H01M4/48H01M10/40H01M4/02H01M4/136H01M4/36H01M4/505H01M4/525H01M10/05H01M10/052H01M10/058H01M50/449H01M50/489H01M50/491
CPCH01M10/0525H01M4/364H01M2004/028H01M10/056H01M2/1673H01M2/14H01M4/505H01M4/5825Y02E60/122H01M4/366H01M4/525H01M2/1686Y02E60/10H01M50/46H01M50/449Y02P70/50H01M50/489H01M50/491H01M10/058
Inventor 马场泰宪井町直希贝笃史喜田佳典藤谷伸
Owner SANYO ELECTRIC CO LTD
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