Nonaqueous electrolyte secondary battery and method for manufacturing the same

A non-aqueous electrolyte and secondary battery technology, which is applied in the direction of non-aqueous electrolyte batteries, electrolyte battery manufacturing, non-aqueous electrolyte battery electrodes, etc., to achieve excellent storage characteristics and reduce the initial defective rate.

Inactive Publication Date: 2012-05-16
SANYO ELECTRIC CO LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

In addition, functions such as video replay and game functions of mobile information terminals are increasingly enriched, and power consumption tends to increase further.

Method used

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  • Nonaqueous electrolyte secondary battery and method for manufacturing the same

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0068] Formation of positive electrode active material layer

[0069] Lithium cobaltate, acetylene black as a carbon conductive agent, and PVDF (polyvinylidene fluoride) were mixed at a mass ratio of 95:2.5:2.5, and NMP was used as a solvent for mixing with a mixer to prepare positive electrode mixture slurry.

[0070] The prepared slurry was coated on both sides of an aluminum foil as a positive electrode current collector, dried and then rolled to form a positive electrode active material layer on the positive electrode current collector. In addition, the packing density of the positive electrode active material layer is 3.60 g / cm 3 .

[0071] Porous layer formation

[0072] As the inorganic particles contained in the porous layer, silica particles (SiO 2 , average particle size 40nm, surface area 50cm 2 / g, the trade name "AEROSIL50" manufactured by Aerosil Corporation of Japan, hydrophilic fumed silica). Moreover, the purity of the silica used is 99 mass % or more...

Embodiment 2

[0083] Silica particles (SiO 2 Average particle size: 20nm, surface area 90m 2 / g, the product name "AERO SIL90" manufactured by Japan AEROSIL Co., Ltd., hydrophilic fumed silica), and the aqueous slurry t2 and the battery T2 were produced in the same manner as in Example 1.

Embodiment 3

[0085] Silica particles (SiO 2 Average particle size: 16nm, surface area 130m 2 / g, the product name "AEROSIL30" manufactured by Japan AEROSIL Co., Ltd., hydrophilic fumed silica), and the aqueous slurry t3 and the battery T3 were produced in the same manner as in Example 1.

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Abstract

The present invention relates a nonaqueous electrolyte secondary battery with a porous layer containing inorganic particles formed on a surface of a positive electrode and provides a nonaqueous electrolyte secondary battery capable of reducing the incipient failure and having an excellent shelf life characteristic. The nonaqueous electrolyte secondary battery includes: a positive electrode containing a positive-electrode active material; a negative electrode containing a negative-electrode active material; a nonaqueous electrolyte; and a porous layer provided on a surface of the positive electrode, wherein the porous layer contains silica particles and an aqueous binder.

Description

technical field [0001] The present invention relates to a nonaqueous electrolyte secondary battery in which a porous layer containing inorganic particles is provided on the surface of a positive electrode and a method for manufacturing the same. Background technique [0002] In recent years, the miniaturization and weight reduction of mobile information terminals such as mobile phones, notebook computers, and PDAs (Personal Digital Assistants) have rapidly progressed, and further increases in the capacity of batteries used as driving power sources are required. In addition, functions such as video replay (video replay) and game functions of mobile information terminals are increasingly enriched, and power consumption tends to increase further. Therefore, for a lithium ion secondary battery as a driving power source, high capacity and high performance such as long-time regeneration and output improvement are strongly desired. [0003] Regarding the increase in the capacity o...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H01M4/62H01M4/13H01M10/0525H01M10/058
CPCY02E60/122H01M4/13H01M4/62H01M4/139Y02E60/10Y02P70/50
Inventor 井町直希千贺贵信鉾谷伸宏
Owner SANYO ELECTRIC CO LTD
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