Nonaqueous electrolyte secondary battery and manufacturing method thereof

A non-aqueous electrolyte and secondary battery technology, applied in the direction of non-aqueous electrolyte batteries, non-aqueous electrolyte battery electrodes, secondary batteries, etc., can solve the problems of insufficient use, achieve buckling suppression, deformation suppression, and excellent cycle characteristics and thermal stability effects

Inactive Publication Date: 2011-06-15
PANASONIC CORP
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  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

[0008] However, in the past, sufficient countermeasures ha

Method used

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  • Nonaqueous electrolyte secondary battery and manufacturing method thereof
  • Nonaqueous electrolyte secondary battery and manufacturing method thereof
  • Nonaqueous electrolyte secondary battery and manufacturing method thereof

Examples

Experimental program
Comparison scheme
Effect test

Embodiment

[0096] (Battery 1)

[0097] (production of positive electrode)

[0098] As the positive electrode active material, LiNi with an average particle size of 10 μm is used 0.82 co 0.15 al 0.03 o 2 . 100 parts by weight of positive active material, 4.5 parts by weight of acetylene black as conductive agent and N-methyl-2-pyrrolidone (NMP) solution of polyvinylidene fluoride (PVDF) as binder (7208 produced by Co., Ltd. ) are mixed to obtain positive electrode mixture slurry. The amount of PVDF added was set at 1.0 parts by weight per 100 parts by weight of the positive electrode active material.

[0099] The obtained positive electrode mixture slurry is coated on both sides of an iron-containing aluminum foil (aluminum alloy foil, A8021H-H18-15RK produced by Nippon Foil Co., Ltd.) with a thickness of 15 μm as the positive electrode collector, dried and rolled, and then A positive electrode plate with a thickness of 0.157 mm was obtained. In the above iron-containing aluminum ...

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Abstract

The invention pertains to a nonaqueous electrolyte secondary battery and to the manufacturing method thereof. Disclosed is a nonaqueous electrolyte secondary battery, which has satisfactory charge/discharge cycle characteristics and satisfactory thermal and dimensional stability following repeated charge/discharge cycles. The nonaqueous electrolyte secondary battery comprises a coiled type electrode group consisting of a long cathode, a long anode and a separator arranged therebetween; a nonaqueous electrolyte; and a square battery case in which the aforementioned components are housed. A horizontal section through the aforementioned electrode group has a long axis and a short axis. The cathode comprises a cathode collector and a cathode active substance layer provided thereon, and the anode comprises an anode collector and an anode active substance layer provided thereon. The tensile strength of the aforementioned cathode when the coefficient of expansion of the cathode in the lengthwise direction is 1% is no more than 15 N/cm.

Description

technical field [0001] The present invention relates to a nonaqueous electrolyte secondary battery and a method for producing the same, and particularly to improvement of an electrode group included in the nonaqueous electrolyte secondary battery. Background technique [0002] In recent years, from the viewpoint of environmental issues, there has been an urgent demand for power supplies for automobiles, or for DC conversion (direct current power supply) of large tools, and there is a need for small and lightweight power supplies that can quickly charge and discharge large currents. secondary battery. As a battery meeting this requirement, a non-aqueous electrolyte secondary battery can be cited, such as a lithium secondary battery in which the negative electrode active material contains metallic lithium, a lithium alloy, or a material (such as a carbon material) capable of intercalating and deintercalating lithium ions (for example, refer to Patent Document 1). Such a nona...

Claims

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Application Information

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IPC IPC(8): H01M10/40H01M4/02H01M4/04H01M4/66H01M10/36
CPCY02E60/122H01M4/661Y02T10/7011H01M10/052H01M4/13H01M2004/021H01M10/0587Y02E60/10Y10T29/49115Y02P70/50H01M4/0471H01M4/139Y02T10/70
Inventor 村冈芳幸冈田行广
Owner PANASONIC CORP
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