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Electrode plate for nonaqueous electrolyte secondary battery, and nonaqueous electrolyte secondary battery

A non-aqueous electrolyte, secondary battery technology, applied in non-aqueous electrolyte battery electrodes, battery electrodes, electrode carriers/current collectors, etc., can solve problems such as the reduction of aluminum foil resistance, and achieve the effect of reducing interface resistance

Pending Publication Date: 2022-07-08
SANYO ELECTRIC CO LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Accordingly, Patent Document 1 describes that the resistance of the surface of the aluminum foil is sufficiently reduced.

Method used

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  • Electrode plate for nonaqueous electrolyte secondary battery, and nonaqueous electrolyte secondary battery
  • Electrode plate for nonaqueous electrolyte secondary battery, and nonaqueous electrolyte secondary battery
  • Electrode plate for nonaqueous electrolyte secondary battery, and nonaqueous electrolyte secondary battery

Examples

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Embodiment 1

[0052] [Production of positive plate]

[0053] As the positive electrode active material, LiNi, which is a lithium nickel cobalt manganese composite oxide, was used 0.35 Co 0.35 Mn0.30 O 2 The complex oxide shown. The positive electrode active material, PVDF as a binder, and carbon black were mixed in a mass ratio of 90.3:2.7:7.0, and kneaded while adding N-methyl-2-pyrrolidone to prepare a positive electrode composite material slurry. The molecular weight of PVDF of the composite material layer was set to 1.1 million. In addition, a primer dispersion liquid containing carbon nanotubes as the conductive assistant 6a was applied on both sides of the elongated positive electrode core 5 formed of an aluminum foil with a thickness of 13 μm, and the coating films were dried to obtain a surface formed with a primer. Positive core 5 of layer 6 . At this time, the average diameter of the conductive aid 6a was set to 7.5 nm, and the aspect ratio of the conductive aid 6a was set to...

Embodiment 2

[0058] The basis weight of the primer layer 6 was set to 13 mg / m 2 The positive electrode plate 4 was produced in the same manner as in Example 1, except that the thickness was set to 0.06 μm. The produced positive electrode plate 4 was taken as Example 2.

Embodiment 3

[0060] The positive electrode plate 4 was produced in the same manner as in Example 1, except that the aspect ratio of the conductive aid 6 a used in the primer layer 6 was 8000 and the thickness of the primer layer 6 was 0.08 μm. The produced positive electrode plate 4 was taken as Example 3.

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Abstract

This electrode plate for a nonaqueous electrolyte secondary battery is provided with: an electrode core having an undercoat layer formed on the surface thereof; the electrode composite material layer is formed on the bottom coating layer of the electrode core body, and the bottom coating layer is obtained by coating a bottom coating dispersion liquid on the surface of the electrode core body and drying the bottom coating dispersion liquid. The conductive auxiliary agent used in the undercoat layer is a carbon nanotube, the average diameter of the conductive auxiliary agent is 12 nm or less, the aspect ratio (average length / average diameter) of the conductive auxiliary agent is 4000 or more, and the thickness of the undercoat layer is 0.10 [mu] m or less.

Description

technical field [0001] The present disclosure relates to an electrode plate for a nonaqueous electrolyte secondary battery and a nonaqueous electrolyte secondary battery. Background technique [0002] Patent Document 1 describes a configuration in which, in a lithium ion secondary battery (non-aqueous electrolyte secondary battery), carbon nanofibers are mixed on the surface of an aluminum foil (electrode core) constituting a positive electrode plate as an electrode plate by coating. The slurry prepared in the solvent is dried and then heated to fix the carbon nanofibers on the surface of the aluminum foil. In addition, the average fiber diameter of the carbon nanofibers was 5 to 80 nm, and the average fiber length was 50 to 5000 nm. As a result, it is described in Patent Document 1 that the electrical resistance of the surface of the aluminum foil is sufficiently reduced. [0003] Patent Document 2 describes that in an electrode plate for a non-aqueous electrolyte seconda...

Claims

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Application Information

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IPC IPC(8): H01M4/66
CPCY02E60/10H01M4/364H01M4/623H01M4/625H01M2004/021
Inventor 内屋敷纯也中井晴也
Owner SANYO ELECTRIC CO LTD
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