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Electrode for nonaqueous electrolyte secondary battery

A non-aqueous electrolyte, secondary battery technology, applied in non-aqueous electrolyte battery electrodes, battery electrodes, secondary batteries, etc., can solve the problem of reduced battery energy density, insufficient electrolyte penetration and retention, input/output power characteristics, charging/ Discharge cycle characteristics (decreased cycle durability, etc.)

Pending Publication Date: 2020-05-26
NISSAN MOTOR CO LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, if only the density of the active material in the active material layer is increased, the pores in the active material layer will decrease, and the electrolyte (electrolyte solution) required for charge and discharge reactions may not be able to penetrate sufficiently and remain in the active material layer.
As a result, the following problems sometimes arise: the energy density of the battery decreases, and the input / output power characteristics (high-speed charge / discharge performance) and charge / discharge cycle characteristics (cycle durability) at high battery speeds decrease

Method used

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  • Electrode for nonaqueous electrolyte secondary battery
  • Electrode for nonaqueous electrolyte secondary battery
  • Electrode for nonaqueous electrolyte secondary battery

Examples

Experimental program
Comparison scheme
Effect test

preparation example Construction

[0223] The preparation method of the second electrode active material layer preferably includes the following steps: preparing the second electrode active material layer slurry, and coating the second electrode active material layer slurry on the surface of the prepared first electrode active material layer to form a coating film.

[0224] [Preparation of dispersion liquid]

[0225] When preparing the second electrode active material slurry, first, the second electrode active material and the solvent are mixed. Thus, a dispersion liquid was prepared.

[0226] Here, the specific composition of the second electrode active material is as described above, and thus detailed description thereof will be omitted here.

[0227] The solvent preferably contains the solvent of the electrolytic solution (liquid electrolyte) used in the non-aqueous electrolyte secondary battery constituting the electrode of this embodiment, more preferably the same solvent as the solvent. From this point...

Embodiment 1

[0323]

[0324] LiPF 6 It was dissolved in a mixed solvent of ethylene carbonate (EC) and propylene carbonate (PC) at a ratio of 1 mol / L (volume ratio 1:1) to obtain an electrolytic solution.

[0325]

[0326] Use 100 parts as the positive electrode active material LiNi 0.8 CO 0.15 Al 0.05 o 2 Powder (average particle diameter (primary particle diameter): 6 μm), 6.2 parts of acetylene black [DENKABLACK (registered trademark) manufactured by Denka Corporation] as a conductive additive (average particle diameter (primary particle diameter): 0.036 μm), and 0.4 parts of carbon fiber (Donacarb Milled S-243 manufactured by Osaka Gas Chemical Co., Ltd.: average fiber length 500 μm, average fiber diameter 13 μm: conductivity 200 mS / cm), 31.7 parts of 8 mass % PVdF (weight average molecular weight 380000 ) solution and 61.6 parts of NMP as a solvent were put into a container, and stirred at 2000rmp for 4 minutes to obtain the first positive electrode active material slurry. Th...

Embodiment 2～5、 comparative example 1、2

[0345] The thicknesses of the first positive electrode active material layer, the second positive electrode active material layer, the first negative electrode active material layer, and the second negative electrode active material layer were changed as shown in Table 1 below. Except for this, a nonaqueous electrolyte secondary battery was obtained in the same manner as in Example 1. It should be noted that the thickness of each electrode active material layer was controlled by adjusting the gap of the applicator during coating.

[0346]

[0347] The batteries prepared in Examples and Comparative Examples were fully discharged and then charged, the voltage was checked, and the SOC was adjusted to 50%. Thereafter, discharge was performed at 0.1° C. for 10 seconds. By 0.1C equivalent current value I 0.1C , The voltage change ΔV between the charged voltage and the discharged voltage 0.1C , to measure the DC resistance value. From the above measurement results, the resistan...

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Abstract

The invention is to provide a means that makes it possible to achieve excellent output power characteristics and cycle durability in a nonaqueous electrolyte secondary battery suitable for mounting toa vehicle. An electrode for a nonaqueous electrolyte secondary battery comprises a current collector, a first electrode active material layer arranged on the surface of the current collector and containing a first electrode active material, and a second electrode active material layer arranged on the surface of the first electrode active material layer and containing a second electrode active material; the first electrode active material layer contains a binder in a crystallized state; and the second electrode active material layer contains substantially no binder in a crystallized state.

Description

technical field [0001] The invention relates to an electrode for a nonaqueous electrolyte secondary battery. Background technique [0002] In recent years, environmental and energy problems are expected to be solved through the spread of various electric vehicles. The key to popularization of these electric vehicles is an on-vehicle power supply such as a power supply for electric drive, and the development of a secondary battery has been actively carried out. Electric vehicles need to extend the cruising distance of one charge, and secondary batteries with higher energy density are preferred. [0003] As a means of increasing the energy density of a battery, for example, a method for increasing the density of the active material in the electrode active material layer is mentioned. However, if only the density of the active material in the active material layer is increased, the pores in the active material layer will decrease, and the electrolyte (electrolyte solution) re...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H01M4/13H01M4/62
CPCH01M4/13Y02E60/10H01M4/623H01M4/622H01M10/056H01M4/366H01M4/621H01M2004/021H01M2220/20
Inventor 田中裕行榎健一郎池田吉宏前尾直城矶村省吾
Owner NISSAN MOTOR CO LTD