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Current collector, electrode, and non-aqueous electrolyte secondary battery

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., to achieve the effect of increasing resistance and suppressing thermal runaway

Active Publication Date: 2019-09-27
MITSUI CHEM INC
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

This lithium-ion secondary battery has the advantage of high energy density, but on the other hand, since lithium metal and a non-aqueous electrolyte are used, adequate measures for safety are required

Method used

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  • Current collector, electrode, and non-aqueous electrolyte secondary battery
  • Current collector, electrode, and non-aqueous electrolyte secondary battery
  • Current collector, electrode, and non-aqueous electrolyte secondary battery

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0163] Production of PTC layer

[0164] 1. Slurry Preparation

[0165] For slurry preparation, a 5 L planetary mixer was used.

[0166] 900 g of flaky graphite (manufactured by TIMICAL, with an average particle diameter of 2 μm) and 25 g of Super-P (conductive carbon manufactured by TIMCAL) were mixed for 10 minutes, and then 200 g of N-methylpyrrolidone (NMP) was added, and further carried out for 20 minutes. minutes to mix.

[0167] Next, 62.5 g of a mixed liquid (BX1) obtained by dissolving 40 g of a mixture of BMI-1000 / BTA=2 / 1 in 1,000 g of NMP, and 8%-PVDF solution (dissolving PVDFW#7200 manufactured by KUREHA in NMP )62.5g, NMP1000g, kneading for 60 minutes. The solid content concentration at this time was 43% (1000 g of solid content, 1317.5 g of NMP).

[0168] Furthermore, NMP 1000g was added, and kneading was performed for 60 minutes (30% of solid content concentration).

[0169] Then, in order to adjust the viscosity, 682.5 g of NMP was added and mixed for 30 ...

Embodiment 2～24

[0207] It should be noted that in Table 6, the PTC layers shown in PTC2 to 24 were produced in the following manner: according to Example 1, the mixture with the PTC function-imparting component and PVDF (PVDFW#7200 manufactured by KUREHA) were replaced with Except the combination shown in Table 6, it carried out similarly to Example 1, and in Examples 2-24, positive electrodes C-2-24 which arrange|positioned these PTC layers were produced.

Embodiment 25～28

[0209] In addition, in Table 6, the PTC layers shown in PTC-25 to PTC-28 were prepared as follows: According to Example 1, instead of the mixture with the PTC function-imparting component and PVDF (KUREHA PVDFW#7200), The PTC layer was fabricated using a binder liquid obtained by dissolving PVDF-HFP copolymer in NMP.

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Abstract

Provided is a non-aqueous electrolyte secondary battery in which a conductive layer having a PTC function is formed on the surface of a current collector used in the non-aqueous secondary battery, such that the resistance of the conductive layer increases in response to an instantaneous temperature rise in the battery. This current collector is characterized in that the current collector is provided with a conductive substrate, and a conductive layer including a conductive filler and a binding material on at least one surface of the conductive substrate; the binding material includes polyvinylidene fluoride (PVDF) as a binding component, and a PTC function-imparting component; the PTC function-imparting component, when coexisting with a non-aqueous electrolyte, decreases the fusion start temperature and / or the fusion peak temperature of the binding material as measured by differential scanning calorimetry compared to those when only a binding component is used, and therefore, a characteristic in which resistance increases with a rise in temperature is imparted to the conductive layer.

Description

[0001] cross reference [0002] This application claims the priority based on Japanese Patent Application No. 2017-23469 for which it applied in Japan on February 10, 2017, All the content described in this application is incorporated in this specification as it is by reference. In addition, all the contents described in all patents, patent applications, and documents cited in this application are directly incorporated in this specification by reference. technical field [0003] The present invention relates to a collector, an electrode and a nonaqueous electrolyte secondary battery. Background technique [0004] In recent years, lithium-ion secondary batteries have been widely used as power sources for electronic devices such as mobile phones and notebook computers, electric vehicles, and power storage. In particular, recently, demand for batteries with high capacity, high output, and high energy density that can be mounted on hybrid vehicles and electric vehicles has rap...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H01M4/66H01M4/13
CPCY02E60/10H01M4/661H01M4/663H01M4/667H01M4/668H01M10/052H01M10/4235Y02P70/50
Inventor 山本伸司水野悠远藤裕理
Owner MITSUI CHEM INC
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