Search

KR-20260067379-A - Secondary batteries and electrical devices

KR20260067379AKR 20260067379 AKR20260067379 AKR 20260067379AKR-20260067379-A

Abstract

The present application provides a secondary battery and an electrical device. The secondary battery comprises an electrolyte and a separator, wherein the separator comprises a base membrane and a coating layer located on at least one side of the base membrane; wherein the secondary battery satisfies 0.5 ≤ G × H / (10 × σ) ≤ 13, where G is the Gurley value of the base membrane, with a unit of s; H is the thickness of the coating layer, with a unit of μm; and σ is the conductivity of the electrolyte at 25°C, with a unit of mS/cm. The secondary battery can be considered to have both safety and fast charging performance.

Inventors

  • 장, 쿠이핑
  • 한, 창롱

Assignees

  • 컨템포러리 엠퍼렉스 테크놀로지 씨오., 리미티드

Dates

Publication Date
20260512
Application Date
20240306
Priority Date
20231114

Claims (14)

  1. In the case of secondary batteries, It comprises an electrolyte and a separator, wherein the separator comprises a base membrane and a coating layer coated on one side of the base membrane; The secondary battery satisfies 0.5 ≤ G × H / (10 × σ) ≤ 13, wherein G is the Gurley value of the base film, with a unit of s; H is the thickness of the coating layer, with a unit of μm; and σ is the conductivity of the electrolyte at 25°C, with a unit of mS/cm.
  2. In paragraph 1, The above secondary battery is characterized by satisfying 0.9≤G×H/(10×σ)≤10.
  3. In paragraph 1, The above secondary battery is a secondary battery characterized by further satisfying 6≤G/σ≤43.
  4. In paragraph 1, A secondary battery characterized in that the Gurley value G of the above-mentioned basement membrane satisfies 100s ≤ G ≤ 300s.
  5. In paragraph 1, A secondary battery characterized in that the thickness H of the coating layer satisfies 0.5μm ≤ H ≤ 5.1μm.
  6. In paragraph 1, A secondary battery characterized in that the conductivity σ of the electrolyte at 25℃ satisfies 7 mS/cm ≤ σ ≤ 15 mS/cm.
  7. In any one of paragraphs 1 through 6, A secondary battery characterized by the porosity of the above-mentioned separator being 30% to 50%.
  8. In any one of paragraphs 1 through 6, A secondary battery characterized in that the above coating layer comprises at least one of an organic coating layer and a ceramic coating layer.
  9. In any one of paragraphs 1 through 6, A secondary battery characterized in that the above-mentioned base membrane comprises one or more of polyethylene, polypropylene, polyimide, polyamide, polyethylene terephthalate, glass fiber, and nonwoven fabric.
  10. In paragraph 8, The above coating layer includes an organic coating layer and a ceramic coating layer; The ceramic coating layer comprises one or more of Al₂O₃ , AlO(OH), SiO₂ , TiO₂ , MgO , CaO, ZnO₂ , ZrO₂ , and SnO₂ ; A secondary battery characterized in that the organic coating layer comprises one or more of polyvinylidene fluoride, vinylidene fluoride-hexafluoropropylene copolymer, styrene-butadiene copolymer, polyacrylic acid, styrene-butadiene rubber, sodium carboxymethylcellulose, polyamide, polyacrylonitrile, polyacrylate, polyacrylate, and sodium hydroxymethylcellulose.
  11. In Paragraph 10, A secondary battery characterized by the coating layer comprising polyvinylidene fluoride accounting for 15% to 100% of the total mass of the coating layer or Al₂O₃ accounting for 55% to 100% of the total mass of the coating layer.
  12. In any one of paragraphs 1 through 6, The above electrolyte comprises a solvent, and the solvent comprises one or more of a carbonate-based solvent, an ether-based solvent, and a linear carboxylate-based solvent; wherein, The above carbonate-based solvent comprises one or more of ethylene carbonate, dimethyl carbonate, propylene carbonate, methyl ethyl carbonate, fluoroethylene carbonate, and diethyl carbonate; The above ether-based solvent comprises one or more of dioxolane, tetrahydrofuran, 2-methyltetrahydrofuran, tetrahydropyran, 1,2-dimethoxyethane, diethyleneglycoldimethyl ether, 1,2-diethoxyethane, and 1,2-dibutoxyethane; A secondary battery characterized in that the above linear carboxylate-based solvent comprises one or more of methyl formate, ethyl formate, methyl propionate, ethyl propionate, propyl propionate, ethyl butyrate, methyl acetate, ethyl acetate, and propyl acetate.
  13. In any one of paragraphs 1 through 6, The above secondary battery is characterized by comprising at least one of a sodium secondary battery and a lithium secondary battery.
  14. In electrical equipment, An electric device characterized by including a secondary battery according to any one of claims 1 to 13.

Description

Secondary batteries and electrical devices The present application claims priority to Chinese patent application No. 202311510581.9, titled “Secondary Battery and Electric Equipment,” filed on November 14, 2023, and said Chinese patent application is incorporated by reference and is merged in its entirety into the present application. This application relates to the field of sodium battery technology, and in particular to secondary batteries and electrical devices. In recent years, secondary batteries have been widely used in various fields, including energy storage power systems such as hydroelectric, thermal, wind, and solar power plants, as well as power tools, electric bicycles, electric motorcycles, electric vehicles, military equipment, and aerospace. As the adoption of secondary batteries spreads, consumers' demands for the safety and fast charging performance of secondary batteries are increasing. Increasing the safety of secondary batteries can affect fast charging performance; for example, while a separator can prevent internal short circuits in the secondary battery by blocking contact between the positive and negative plates and increasing the tensile strength of the separator can improve the safety of the secondary battery, it reduces the ability of active ions such as lithium ions and sodium ions to pass through the separator, thereby decreasing the fast charging performance of the secondary battery. Consequently, it is not possible to consider both the safety and fast charging performance of secondary batteries simultaneously, and thus the application requirements of the new generation electrochemical system are not being met. FIG. 1 is a schematic diagram of a secondary battery of an embodiment of the present application; FIG. 2 is an exploded view of a secondary battery of an embodiment of the present application illustrated in FIG. 1; FIG. 3 is a schematic diagram of a battery module of an embodiment of the present application; FIG. 4 is a schematic diagram of a battery pack of an embodiment of the present application; FIG. 5 is an exploded view of a battery pack of an embodiment of the present application shown in FIG. 4; FIG. 6 is a schematic diagram of an electric device using a secondary battery as a power source according to the embodiment of the present application. Hereinafter, embodiments of the secondary battery and electrical device disclosed in this application will be described in detail with appropriate reference to the drawings. However, unnecessary detailed descriptions may be omitted. For example, detailed descriptions of well-known matters or repetitive descriptions of structures that are actually identical may be omitted. This is to prevent the following description from becoming unnecessarily verbose and to make it easier for those skilled in the art to understand. Furthermore, the drawings and the following description are provided to enable those skilled in the art to fully understand this application and are not intended to limit the subject matter described in the claims. The “ranges” disclosed in this application are limited in the form of lower and upper limits, whereby a given range is defined by selecting one lower limit and one upper limit, and the selected lower and upper limits define the boundaries of a particular range. A range defined in this manner may or may not include end values and may be arbitrarily combined; that is, any lower limit can be combined with any upper limit to form a single range. For example, if ranges of 60-120 and 80-110 are listed for a specific parameter, it means that ranges of 60-110 and 80-120 can also be expected. Furthermore, if the listed minimum range values are 1 and 2, and the listed maximum range values are 3, 4, and 5, all of the following ranges can be expected: 1-3, 1-4, 1-5, 2-3, 2-4, and 2-5. Unless otherwise stated in this application, the numeric range "a-b" is an abbreviation for all combinations of real numbers between a and b, where a and b are both real numbers. For example, the numeric range "0-5" means that all real numbers between "0-5" are already listed in the text, and "0-5" is merely an abbreviation for such combinations of numbers. Furthermore, if a parameter is expressed as an integer ≥ 2, it is equivalent to disclosing that the parameter is, for example, an integer 2, 3, 4, 5, 6, 7, 8, 9, 10, 11, 12, etc. Unless otherwise specified, all embodiments of the present application and selectable embodiments may be combined with each other to form a new technical solution. Unless otherwise specified, all technical features of the present application and selectable technical features can be combined with each other to form a new technical solution. Unless otherwise specified, all steps of the present application may proceed in order or randomly, but are preferably proceeded in order. For example, if the method comprises steps (a) and (b), it means that the method may comprise steps (a) and (b) proceeded in orde