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KR-102963895-B1 - Battery and method of manufacturing the same

KR102963895B1KR 102963895 B1KR102963895 B1KR 102963895B1KR-102963895-B1

Abstract

A battery with excellent energy density and cycle characteristics at the beginning of the cycle is provided. A battery (1) according to an embodiment of the present invention comprises a positive electrode (10), a negative electrode (30) that does not have a negative electrode active material, a separator (20) disposed between the positive electrode and the negative electrode, and a carbon layer (41) disposed between the separator (20) and the negative electrode (30), wherein the capacity of the carbon layer (41) is 22% or less of the capacity of the positive electrode (10).

Inventors

  • 이모토, 히로시
  • 오가타, 겐

Assignees

  • 테라와트 테크놀로지 가부시키가이샤

Dates

Publication Date
20260512
Application Date
20200512

Claims (15)

  1. Positive poles and, A cathode that does not have a cathode active material and is composed of at least one material selected from the group consisting of Cu, Ni, Ti, Fe, alloys thereof, and stainless steel (SUS), and A separator disposed between the anode and the cathode, and It has a carbon layer disposed between the separator and the cathode, The discharge capacity of the carbon layer measured by performing 0V CCV charging and 3.0V CC discharge with a current of 0.1C is 22% or less of the discharge capacity of the anode measured by performing 4.2V CC charging and 3.0V CC discharge with a current of 0.1C. battery.
  2. In paragraph 1, A battery having the above-mentioned separator and the above-mentioned carbon layer immersed in an electrolyte.
  3. In paragraph 1 or 2, The above carbon layer is a battery containing a metal capable of forming an alloy with lithium.
  4. In any one of paragraphs 1 to 2, A battery in which the discharge capacity of the carbon layer is 5% or more of the discharge capacity of the anode.
  5. In any one of paragraphs 1 to 2, The above separator is a battery having a separator substrate and a separator coating layer covering one or both sides of the separator substrate.
  6. In any one of paragraphs 1 to 2, The above battery is a lithium secondary battery in which charging and discharging are performed by precipitating lithium metal on the surface of the negative electrode and dissolving the precipitated lithium.
  7. A process of forming a carbon layer on at least one opposing surface of a separator and a cathode arranged facing each other, and The method comprises a process of forming a laminate by overlapping the above-mentioned cathode, the above-mentioned separator, and the above-mentioned anode, and The discharge capacity of the carbon layer measured by performing 0V CCV charging and 3.0V CC discharge with a current of 0.1C is 22% or less of the discharge capacity of the anode measured by performing 4.2V CC charging and 3.0V CC discharge with a current of 0.1C, and The above cathode does not have a cathode active material and is composed of at least one material selected from the group consisting of Cu, Ni, Ti, Fe, alloys thereof, and stainless steel (SUS). Method for manufacturing a battery.
  8. In Paragraph 7, A method for manufacturing a battery, wherein the carbon layer is formed on the separator in the process of forming the carbon layer.
  9. In paragraph 8, The process of forming the carbon layer on the separator is, A process of forming the above carbon layer on a substrate, and A method for manufacturing a battery having a process of transferring the carbon layer described above to the separator.
  10. In Paragraph 9, The process of transferring the carbon layer described above to a separator is, A process of bonding the carbon layer and the separator of the above description through an adhesive layer, and A method for manufacturing a battery having a process for peeling off the above-mentioned material.
  11. In Paragraph 7, A method for manufacturing a battery, wherein the carbon layer is formed on the cathode in the process of forming the carbon layer.
  12. In Paragraph 7, A method for manufacturing a battery, wherein in the process of forming the carbon layer, the carbon layer is formed on the opposing surfaces of both the separator and the negative electrode that are arranged facing each other.
  13. In any one of paragraphs 7 through 12, A method for manufacturing a battery, wherein in the process of forming the carbon layer above, the carbon layer contains a metal capable of forming an alloy with lithium.
  14. In any one of paragraphs 7 through 12, A method for manufacturing a battery, having an additional process of injecting an electrolyte into the laminate after the process of forming the laminate.
  15. In any one of paragraphs 7 through 12, A method for manufacturing a battery, wherein in the process of forming the carbon layer above, the carbon layer has a discharge capacity of 5% or more of the discharge capacity of the anode.

Description

Battery and method of manufacturing the same The present invention relates to a battery and a method for manufacturing the same. Recently, technologies that convert natural energy, such as solar or wind power, into electrical energy have been attracting attention. Accordingly, various batteries are being developed as energy storage devices capable of storing large amounts of electrical energy while also offering high safety. Among these, secondary batteries that perform charging and discharging through the movement of metal ions between the positive and negative electrodes are known to exhibit high voltage and high energy density, with lithium-ion secondary batteries being a representative example. A typical lithium-ion secondary battery involves introducing active materials capable of retaining lithium into the positive and negative electrodes, thereby performing charging and discharging by exchanging lithium ions between the active materials. Additionally, as a secondary battery that does not utilize an active material in the negative electrode, lithium metal secondary batteries are being developed that retain lithium by precipitating lithium metal on the surface of the negative electrode. For example, Patent Document 1 discloses a high energy density, high power lithium metal anode secondary battery having a volume energy density exceeding 1000 Wh/L and/or a mass energy density exceeding 350 Wh/kg when discharged at a rate of at least 1 C at room temperature. Patent Document 1 discloses using an ultra-thin lithium metal anode to realize such a lithium metal anode secondary battery. In addition, Patent Document 2 discloses a lithium secondary battery comprising a positive electrode, a negative electrode, a separator interposed between them, and an electrolyte, wherein the negative electrode has metal particles formed on a negative current collector, which are moved from the positive electrode by charging and form lithium metal on a negative current collector within the negative electrode. Patent Document 2 discloses that such a lithium secondary battery can solve problems caused by the reactivity of lithium metal and problems occurring during the assembly process, and can provide a lithium secondary battery with improved performance and lifespan. FIG. 1 is a schematic diagram of a battery according to a first embodiment. FIG. 2 is a schematic diagram at one point in the charge/discharge cycle of a battery according to the first embodiment. FIG. 3 is a flowchart showing the manufacturing process of a battery according to the first embodiment. FIG. 4 is a cross-sectional view of the manufacturing process of a battery according to the first embodiment. FIG. 5 is a cross-sectional view of the manufacturing process of a battery according to the first embodiment. FIG. 6 is a cross-sectional view of the manufacturing process of a battery according to the first embodiment. FIG. 7 is a cross-sectional view of the manufacturing process of a battery according to the first embodiment. FIG. 8 is a cross-sectional view of the manufacturing process of a battery according to the first embodiment. FIG. 9 is a cross-sectional view of the manufacturing process of a battery according to the first embodiment. FIG. 10 is a cross-sectional view of the manufacturing process of a battery according to a first embodiment. FIG. 11 is a cross-sectional view of the manufacturing process of a battery according to a first embodiment. FIG. 12 is a cross-sectional view of the manufacturing process of a battery according to a first embodiment. FIG. 13 is a schematic diagram of a battery according to a second embodiment. FIG. 14 is a schematic diagram at one point in the charge/discharge cycle of a battery according to the second embodiment. FIG. 15 is a flowchart showing the manufacturing process of a battery according to a second embodiment. FIG. 16 is a cross-sectional view of the manufacturing process of a battery according to a second embodiment. FIG. 17 is a schematic diagram of a battery according to a third embodiment. FIG. 18 is a schematic diagram at one point in the charge/discharge cycle of a battery according to the third embodiment. FIG. 19 is a flowchart showing the manufacturing process of a battery according to a third embodiment. FIG. 20 is a cross-sectional view of the manufacturing process of a battery according to a third embodiment. Embodiments of the present invention (hereinafter referred to as "the present embodiment") will be described in detail below with reference to the drawings as necessary. Additionally, identical elements in the drawings are denoted by the same reference numerals, and redundant descriptions have been omitted. Furthermore, positional relationships such as up, down, left, and right are based on the positional relationships shown in the drawings unless otherwise noted. Moreover, the dimensional ratios in the drawings are not limited to the ratios shown in the drawings. [First embodiment] FIG. 1