KR-102962594-B1 - NEGATIVE ELECTRODE FOR ALL-SOLID BATTERY AND ALL-SOLID BATTERY COMPRISING THE SAME

KR102962594B1KR 102962594 B1KR102962594 B1KR 102962594B1KR-102962594-B1

Abstract

The present invention comprises a negative electrode current collector; An amorphous carbon layer located on one surface of the above-mentioned cathode current collector; and The present invention relates to a negative electrode for an all-solid-state battery comprising a porous sheet inside the amorphous carbon layer, and an all-solid-state battery comprising the same.

Inventors

염지호
박미희
이현정

Assignees

주식회사 엘지에너지솔루션

Dates

Publication Date: 20260507
Application Date: 20230619

Claims (11)

Cathode current collector; An amorphous carbon layer located on one surface of the above-mentioned cathode current collector; and It includes a porous sheet inside the above amorphous carbon layer; The above porous sheet is in the form of being embedded within an amorphous carbon layer, and Amorphous carbon is located in the pores and on the surface of the above porous sheet, and A negative electrode for an all-solid-state battery, wherein the pores of the above porous sheet are entirely filled with amorphous carbon.
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In paragraph 1, The above porous sheet is a nonwoven fabric, a negative electrode for an all-solid-state battery.
In paragraph 3, The above nonwoven fabric is a negative electrode for an all-solid-state battery, made of polyethylene, polypropylene, or a mixture thereof.
In paragraph 1, A negative electrode for an all-solid-state battery, wherein the porosity of the porous sheet is 70 to 95%.
In paragraph 1, A negative electrode for an all-solid-state battery, wherein the volume ratio of the porous sheet and the amorphous carbon layer is 5:95 to 30:70.
In paragraph 1, The above amorphous carbon layer further comprises a binder, a negative electrode for an all-solid-state battery.
In Paragraph 7, The above amorphous carbon layer comprises 1 to 10 weight percent of a binder based on the total weight of the amorphous carbon layer, for a negative electrode for an all-solid-state battery.
In paragraph 1, A negative electrode for an all-solid-state battery in which a negative active material layer is not formed on the above-mentioned negative current collector.
It comprises an anode; a cathode; and a solid electrolyte layer located between the anode and the cathode, The above-mentioned cathode is a cathode for an all-solid-state battery according to claim 1, and An all-solid-state battery in which the solid electrolyte layer faces the amorphous carbon layer of the cathode.
In Paragraph 10, When charging the above all-solid-state battery, All-solid-state battery in which lithium electrodeposition is performed at the interface between the above-mentioned negative current collector and the amorphous carbon layer.

Description

Negative electrode for all-solid-state battery and all-solid-state battery comprising the same The present invention relates to a negative electrode for an all-solid-state battery and an all-solid-state battery including the same. Reusable lithium-ion batteries, which have high energy density, are attracting attention as a new energy source with eco-friendly characteristics because they can drastically reduce the use of fossil fuels and do not generate by-products from energy use. The above lithium secondary battery is gaining attention as an energy source for high-power and high-energy-density devices, such as electric vehicles, as well as wearable or portable devices. Accordingly, research on lithium secondary batteries with high operating voltage and energy density is becoming more active. In a lithium secondary battery, charging and discharging occur through the process of lithium ions moving between the positive and negative electrodes. Some of the lithium ions that move to the negative electrode attach to the surface of the negative electrode to form lithium nuclei, and these lithium nuclei can grow into lithium dendrites, which are tree-branch-shaped crystals. When lithium dendrites formed and grown on the surface of the negative electrode come into contact with the positive electrode, it can cause a short circuit in the lithium secondary battery, which can shorten the lifespan of the lithium secondary battery and also cause problems in ensuring stable performance. Furthermore, in all-solid-state batteries with high energy density, there is a problem where short circuits frequently occur due to the weak strength of the solid electrolyte membrane placed between the anode and the cathode. It has been proposed to use lithium as a negative electrode active material to increase the energy density of all-solid-state batteries. Methods for using lithium as a negative electrode active material include using lithium or a lithium alloy as the negative electrode active material, or using lithium precipitated at the interface between the negative electrode current collector and the solid electrolyte by charging without forming a negative electrode active material layer on the negative electrode current collector. When lithium is used as the negative electrode active material, lithium is deposited on the negative electrode side during charging, and when a negative electrode active material layer is not formed, lithium is deposited on the negative electrode current collector. As the all-solid-state battery undergoes repeated charging and discharging, the lithium deposited on the negative electrode side in this manner can grow into lithium dendrites through the gaps in the solid electrolyte. These lithium dendrites can cause a short circuit or a decrease in capacity of the battery. In addition, there may be a problem in which cracks occur due to the negative electrode being stressed by the volume expansion of the negative electrode that occurs during the charging and discharging process. Therefore, there is a high need for technology that can prevent the growth of lithium dendrites and solve the problem of cracking. Figure 1 illustrates a negative electrode for an all-solid-state battery according to the present invention. Figure 2 illustrates an all-solid-state battery of the present invention. Figure 3 illustrates the state in which the all-solid-state battery of the present invention is charged. Figure 4 is a graph showing the lifespan characteristics of the all-solid-state battery of Experimental Example 1. The present invention will be described in more detail below. Terms and words used in this specification and claims shall not be interpreted as being limited to their ordinary or dictionary meanings, but shall be interpreted in a meaning and concept consistent with the technical spirit of the invention, based on the principle that the inventor can appropriately define the concept of the terms to best describe his invention. The terms used in this invention are used merely to describe specific embodiments and are not intended to limit the invention. Singular expressions include plural expressions unless the context clearly indicates otherwise. In this invention, terms such as "comprising" or "having" are intended to indicate the existence of the features, numbers, steps, actions, components, parts, or combinations thereof described in the specification, and should be understood as not precluding the existence or addition of one or more other features, numbers, steps, actions, components, parts, or combinations thereof. Negative electrode for all-solid-state batteries The present invention relates to a negative electrode for an all-solid-state battery, wherein the negative electrode for an all-solid-state battery according to the present invention is, Cathode current collector; An amorphous carbon layer located on one surface of the above-mentioned cathode current collector; and A porous sheet may be included