Search

JP-7857205-B2 - Surface-treated metal plate for batteries

JP7857205B2JP 7857205 B2JP7857205 B2JP 7857205B2JP-7857205-B2

Inventors

  • 河村 道雄
  • 原田 聡子
  • 溝口 沙恵子
  • 堀江 慎一郎
  • 松重 大輔

Assignees

  • 東洋鋼鈑株式会社

Dates

Publication Date
20260512
Application Date
20221012

Claims (6)

  1. A surface-treated metal plate for batteries, Metal substrate and A nickel layer provided on at least one side of the aforementioned metal substrate, A tin layer provided on top of the nickel layer, The nickel-tin alloy layer is formed between the nickel layer and the tin layer , A surface-treated metal plate for batteries, wherein the tin layer satisfies the condition that at least one of the following formulas (1) or (2) is greater than 1. N(220)/N(200) (1) N(220)/N(400) (2) In equations (1) and (2) above, N(220) represents the crystal orientation index of the (220) plane of the tin layer, in equation (1) N(200) represents the crystal orientation index of the (200) plane of the tin layer, and in equation (2) N(400) represents the crystal orientation index of the (400) plane of the tin layer.
  2. The surface-treated metal plate for a battery according to claim 1 , wherein the metal substrate is an iron-based metal substrate.
  3. The surface-treated metal sheet for batteries according to claim 1 or 2, wherein the amount of nickel deposited in the nickel layer is greater than 1.0 g/ m² and less than or equal to 20.0 g/ m² .
  4. The surface-treated metal sheet for batteries according to claim 1 or 2, wherein the amount of tin deposited in the tin layer is 1.0 g/ m² or more and 15.0 g/ m² or less.
  5. A surface-treated metal plate for a battery according to claim 1 or 2, wherein at least one of formula (1) or formula (2) satisfies two or more conditions.
  6. The surface-treated metal plate for batteries according to claim 1 or 2, wherein the nickel-tin alloy layer is such that a diffraction peak is obtained in the diffraction angle range 2θ = 42 to 43° by X-ray diffraction measurement using CuKα as the source as the alloy phase.

Description

This invention relates to a surface-treated metal plate for batteries that exhibits excellent gas generation suppression effects. Among the types of rechargeable batteries that use an alkaline aqueous solution as the electrolyte, so-called alkaline batteries, nickel-cadmium batteries and nickel-metal hydride batteries are widely known and have been put into practical use. Furthermore, among alkaline rechargeable batteries, air batteries and nickel-zinc batteries, which use nickel hydroxide or similar material for the positive electrode, zinc or similar material for the negative electrode active material, and an alkaline aqueous solution as the electrolyte, are also known. One of the challenges to the practical application of zinc-air and nickel-zinc batteries as rechargeable batteries was the problem of hydrogen gas generation during charging and discharging (including natural discharge). If hydrogen gas is generated, and the amount generated becomes excessive, it can lead to a decrease in battery performance, an increase in internal pressure, and potentially battery leakage. These problems are particularly pronounced in batteries where zinc is involved in the battery reaction. It is conventionally known that the hydrogen gas generation problem described above can be solved by applying a material with a high hydrogen overpotential to the negative electrode current collector. For example, Patent Document 1 attempts to solve the hydrogen gas generation problem described above by increasing the hydrogen overpotential by using a copper-tin alloy as the material for the negative electrode current collector. Japanese Patent Application Publication No. 2-75160 Figure 1 is a cross-sectional view of a surface-treated metal plate for a battery according to an embodiment of the present invention.Figure 2 is a cross-sectional view of a surface-treated metal plate for a battery according to another embodiment of the present invention.Figure 3A is an X-ray diffraction (XRD) chart showing the diffraction peaks of the (200) plane in the tin layer.Figure 3B is an X-ray diffraction (XRD) chart showing the diffraction peaks of the (220) plane in the tin layer.Figure 3C is an X-ray diffraction (XRD) chart showing the diffraction peaks of the (400) plane in the tin layer.Figure 4 shows the X-ray diffraction chart of the alloy phase constituting the nickel-tin alloy layer. The surface-treated metal plate for batteries of the present invention is a surface-treated metal plate used in battery applications, for example, as a current collector for the positive or negative electrode, or as a battery container for housing the power generation element of a battery. While not particularly limited, examples of batteries include aqueous batteries using alkaline electrolytes, such as nickel-cadmium batteries, nickel-metal hydride batteries, zinc-air batteries, and nickel-zinc batteries, as well as non-aqueous batteries such as lithium-ion batteries. The surface-treated metal plate for batteries of the present invention is suitably used in aqueous batteries, and is particularly suitable for use as a current collector or battery container in aqueous batteries in which zinc is involved in the battery reaction (e.g., nickel-zinc batteries). Furthermore, the present invention can be applied to either primary or secondary aqueous batteries. The following describes one embodiment of the present invention based on the drawings. Figure 1 is a cross-sectional view of a surface-treated metal plate 10 for a battery according to an embodiment of the present invention. As shown in Figure 1, the surface-treated metal plate 10 for a battery according to this embodiment comprises a nickel layer 30 provided on both sides of a metal substrate 20, and a tin layer 40 provided on top of the nickel layer 30. Furthermore, while Figure 1 illustrates an example in which the nickel layer 30 and tin layer 40 are formed on both sides of the metal substrate 20, in this embodiment, it is sufficient for the nickel layer 30 and tin layer 40 to be formed on at least one side of the metal substrate 20, and it is not particularly limited to the case in which the nickel layer 30 and tin layer 40 are formed on both sides of the metal substrate 20. Also, in this embodiment, the nickel layer 30 and tin layer 40 may be formed on the side where gas generation suppression is required. For example, when the surface-treated metal plate 10 for batteries according to this embodiment is used as a current collector for the positive or negative electrode (for example, as a current collector for the negative electrode of a nickel-zinc battery), or as a lead material or tab material, the nickel layer 30 and tin layer 40 can be formed on both sides of the metal substrate 20. Furthermore, when the surface-treated metal plate 10 for batteries according to this embodiment is used as a battery container, such as a container or electrode can, the nickel layer 30 and tin layer 40 can be formed on