EP-4738484-A1 - LITHIUM PRIMARY BATTERY

Abstract

A lithium primary battery includes a positive electrode; a negative electrode, and an electrolyte solution. The positive electrode contains at least one selected from the group consisting of manganese dioxide and fluorinated graphite. The negative electrode includes a lithium alloy. The lithium alloy contains magnesium, and the content of the magnesium in the lithium alloy is 10 mass% or less. The electrolyte solution contains a nonaqueous solvent and a solute, and the solute includes a sulfonylimide compound.

Inventors

• NISHITANI, SATOSHI

Assignees

• Panasonic Intellectual Property Management Co., Ltd.

Dates

Publication Date

20260506

Application Date

20240625

Claims (5)

1. A lithium primary battery, comprising: a positive electrode; a negative electrode; and an electrolyte solution, wherein the positive electrode contains at least one selected from the group consisting of manganese dioxide and fluorinated graphite, the negative electrode includes a lithium alloy, the lithium alloy contains magnesium, a content of the magnesium in the lithium alloy is 10 mass% or less, the electrolyte solution contains a nonaqueous solvent and a solute, and the solute includes a sulfonylimide compound.
2. The lithium primary battery according to claim 1, wherein the lithium alloy contains aluminum, and a total content of the magnesium and the aluminum in the lithium alloy is 0.01 mass% or more and 10 mass% or less.
3. The lithium primary battery according to claim 2, wherein a molar ratio of the magnesium to the aluminum in the lithium alloy is 0.05 or more and 13 or less.
4. The lithium primary battery according to claim 1, wherein the sulfonylimide compound includes lithium bis(fluorosulfonyl)imide.
5. The lithium primary battery according to claim 1, wherein a content of the sulfonylimide compound in the electrolyte solution is 0.1 mass% or more and 20 mass% or less.

Description

[Technical Field] The present disclosure relates to a lithium primary battery. [Background Art] Lithium primary batteries have high energy density and low self-discharge, and are therefore used as power sources for many electronic devices. For a positive electrode of lithium primary batteries, manganese dioxide and the like are used. For a negative electrode of lithium primary batteries, for example, lithium metal or lithium alloy in the form of sheet (foil) is used. Patent Literature 1 proposes "a lithium negative electrode for use in a lithium-organic electrolyte battery including an electrolyte containing a lithium salt dissolved therein, and a separator disposed so as to face the negative electrode, in which a lithium body originally laminated with a coating layer of aluminum-magnesium alloy on a surface adjacent to the separator is used as the negative electrode, the lithium negative electrode being configured such that an aluminum-magnesium-lithium ternary alloy is formed by diffusion, to increase the negative electrode surface area and improve the pulse performance of the battery." Patent Literature 2 proposes "a cylindrical electrolyte solution primary battery, comprising: an electrode group having a wound structure in which a positive electrode containing manganese dioxide and a negative electrode are spirally wound with a separator interposed therebetween, wherein the negative electrode has a metal lithium-containing layer constituted only of a single continuous layer on one side of a current collector, 85% or more of the area of a surface of the current collector on which the metal lithium-containing layer is to be formed is covered with the metal lithium-containing layer, and a lithium-aluminum alloy is formed on at least part of a surface opposite to the surface facing the current collector of the metal lithium-containing layer". Patent Literature 3 proposes "a lithium primary battery, comprising: a positive electrode containing iron disulfide as a positive electrode active material; a negative electrode including a lithium alloy as a negative electrode active material; an electrode group wherein the positive electrode and the negative electrode are wound with a separator interposed therebetween; and an electrolyte solution, wherein the lithium alloy contains at least one of magnesium and tin in an amount of 0.02 to 0.2 mol%." Patent Literature 4 proposes "an alkaline metal battery, comprising: a metal packaging material; and a battery cell housed in the metal packaging material, the battery cell including a positive electrode, a negative electrode, and a nonaqueous electrolyte solution containing a nonaqueous solvent and an electrolyte dissolved therein, wherein the electrolyte includes an imide-based alkali metal salt represented by MN(R1SO2)(R2SO2) (where M represents an alkali metal ion, and R1 and R2 each independently represent a fluorine atom or a fluoroalkyl group having 1 to 6 carbon atoms), a cyclic carbonate having an unsaturated bond, and another alkali metal salt containing fluorine, and the metal packaging material contains stainless steel in at least part of a surface that comes in contact with the nonaqueous electrolyte solution". [Citation List] [Patent Literature] Patent Literature 1: Japanese Laid-Open Patent Publication No. S58-209862Patent Literature 2: Japanese Laid-Open Patent Publication No. 2012-138225Patent Literature 3: International Publication WO 2012/066709Patent Literature 4: Japanese Laid-Open Patent Publication No. 2013-125696 [Summary of Invention] [Technical Problem] In a lithium primary battery, during its long-term use, the internal resistance may increase, causing degradation in output characteristics in some cases. [Solution to Problem] One aspect of the present disclosure relates to a lithium primary battery, including: a positive electrode; a negative electrode; and an electrolyte solution, wherein the positive electrode contains at least one selected from the group consisting of manganese dioxide and fluorinated graphite, the negative electrode includes a lithium alloy, the lithium alloy contains magnesium, a content of the magnesium in the lithium alloy is 10 mass% or less, the electrolyte solution contains a nonaqueous solvent and a solute, and the solute includes a sulfonylimide compound. [Advantageous Effects of Invention] According to the present disclosure, it is possible to suppress the degradation in output characteristics of a lithium primary battery during its long-term use. While the novel features of the invention are set forth particularly in the appended claims, the invention, both as to organization and content, will be better understood and appreciated, along with other objects and features thereof, from the following detailed description taken in conjunction with the drawings. [Brief Description of Drawing] [FIG. 1] A front view, partially in sectional, of a lithium primary battery according to an embodiment of the present disclosure. [