JP-2026076227-A - Method for producing positive electrode active material particles

JP2026076227AJP 2026076227 AJP2026076227 AJP 2026076227AJP-2026076227-A

Abstract

[Problem] To provide positive electrode active material particles that suppress capacity degradation during charge-discharge cycles. Or, to provide a high-capacity secondary battery. Or, to provide a secondary battery with excellent charge-discharge characteristics. Or, to provide a safe or reliable secondary battery. Or, to provide a novel material, active material particles, or energy storage device. [Solution] A positive electrode active material particle 100 having a first region 101 and a second region 102, the second region having a region in contact with the outside of the first region, the first region having lithium, one or more elements M selected from cobalt, manganese, and nickel, and oxygen, the second region having element M, oxygen, magnesium, and fluorine, the atomic ratio of lithium to element M (Li/M) measured by X-ray photoelectron spectroscopy being 0.5 or more and 0.85 or less, and the atomic ratio of magnesium to element M (Mg/M) measured by X-ray photoelectron spectroscopy being 0.2 or more and 0.5 or less. [Selection Diagram] Figure 1

Inventors

落合輝明
川上貴洋
三上真弓
門馬洋平
鶴田彩恵
高橋正弘

Assignees

株式会社半導体エネルギー研究所

Dates

Publication Date: 20260511
Application Date: 20260120
Priority Date: 20161124

Claims (3)

A method for producing positive electrode active material particles having a first region and a second region, The second region has a region that is in contact with the outside of the first region, The first region comprises lithium, element M, and oxygen. The aforementioned element M is one or more elements selected from cobalt, manganese, and nickel. The second region comprises the element M, oxygen, magnesium, and fluorine. The positive electrode active material particles are formed using a plurality of raw materials, A method for producing positive electrode active material particles in which the ratio (Li/M) of the total number of lithium atoms in the plurality of raw materials to the total number of element M atoms in the plurality of raw materials is greater than 1.02 and less than 1.05.
In claim 1, A method for producing positive electrode active material particles, wherein the number of magnesium atoms in the plurality of raw materials is 0.005 or more and 0.05 or less relative to the total number of element M atoms in the plurality of raw materials.
In claim 1 or claim 2, A method for producing positive electrode active material particles, wherein the number of fluorine atoms in the plurality of raw materials is 0.01 or more and 0.1 or less relative to the total number of element M atoms in the plurality of raw materials.

Description

One aspect of the present invention relates to a product, a method, or a method of manufacture; or to a process, a machine, a manufacture, or a composition of matter; one aspect of the present invention relates to a semiconductor device, a display device, a light-emitting device, a power storage device, a lighting device, an electronic device, or a method of manufacturing the same; or to an electronic device and its operating system. In this specification, the term "energy storage device" refers to all elements and devices that have an energy storage function. For example, this includes rechargeable batteries (also called secondary batteries) such as lithium-ion secondary batteries, lithium-ion capacitors, and electric double-layer capacitors. Furthermore, in this specification, "electronic equipment" refers to all devices that have an energy storage device, and electro-optical devices with an energy storage device, information terminal devices with an energy storage device, etc., are all considered electronic equipment. In recent years, there has been a great deal of development on various energy storage devices, including lithium-ion secondary batteries, lithium-ion capacitors, and air batteries. In particular, high-power, high-capacity lithium-ion secondary batteries have seen a rapid increase in demand, coinciding with the development of the semiconductor industry. They are used in mobile information terminals such as mobile phones, smartphones, and notebook computers, as well as portable music players, digital cameras, medical equipment, and next-generation clean energy vehicles such as hybrid electric vehicles (HEVs), electric vehicles (EVs), and plug-in hybrid electric vehicles (PHEVs). As a source of rechargeable energy, they have become indispensable to today's information society. The characteristics required of lithium-ion secondary batteries include further increases in capacity, improved cycle characteristics, and enhanced safety and long-term reliability in various operating environments. Improvements to the positive electrode active material are being considered to enhance the cycle characteristics and increase the capacity of lithium-ion secondary batteries (Patent Documents 1 and 2). Japanese Patent Publication No. 2012-018914Japanese Patent Publication No. 2016-076454 A diagram illustrating an example of positive electrode active material particles.A diagram illustrating an example of a method for producing positive electrode active material particles.Cross-sectional view of the active material layer when a graphene compound is used as a conductive additive.A diagram illustrating a coin-type rechargeable battery.A diagram illustrating a cylindrical rechargeable battery.A diagram illustrating an example of an energy storage device.A diagram illustrating an example of an energy storage device.A diagram illustrating an example of an energy storage device.A diagram illustrating an example of an energy storage device.A diagram illustrating an example of an energy storage device.A diagram illustrating a laminated rechargeable battery.A diagram illustrating a laminated rechargeable battery.A diagram showing the external appearance of a secondary battery.A diagram showing the external appearance of a secondary battery.A diagram illustrating the method for manufacturing a secondary battery.A diagram illustrating a rechargeable battery that can be bent.A diagram illustrating a rechargeable battery that can be bent.A diagram illustrating an example of an electronic device.A diagram illustrating an example of an electronic device.A diagram illustrating an example of an electronic device.A diagram illustrating an example of an electronic device.SEM observation results.SEM observation results.SEM observation results.Particle size distribution measurement results.Particle size distribution measurement results.XPS measurement results.XPS measurement results.XPS measurement results.A diagram showing a HAADF-STEM image.A diagram showing the energy density maintenance rate of a secondary battery. Embodiments of the present invention will be described in detail below with reference to the drawings. However, it will be readily apparent to those skilled in the art that the present invention is not limited to the following description, and its form and details can be modified in various ways. Furthermore, the present invention is not to be interpreted as being limited to the embodiments described below. Furthermore, while crystal planes and directions are indicated by superscripts in crystallography, in this specification, due to limitations in patent application notation, crystal planes and directions are expressed by placing a minus sign (-) before the number instead of a superscript. Also, individual orientations indicating directions within a crystal are indicated by [ ], collective orientations indicating all equivalent directions are indicated by <>, and individual planes indicating crystal planes are indi