US 12,218,338 B2 · Electrode, storage battery, power storage device, and electronic device

Abstract

A power storage device with high capacity is provided. A power storage device with high energy density is provided. A highly reliable power storage device is provided. A long-life power storage device is provided. An electrode with high capacity is provided. An electrode with high energy density is provided. A highly reliable electrode is provided. Such a power storage device includes a first electrode and a second electrode. The first electrode includes a first current collector and a first active material layer. The first active material layer includes active material particles, spaces provided on the periphery of the active material particles, graphene, and a binder. The active material particles are silicon. The active material particles and the spaces are surrounded by the graphene and the binder.

Claims11

Dependent claims

A method for manufacturing a negative electrode, the method comprising the steps of:

forming a plurality of silicon particles;
performing a heat treatment on the plurality of silicon particles in an atmosphere containing air to form a silicon oxide film on a surface of each of the plurality of silicon particles;
mixing a graphene compound, a binder, and the plurality of silicon particles after the heat treatment;
performing an etching treatment on the plurality of silicon particles after the heat treatment;
and
forming a slurry after the etching treatment,
wherein part of the silicon oxide film on the surface of each of the plurality of silicon particles is removed by the etching treatment,
wherein the part of the silicon oxide film which is removed by the etching treatment forms a space, and
wherein the heat treatment is performed at a temperature higher than or equal to 700° C. and lower than or equal to 1000° C.

6 more elements

A method for manufacturing a negative electrode, the method comprising the steps of:

forming a plurality of active material particles;
performing a heat treatment on the plurality of active material particles in an atmosphere containing air to form an oxide film on a surface of each of the plurality of active material particles;
mixing a graphene compound, a binder, and the plurality of active material particles after the heat treatment;
performing an etching treatment on the plurality of active material particles after the heat treatment;
and
forming a slurry after the etching treatment,
wherein part of the oxide film on the surface of each of the plurality of active material particles is removed by the etching treatment,
wherein the part of the oxide film which is removed by the etching treatment forms a space,
wherein a thickness of the oxide film is greater than or equal to 100 nm and less than or equal to 900 nm, and
wherein an aqueous solution containing fluorine is used for the etching treatment.

7 more elements

Dependencies are inferred from the claim text.

Electrode, storage battery, power storage device, and electronic device

Life of this patent

Electrode, storage battery, power storage device, and electronic device

Life of this patent

Abstract

Claims11