Electrode, manufacturing method thereof, storage battery, and electronic device

Patent metadata

Field	Value
Publication number	US-2017062819-A1
Application number	US-201615247175-A
Country	US
Kind code	A1
Filing date	Aug 25, 2016
Priority date	Aug 27, 2015
Publication date	Mar 2, 2017
Grant date	—

Abstract

As a positive electrode active material of a secondary battery, a lithium-manganese composite oxide containing lithium, manganese, and an element represented by M, and oxygen is used, and the lithium-manganese composite oxide is covered with reduced graphene oxide. An active material layer including the active material, graphene oxide, a conductive additive, and a binder is formed and soaked in alcohol, and then heat treatment is performed, whereby an electrode with reduced graphene oxide is fabricated.

First claim

What is claimed is:

1 . A method for manufacturing an electrode, comprising:
forming an active material layer over a current collector; and performing heat treatment on the active material layer after the active material layer is impregnated with alcohol, wherein the active material layer includes an active material particle covered with a film containing carbon, a conductive additive, graphene oxide, and a binder.

2 . A method for manufacturing an electrode, comprising:
forming an active material layer over a current collector; and performing heat treatment on the active material layer after the active material layer is impregnated with alcohol, wherein the active material layer includes an active material particle covered with a film containing carbon, a conductive additive, graphene oxide, and a binder, and wherein the film containing carbon includes reduced graphene oxide.

3 . The method for manufacturing an electrode, according to claim 1 ,
wherein the active material particle is a lithium-manganese composite oxide represented by Li a Mn b M c O d , and wherein the element M is any one of chromium, cobalt, aluminum, nickel, iron, magnesium, molybdenum, zinc, indium, gallium, copper, titanium, niobium, silicon, and phosphorus.

4 . The method for manufacturing an electrode, according to claim 1 ,
wherein the alcohol is any one of methanol, ethanol, 1-propanol, 2-propanol, 1-butanol, 2-butanol, isobutyl alcohol, and tert-butyl alcohol.

5 . An electrode comprising:
a current collector; and an active material layer over the current collector, wherein the active material layer comprises:
an active material particle;
a conductive additive;
first reduced graphene oxide;
second reduced graphene oxide; and
a binder,
wherein the first reduced graphene oxide is in contact with a first region of the active material particle, and wherein the second reduced graphene oxide is in contact with a second region of the active material particle and includes a region covering at least part of the first reduced graphene oxide.

6 . The electrode according to claim 5 ,
wherein the active material particle is a lithium-manganese composite oxide represented by Li a Mn b M c O d , and wherein the element M is any one of chromium, cobalt, aluminum, nickel, iron, magnesium, molybdenum, zinc, indium, gallium, copper, titanium, niobium, silicon, and phosphorus.

7 . A storage battery comprising:
the electrode according to claim 5 ; and a negative electrode.

8 . An electronic device comprising:
the storage battery according to claim 7 ; and a display panel, an operation key, a speaker, or a microphone.

Assignees

• Semiconductor Energy Lab

Inventors

• Ikenuma Tatsuya

Classifications

• H01M4/1391

  of electrodes based on mixed oxides or hydroxides, or on mixtures of oxides or hydroxides, e.g. LiCoOx · CPC title

• H01M2220/30

  Batteries in portable systems, e.g. mobile phone, laptop · CPC title

• H01M4/366

  as layered products · CPC title

• H01M4/525

  of mixed oxides or hydroxides containing iron, cobalt or nickel for inserting or intercalating light metals, e.g. LiNiO2, LiCoO2 or LiCoOxFy · CPC title

• H01M4/625

  Carbon or graphite · CPC title