Positive electrode for secondary battery, secondary battery, and method for fabricating positive electrode for secondary battery

Patent metadata

Field	Value
Publication number	US-2016308200-A1
Application number	US-201615193478-A
Country	US
Kind code	A1
Filing date	Jun 27, 2016
Priority date	Aug 27, 2012
Publication date	Oct 20, 2016
Grant date	—

Abstract

A positive electrode for a secondary battery which enables both good battery characteristics and electrode strength at a predetermined level, a secondary battery, and a method for fabricating the positive electrode for a secondary battery are provided. The positive electrode for a secondary battery includes a current collector and an active material layer over the current collector. The active material layer includes an active material, graphene, and a binder. A carbon layer is on a surface of the active material. The proportion of the graphene in the active material layer is greater than or equal to 0.1 wt % and less than or equal to 1.0 wt %.

First claim

What is claimed is:

1 . A positive electrode for a secondary battery comprising:
a current collector; and an active material layer over the current collector, wherein the active material layer comprises an active material, graphene, and a binder, wherein a carbon layer is in contact with a surface of the active material, wherein a proportion of the graphene in the active material layer is greater than or equal to 0.1 wt % and less than or equal to 1.0 wt %, and wherein a maximum value of discharge capacity (mAh/g) of the positive electrode is more than or equal to 140 mAh/g at a discharging rate of 1 C.

Assignees

• Semiconductor Energy Lab

Inventors

• Yamakaji Masaki
• Kawakami Takahiro
• Motoyoshi Mako
• Yatabe Rika

Classifications

• H01M4/587

  for inserting or intercalating light metals · CPC title

• H01M4/505

  of mixed oxides or hydroxides containing manganese for inserting or intercalating light metals, e.g. LiMn2O4 or LiMn2OxFy · CPC title

• H01M4/136

  Electrodes based on inorganic compounds other than oxides or hydroxides, e.g. sulfides, selenides, tellurides, halogenides or LiCoFy · CPC title

• H01M4/043

  involving compressing or compaction · 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