Mixed electrode for nonaqueous electrolyte battery, and manufacturing method for the same

Patent metadata

Field	Value
Publication number	US-2016197339-A1
Application number	US-201314653468-A
Country	US
Kind code	A1
Filing date	Dec 16, 2013
Priority date	Dec 18, 2012
Publication date	Jul 7, 2016
Grant date	—

Abstract

A mixed electrode for a nonaqueous electrolyte battery includes: a first active material; a second active material that reacts with water more easily than the first active material; an organic moisture capture agent; and an organic binder that binds the first active material and the second active material. The organic moisture capture agent is present in the organic binder and the first active material has a smaller specific surface area than the second active material. Thus, the storability of the mixed electrode is improved and when the mixed electrode is applied to the battery, the cycle characteristics of the battery are improved.

First claim

1 . A mixed electrode for a nonaqueous electrolyte battery, comprising:
a first active material; a second active material that reacts with water more easily than the first active material; an organ binder that binds the first active material and the second active material; and 0.001 to 10 parts by mass of an organic moisture capture agent relative to 100 parts by mass of the organic binder, wherein: the organic moisture capture agent is present in the organic binder; and the first active material has a smaller specific surface area than the second active material.

2 . The mixed electrode for a nonaqueous electrolyte battery according to claim 1 , wherein the organic moisture capture agent is an organic acid or a salt thereof with a molecular weight of 46 to 500.

3 . The mixed electrode for a nonaqueous electrolyte battery according to claim 1 , wherein the second active material is a lithium-nickel composite oxide.

4 . The mixed electrode for a nonaqueous electrolyte battery according to claim 1 , wherein the first active material is a lithium-manganese composite oxide.

5 . A manufacturing method for a mixed electrode for a nonaqueous electrolyte battery, comprising:
preparing slurry including at least a first active material, a second active material that reacts with water more easily than the first active material and that has a larger specific surface area than the first active material, an organic binder, a solvent, and 0.001 to 10 parts by mass of an organic moisture capture agent relative to 100 parts by mass of the organic binder; and applying the slurry.

6 . The manufacturing method for a mixed electrode for a nonaqueous electrolyte battery according to claim 5 , wherein the solvent is an organic solvent.

7 . The mixed electrode for a nonaqueous electrolyte battery according to claim 1 , wherein
the first active material is any one of a lithium-manganese composite oxide, a composite oxide with a Ni/Li molar ratio of less than 0.5 among lithium-nickel-cobalt-manganese composite oxide, an olivine lithium composite oxide, or lithium cobaltate, and the second active material is any one of a lithium-nickel composite oxide or a composite oxide with a Ni/Li molar ratio of 0.5 or more among a lithium-nickel-cobalt-manganese composite oxide.

Assignees

• Automotive Energy Supply Corp

Inventors

• Tanjo Yuji
• Tanizaki Hiroaki
• Numata Tatsuji
• Niida Yoshihiro
• Takahashi Yukinori

Classifications

• H01M4/625

  Carbon or graphite · CPC title

• H01M4/1391

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

• H01M4/0404

  by coating on electrode collectors · CPC title

• H01M4/364 Primary

  as mixtures · CPC title

• H01M4/505

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