Title:
The cathode for nonaqueous system rechargeable batteries, its manufacturing method, and a nonaqueous system rechargeable battery
Document Type and Number:
Japanese Patent JP6124061
Kind Code:
B2
Abstract:
PROBLEM TO BE SOLVED: To suppress foreign substances from being precipitated on a negative electrode even when the negative electrode is driven at a high voltage of 4.3 V or more.SOLUTION: A coat layer containing phosphate or borate that is a salt of phosphoric acid or boric acid and a rare earth element is formed on at least a partial surface of a negative electrode active material particle. The rare earth element has an upper limit potential (equilibrium potential) in a passive region on a potential-pH diagram, the upper limit potential being lower than that of aluminum generally used as a positive electrode collector. Accordingly, in a lithium ion secondary battery using the negative electrode, even when aluminum is eluted due to high voltage charging/discharging, a reaction on the negative electrode is suppressed, so that durability is improved.
Inventors:
Takeshi Maki
Application Number:
JP2013079390A
Publication Date:
May 10, 2017
Filing Date:
April 05, 2013
Export Citation:
Assignee:
KABUSHIKI KAISHA TOYOTA JIDOSHOKKI
International Classes:
H01M4/48; H01M4/13; H01M4/36
Domestic Patent References:
| JP2011192449A | ||||
| JP2002260643A |
Attorney, Agent or Firm:
Patent business corporation Kyoritsu