Title:
EVALUATION METHOD OF CATHODE ACTIVE MATERIAL FOR SECONDARY BATTERY
Document Type and Number:
Japanese Patent JP2018147635
Kind Code:
A
Abstract:
PROBLEM TO BE SOLVED: To provide a technique capable of evaluating surely load characteristics due to a performance of a cathode active material.SOLUTION: In the case of acquiring a dQ/dV curve (vertical axis: dQ/dV and horizontal axis: V) determined by differentiation of an electric potential V as a battery voltage with a battery capacity Q in a positive electrode mixture constructed by a cathode active material for a secondary battery, the cathode active material for the secondary battery, evaluates that the cathode active material has an excellent load characteristics when two or more peaks at the dQ/dV curve exist in a charging process, an electric potential difference (width in a horizontal direction at the dQ/dV curve) between the lowest peak of the electric potential and the highest peak of the potential is a reference value a or more, the electric potential difference between each peaks (width in a horizontal direction at the dQ/dV curve) is a reference value b or more, and the electric potential of the peak in which the electric potential is the lowest (width in a horizontal direction at the dQ/dV curve) is a reference value c or less.SELECTED DRAWING: Figure 3
Inventors:
MATSUMOTO SATORU
SUZUKI NAOMI
SUZUKI NAOMI
Application Number:
JP2017039943A
Publication Date:
September 20, 2018
Filing Date:
March 03, 2017
Export Citation:
Assignee:
SUMITOMO METAL MINING CO
International Classes:
H01M4/04; H01M4/139
Attorney, Agent or Firm:
Aniya Setsuo
Fukuoka Masahiro
Fukuoka Masahiro