Electrode active materialand lithium secondary battery

Abstract

Electrode active material that is used together with an electrolyte solution having an electrolyte decomposition potential Ve is represented by the general expression LixFeMyO2 and is amorphous. In the expression, x and y are values which independently satisfy 1 < x = 2.5 and O < y = 3, respectively, and z = (x + (valence of Fe) + (valence of M) x y) / 2 to satisfy stoichiometry, and M representsone or two or more types of glass former element. The average electronegativity of M is less than (Ve + 6.74 / 5.41.

Description

technical field

[0001] The invention relates to an amorphous electrode active material with excellent charging and discharging characteristics, and a lithium secondary battery using the amorphous electrode active material. Background technique

[0002] With the miniaturization of personal computers, video cameras, mobile phones and other such devices, lithium secondary batteries have been widely used as power sources in the fields of communication devices and information-related devices due to their high energy density. Furthermore, in the field of motor vehicles, rapid development of electric vehicles is also urgently required due to environmental and resource issues, and lithium secondary batteries are being considered as power sources for driving these electric vehicles.

[0003] It is currently known to use amorphous electrode active materials as electrode active materials for lithium secondary batteries. For example, Japanese Patent Application Publication No. 2005-135...

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