Anode material for lithium ion secondary battery, anode for lithium ion secondary battery, and lithium ion secondary battery
AssigneeHitachi Chemical Company, Ltd.
InventorsNobushige Nakamura, Yoshito Ishii, Hidetoshi Honbou, Keiji Okabe, Yuriko Ida
Life of this patent
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Abstract
An anode material for a lithium ion secondary battery that includes a carbon material having an average interlayer spacing d002 as determined by X-ray diffraction of from 0.335 nm to 0.340 nm, a volume average particle diameter (50% D) of from 1 μm to 40 μm, a maximum particle diameter Dmax of 74 μm or less, and at least two exothermic peaks within a temperature range of from 300° C. to 1000° C. in a differential thermal analysis in an air stream.
Claims19
An anode material for a lithium ion secondary battery, comprising a carbon material having an average interlayer spacing d002 as determined by X-ray diffraction of from 0.335 nm to 0.338 nm, a volume average particle diameter (50% D) of from 1 μm to 40 μm, a maximum particle diameter Dmax of 74 μm or less, and at least two exothermic peaks that comprise an exothermic peak having a peak within a temperature range of from 300° C. to less than 700° C. and an exothermic peak having a peak within a temperature range of from 700° C. to 745° C.
An anode material for a lithium ion secondary battery comprising:
- a carbon material comprising:
- a first carbon phase that serves as a core;
- a second carbon phase that is present on a surface of the first carbon phase and has a lower crystallinity than the first carbon phase, wherein a content of the second carbon phase is from 0.1° A by mass to 30% by mass with respect to a total mass of the carbon material;
- an average interlayer spacing d002 as determined by X-ray diffraction from 0.335 nm to 0.338 nm;
- a volume average particle diameter (50% D) from 1 μm to 40 μm;
- a maximum particle diameter Dmax of 74 μm or less;
- at least two exothermic peaks that comprise an exothermic peak having a peak within a temperature range of from 300° C. to less than 700° C. and an exothermic peak having a peak within a temperature range of from 700° C. to 745° C.;
- and
- a surface functional group including oxygen within the second carbon phase, wherein an amount of the oxygen relates to the content of the second carbon phase, and the amount of oxygen in terms of an elemental composition of the carbon material is 0.5 to 5 atom %.
Dependencies are inferred from the claim text.