Electrode, secondary battery, battery pack, and vehicle
AssigneeKabushiki Kaisha Toshiba
InventorsKazuki ISE, Yasuhiro HARADA, Norio TAKAMI
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Abstract
According to one embodiment, an electrode is provided. An average particle size L1 of the primary particles of the active material and an average particle size L2 of primary particles of the carbon particles satisfy the following formula (1). L1/100≤L2≤L1/10 (1) A covering ratio of the active material by the carbon particles is not less than 80%. The covering ratio is a ratio of a mapping area of the carbon particles to a mapping area of the active material on a mapping image of a section of the active material-containing layer by Raman spectroscopy.
Claims12
An electrode comprising an active material-containing layer containing an active material composite material, and the active material composite material comprising:
- an active material including primary particles;
- and
- carbon particles including primary particles,
- wherein an average particle size L1 of the primary particles of the active material and an average particle size L2 of primary particles of the carbon particles satisfy the following formula (1),
- L1/100≤L2≤L1/10 (1)
- a covering ratio of the active material by the carbon particles is not less than 80%, and
- the covering ratio is a ratio of a mapping area of the carbon particles to a mapping area of the active material on a mapping image of a section of the active material-containing layer by Raman spectroscopy.
Dependencies are inferred from the claim text.