Electrode, secondary battery, battery pack, and vehicle
AssigneesKabushiki Kaisha Toshiba, Toshiba Infrastructure Systems & Solutions Corporation
InventorsYasuhiro HARADA, Norio TAKAMI, Takuya IWASAKI, Kazuki ISE, Kazuomi YOSHIMA
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Abstract
According to one embodiment, an electrode is provided. The electrode includes an active material-containing layer which contains an active material. The active material includes a plurality of primary particles containing a niobium-titanium composite oxide. The average value (FUave) of the roughness shape coefficient (FU) according to Formula (1) below is 0.70 or more in 100 primary particles among the plurality of primary particles. [ Formula 1 ] FU = f f c = 4 π a 2 ( 1 )
Claims10
An electrode comprising
- an active material-containing layer which comprises an active material, wherein
- the active material comprises a plurality of primary particles comprising a niobium-titanium composite oxide,
- an average value (FUave) of a roughness shape coefficient (FU) according to Formula (1) below is 0.70 or more in 100 primary particles among the plurality of primary particles, and
- each of the 100 primary particles has a particle size of 0.2 times to 4 times an average particle size (D50) determined from a particle size distribution chart of the plurality of primary particles obtained by a laser diffraction scattering method,
- [
- Formula
-
-
- 1
- ]
-
- FU
- =
- f
- f
- c
- =
- 4
-
- π
-
-
- a
-
- 2
- (
- 1
- )
- where l represents an outer circumference length of a projected cross-section of each of the 100 primary particles, and a represents a cross-sectional area in the projected cross-section of each of the 100 primary particles.
Dependencies are inferred from the claim text.