摘要:
According to one embodiment, a negative electrode active material for a non-aqueous electrolyte secondary battery cell includes a composite. The composite includes a carbonaceous material, a silicon oxide dispersed in the carbonaceous material, and a silicon dispersed in the silicon oxide. A half-value width of a diffraction peak of a Si (220) plane in powder X-ray diffraction measurement of the composite is in a range of 1.5° to 8.0°. A mean size of a silicon oxide phase is in a range of 50 nm to 1,000 nm. A value of (a standard deviation)/(the mean size) is equal to or less than 1.0 where the standard deviation of a size distribution of the silicon oxide phase is defined by (d84%−d16%)/2.
摘要:
A negative electrode active material includes complex particles and a carbonaceous material phase which binds the complex particles. The complex particles comprises a metal oxide having an average size of 50 nm to 1 μm and SiOx (0≦x≦0.8) supported on a surface of the metal oxide.
摘要:
There is provided a rechargeable battery evaluation device including: a charging controller configured to switch charging current of a rechargeable battery being charged with first current to second current; and a first state estimator configured to estimate a state of the rechargeable battery based on a feature of change in at least one of a voltage and a charging amount of the rechargeable battery due to switching from the charging current to the second current.