Electrode material, paste for electrodes, and lithium ion battery

摘要

An electrode material in which an electrode active material having a carbonaceous film formed on the surface is used, a migration path through which lithium ions diffuse is maintained in the carbonaceous film, and the lithium ion conductivity is also improved while the electron conductivity is supported by the carbonaceous film is provided.;A electrode material, wherein the electrode material have a particulate shape, the electrode material is formed a carbonaceous film on surfaces of electrode active material particles, a coating proportion of the surfaces of the electrode active material particles by the carbonaceous film is 80% or more, and an apparent density (ρV) of the carbonaceous film calculated from an amount of carbon in the electrode material, a specific surface area of the electrode material, and an average film thickness of the carbonaceous film is in a range of 0.10 g/cm3 to 1.08 g/cm3.

主权项

1. An electrode material, comprising:
electrode active material particles and a carbonaceous film provided on surfaces of the electrode active material particles, wherein the electrode active material particles having the carbonaceous film provided thereon form an electrode material having a particulate shape; wherein a proportion of the surfaces of the electrode active material particles coated by the carbonaceous film is 80% or more; and wherein an apparent density ρV of the carbonaceous film is in a range of 0.10 g/cm3 to 1.08 g/cm3, wherein the apparent density ρV of the carbonaceous film is calculated from an amount of carbon in the electrode material, a specific surface area of the electrode material, an average film thickness of the carbonaceous film, a proportion of a carbon component in a total mass of the electrode material is in a range of 0.6% by mass to 5.0% by mass, a true density ρT if the carbonaceous film obtained using a gas-phase substitution method is in a range of 1.80 g/cm3 to 2.50 g/cm3, and a ratio ρV/ρT of the apparent density ρV of the carbonaceous file to the true density of the carbonaceous film is in a range of 0.04 to 0.60.