ULTRA-FINE FIBROUS CARBON FOR NON-AQUEOUS ELECTROLYTE SECONDARY BATTERY, ULTRA-FINE FIBROUS CARBON AGGREGATE, COMPOSITE, AND ELECTRODE ACTIVE MATERIAL LAYER

摘要

The purpose of the present invention is to provide an electrode active material layer exhibiting excellent mechanical strength. This electrode material for a non-aqueous electrolyte secondary battery includes at least an electrode active material, a carbon-based conductive auxiliary agent, and a binder. The carbon-based conductive auxiliary agent has a linear structure, and includes ultra-fine fibrous carbon having an average fibre diameter of more than 200 nm but not more than 900 nm. The electrode material configures an electrode active material layer in which the maximum tensile strength (σ_M) in a planar direction and the tensile strength (σ_T) in an in-plane direction orthogonal to the maximum tensile strength (σ_M) satisfy relational expression (a), namely σ_M/σ_T≤1.6.