CARBON MATERIAL FOR NON-AQUEOUS ELECTROLYTE SECONDARY BATTERY, NEGATIVE ELECTRODE FOR NON-AQUEOUS ELECTROLYTE SECONDARY BATTERY, NON-AQUEOUS ELECTROLYTE SECONDARY BATTERY, AND MANUFACTURING METHOD FOR CARBON MATERIAL FOR NON-AQUEOUS ELECTROLYTE SECONDARY BATTERY

摘要

An objet of the invention is to provide a non-aqueous electrolyte secondary battery superior in input-output characteristics even at a low temperature. To achieve the object, hybrid particles (carbon material) satisfying certain conditions, and composed of graphite particles and carbon particles with a primary particle size from 3 nm to 500 nm, preferably as well as amorphous carbon, are used as a negative electrode active material for a non-aqueous electrolyte secondary battery, so that the input-output characteristics of a non-aqueous electrolyte secondary battery at a low temperature can be improved remarkably.

主权项

1. A carbon material for a non-aqueous electrolyte secondary battery comprised of hybrid particles comprising graphite particles and carbon fine particles with a primary particle size of 3 nm or more to 500 nm or less, wherein microscopic Raman R values measured for 30 hybrid particles selected at random by a microscopic Raman spectroscopy apparatus give a Raman R(90/10) value expressed by the following formula 2 of 1 or more to 4.3 or less;
Raman R(90/10) value=(Microscopic Raman R value of the particle whose microscopic Raman R value is the (total number of measured particles×0.9)th smallest microscope Raman R value in the case where the microscopic Raman R values are arranged in an ascending order)/(Microscopic Raman R value of the particle whose microscopic Raman R value is the (total number of measured particles×0.1)th smallest microscope Raman R value in the case where the microscopic Raman R values are arranged in an ascending order)  Formula 2.