Negative electrode for non-aqueous electrolyte secondary battery, non-aqueous electrolyte secondary battery, and method for producing carbonaceous material for non-aqueous electrolyte secondary battery

• Main Authors: IZAWA, TAKAFUMI, IDE, SAYAKA, KAWAKAMI, TOMOHIRO, OKUNO, TAKETOSHI, IWASAKI, HIDEHARU, CHO, JUN-SANG
• Format: Patent
• Language: Chinese; English
• Published: 01.07.2017
• Subjects: BASIC ELECTRIC ELEMENTS; ELECTRICITY; PROCESSES OR MEANS, e.g. BATTERIES, FOR THE DIRECT CONVERSIONOF CHEMICAL INTO ELECTRICAL ENERGY

The objective of the present invention is to provide a carbonaceous material (carbonaceous material for a non-aqueous electrolyte secondary battery) that is used in the negative electrode of a non-aqueous electrolyte secondary battery (e.g. a lithium ion secondary battery), said carbonaceous material exhibiting good charge/discharge capacity and low resistance and having good resistance to oxidative degradation. The present invention relates to a carbonaceous material for a non-aqueous electrolyte secondary battery, wherein the average interplanar spacing d002 of the (002) plane as calculated using Bragg's equation according to wide-angle X-ray diffraction is in the range of 0.36-0.42 nm, the specific surface area as determined by a nitrogen adsorption BET3 point method is in the range of 20-65 m2/g, the nitrogen element content is 0.3 mass% or less and the oxygen element content is 2.5 mass% or less, and the average particle size according to a laser scattering method is 1-4 [mu]m.