NEGATIVE ELECTRODE MATERIAL FOR LITHIUM-ION BATTERIES AND USE THEREFOR

• Main Authors: TAKEUCHI Masataka, OTSUKA Yasunari, PUT Stijn, MUTO Arihiro, ISHII Nobuaki, VAN GENECHTEN Dirk
• Format: Patent
• Language: English; French; German
• Published: 09.05.2018
• Subjects: BASIC ELECTRIC ELEMENTS; CHEMISTRY; COMPOUNDS THEREOF; ELECTRICITY; INORGANIC CHEMISTRY; METALLURGY; NON-METALLIC ELEMENTS; PROCESSES OR MEANS, e.g. BATTERIES, FOR THE DIRECT CONVERSIONOF CHEMICAL INTO ELECTRICAL ENERGY

The negative electrode material of the present invention has a high discharge capacity per unit mass and excellent initial efficiency. By using the negative electrode material, it is possible to provide a high-capacity lithium-ion battery having excellent charge-discharge cycle characteristics. The present invention relates to a negative electrode material for a lithium ion battery, comprising silicon-containing particles, artificial graphite particles and a carbonaceous material, wherein at least part of the silicon-containing particles, the artificial graphite particles and the carbonaceous material form composite particles; wherein the silicon-containing particles are silicon particles having a SiOx (0<x‰¤2) layer on the particle surface, having an oxygen content of 1.0 mass% or more and 18.0 mass% or less, and mainly comprising particles having a primary particle diameter of 200 nm or less; wherein the artificial graphite particles are non-flaky artificial graphite particles and have a 50% particle diameter in a volume-based cumulative particle size distribution, D50, of 1.0 µm or more and 15.0 µm or less; and a lithium-ion battery comprising a negative electrode using the negative electrode material.