SILICON-CONTAINING AMORPHOUS CARBON MATERIAL, METHOD FOR PRODUCING SAME, AND LITHIUM ION SECONDARY BATTERY

• Main Authors: OKAZAKI SEIJI, YAMAGUCHI KOHEI, KATAYAMA MIWA, ODA WATARU, HAMAI KENTA, KAJIURA YUICHI, YAGISHITA YOHEI, HONDA TOMOHIRO, SAKAMOTO AKIO
• Format: Patent
• Language: English; Korean
• Published: 08.07.2016
• Subjects: BASIC ELECTRIC ELEMENTS; ELECTRICITY; PROCESSES OR MEANS, e.g. BATTERIES, FOR THE DIRECT CONVERSIONOF CHEMICAL INTO ELECTRICAL ENERGY

본 발명은, 충방전 시의 부피 변화가 작고, 사이클 특성의 개선이 실용적으로 가능한 리튬이온 이차전지 등의 음극용 재료로서 규소 함유 비정질 탄소재료를 제공한다. 본 발명의 규소 함유 비정질 탄소재료(1)는, 이흑연화 비정질 탄소(4)를 구비하고, 이흑연화 비정질 탄소 중에는 SiO(0＜x＜2)로 이루어진 산화규소 입자가 포함되며, 산화규소 입자의 주위에는 공극(空隙)이 형성된다. 규소 함유 비정질 탄소재료(1) 중 규소의 함유율은 1중량% 이상 50중량% 이하이다. The present invention provides a silicon-containing amorphous carbon material as an anode material of a lithium ion secondary battery or the like of which the improvement of cycling characteristics is practically possible without a change in volume during charging/discharging. The silicon-containing amorphous carbon material (1) is provided with easily graphitized amorphous carbon (4); silicon oxide particles comprising SiOx (0 < x < 2) are contained in the easily graphitized amorphous carbon; and a gap is formed at the periphery of the silicon oxide particles. The silicon content in the silicon-containing amorphous carbon material (1) is 1-50 wt% inclusive.