材料科学
陶瓷
阳极
微观结构
分散性
化学工程
碳纤维
锂(药物)
退火(玻璃)
离子
复合材料
纳米技术
电极
复合数
有机化学
高分子化学
内分泌学
工程类
物理化学
化学
医学
作者
Ying Zeng,Zhiyan He,Mingqi Li
出处
期刊:Nanotechnology
[IOP Publishing]
日期:2021-02-19
卷期号:32 (19): 190002-190002
被引量:3
标识
DOI:10.1088/1361-6528/abe075
摘要
SiOC ceramic material is a promising anode material for lithium-ion batteries. However, due to its intrinsically low electronic conductivity, it often suffers from a much lower specific capacity than the theoretical value, poor rate capability and serious potential hysteresis. In this paper, we report a core-shell structured monodisperse carbon-rich SiO1.31C1.46H0.81 submicron ceramic sphere with a free carbon content of 13.7 wt%, which is synthesized by directly annealing polysiloxane spheres derived from vinyltrimethoxysilane without adding external carbon resources. The SiO1.31C1.46H0.81 sphere has a unique microstructure, the core of which is organically assembled by large amounts of SiO1.31C1.46H0.81 primary particles of less than 20 nm and coated by a shell of 20-50 nm. As anodes for lithium-ion batteries, it presents much higher reversible capacity, initial Coulomb efficiency (ICE) and rate performance than the SiOC-based ceramic materials reported in the literature to date. At 100 mA g-1, its first reversible capacity and ICE reach ∼1107 mAh g-1 and 78.2%, respectively. At 1600 mA g-1, its stable discharge capacity is still as high as 610 mAh g-1. The excellent electrochemical performance is attributed to the moderate composition, spherical morphology and unique microstructure of the synthesized material.
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