Journal
ACS APPLIED MATERIALS & INTERFACES
Volume 6, Issue 3, Pages 1702-1708Publisher
AMER CHEMICAL SOC
DOI: 10.1021/am404608d
Keywords
silicon; manganese; reduced graphene oxide; lithium-ion batteries; anodes
Funding
- National Research Foundation [2012M1A2A2671795, 2012S1A2A1A01031215]
- Global Frontier R&D Program of the Center for Multiscale Energy System [2012M3A6A7055540]
- Basic Science Research Program [2012-0009158]
- National Research Foundation under the Ministry of Science, ICT Future, Korea
- LG Yonam Foundation
- National Research Foundation of Korea [2012S1A2A1A01031215] Funding Source: Korea Institute of Science & Technology Information (KISTI), National Science & Technology Information Service (NTIS)
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Although Si is a promising high-capacity anode material for Li-ion batteries (LIB), it suffers from capacity fading due to excessively large volumetric changes upon Li insertion. Nanocarbon materials have been used to enhance the cyclic stability of LIB anodes, but they have an inherently low specific capacity. To address these issues, we present a novel ternary nanocomposite of Si, Mn, and reduced graphene oxide (rGO) for LIB anodes, in which the Si Mn alloy offers high capacity characteristics and embedded rGO nanosheets confer structural stability. Si-Mn/rGO ternary nanocomposites were synthesized by mechanical complexation and subsequent thermal reduction of mixtures of Si nanoparticles, MnO2 nanorods, and rGO nanosheets. Resulting ternary nanocomposite anodes displayed a specific capacity of 600 mAh/g with similar to 90% capacity retention after 50 cycles at a current density of 100 mA/g. The enhanced performance is attributed to facilitated Li-ion reactions with the MnSi alloy phase and the formation of a structurally reinforced electroconductive matrix of rGO nanosheets. The ternary nanocomposite design paradigm presented in this study can be exploited for the development of high-capacity and long-life anode materials for versatile LIB applications.
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