共 39 条
Impact of Surface Chemistry of Silicon Nanoparticles on the Structural and Electrochemical Properties of Si/Ni3.4Sn4 Composite Anode for Li-Ion Batteries
被引:3
|作者:
Azib, Tahar
[1
]
Thaury, Claire
[1
,2
]
Cuevas, Fermin
[1
]
Leroy, Eric
[1
]
Jordy, Christian
[2
]
Marx, Nicolas
[3
]
Latroche, Michel
[1
]
机构:
[1] Univ Paris Est Creteil, CNRS, ICMPE, UMR 7182, 2 Rue Henri Dunant, F-94320 Thiais, France
[2] SAFT Batteries, 113 Bd Alfred Daney, F-33074 Bordeaux, France
[3] Umicore, Watertorenstr 33, B-2250 Olen, Belgium
关键词:
Li-ion batteries;
anodes;
intermetallics;
silicon;
composites;
nanomaterials;
coating;
mechanochemistry;
D O I:
10.3390/nano11010018
中图分类号:
O6 [化学];
学科分类号:
0703 ;
摘要:
Embedding silicon nanoparticles in an intermetallic matrix is a promising strategy to produce remarkable bulk anode materials for lithium-ion (Li-ion) batteries with low potential, high electrochemical capacity and good cycling stability. These composite materials can be synthetized at a large scale using mechanical milling. However, for Si-Ni3Sn4 composites, milling also induces a chemical reaction between the two components leading to the formation of free Sn and NiSi2, which is detrimental to the performance of the electrode. To prevent this reaction, a modification of the surface chemistry of the silicon has been undertaken. Si nanoparticles coated with a surface layer of either carbon or oxide were used instead of pure silicon. The influence of the coating on the composition, (micro)structure and electrochemical properties of Si-Ni3Sn4 composites is studied and compared with that of pure Si. Si coating strongly reduces the reaction between Si and Ni3Sn4 during milling. Moreover, contrary to pure silicon, Si-coated composites have a plate-like morphology in which the surface-modified silicon particles are surrounded by a nanostructured, Ni3Sn4-based matrix leading to smooth potential profiles during electrochemical cycling. The chemical homogeneity of the matrix is more uniform for carbon-coated than for oxygen-coated silicon. As a consequence, different electrochemical behaviors are obtained depending on the surface chemistry, with better lithiation properties for the carbon-covered silicon able to deliver over 500 mAh/g for at least 400 cycles.
引用
收藏
页码:1 / 14
页数:14
相关论文