Simple synthesis of SiGe@C porous microparticles as high-rate anode materials for lithium-ion batteries
We report the synthesis of SiGe@C porous microparticles (PoSiGe@C) via the decomposition of Mg 2 Si/Mg 2 Ge composites, acid pickling and subsequent carbon coating processes, respectively. The content of Ge can be tuned by the initial ratio of Mg 2 Si and Mg 2 Ge in the composite. The as-synthesized...
Saved in:
Published in | RSC advances Vol. 7; no. 54; pp. 33837 - 33842 |
---|---|
Main Authors | , , , , , , , , |
Format | Journal Article |
Language | English |
Published |
01.01.2017
|
Online Access | Get full text |
Cover
Loading…
Summary: | We report the synthesis of SiGe@C porous microparticles (PoSiGe@C)
via
the decomposition of Mg
2
Si/Mg
2
Ge composites, acid pickling and subsequent carbon coating processes, respectively. The content of Ge can be tuned by the initial ratio of Mg
2
Si and Mg
2
Ge in the composite. The as-synthesized PoSiGe@C has been used as the anode material of lithium-ion batteries, which shows an enhanced cyclic and rate performance compared to bare Si, PoSiGe as well as PoSi@C porous microparticles. Briefly, the PoSiGe@C delivers a good cycling stability with 70% capacity retention after 400 cycles and only 0.075% capacity loss per cycle at the current density of 0.8 A g
−1
. Furthermore, super rate capability is also expressed by the PoSiGe@C. The unique porous structure, and synergistic effect of Si and Ge, may lead to the inherent high lithium-ion diffusivity and electrical conductivity of Ge, and good volume alleviation, which results in the good electrochemical performance.
We synthesize the PoSiGe@C
via
the decomposition of Mg
2
Si/Mg
2
Ge composites, acid pickling and subsequent carbon coating processes, which show excellent cycling and rate performance as anode materials for lithium-ion batteries. |
---|---|
ISSN: | 2046-2069 2046-2069 |
DOI: | 10.1039/c7ra04364c |