Structural Changes in Si–CuSi Films upon Intercalation of Lithium Ions

We studied the possibility of using composite films representing amorphous silicon reinforced with crystalline inclusions of copper silicide as an anode material for lithium-ion batteries with liquid electrolyte. The films were made by layer-by-layer magnetron sputtering of amorphous silicon and cop...

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Bibliographic Details
Published in:Technical physics letters 2019-10, Vol.45 (10), p.973-976
Main Authors: Buchin, E. Yu, Mironenko, A. A., Naumov, V. V., Rudyi, A. S., Fedorov, I. S.
Format: Article
Language:English
Subjects:
30 DIRECT ENERGY CONVERSION
Amorphous silicon
ANNEALING
Anode effect
ANODES
Classical and Continuum Physics
CLATHRATES
CONDENSED MATTER PHYSICS, SUPERCONDUCTIVITY AND SUPERFLUIDITY
Copper
COPPER SILICIDES
Electrode materials
ELECTROLYTES
Inclusions
INHOMOGENEOUS FIELDS
LAYERS
LIQUIDS
Lithium
LITHIUM ION BATTERIES
LITHIUM IONS
Low temperature
Magnetron sputtering
MAGNETRONS
NANOCOMPOSITES
Photovoltaic cells
Physics
Physics and Astronomy
Rechargeable batteries
Silicides
SILICON
SPUTTERING
STRESSES
TEMPERATURE RANGE 0273-0400 K
THIN FILMS
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Summary:We studied the possibility of using composite films representing amorphous silicon reinforced with crystalline inclusions of copper silicide as an anode material for lithium-ion batteries with liquid electrolyte. The films were made by layer-by-layer magnetron sputtering of amorphous silicon and copper, followed by low-temperature (100–200°C) annealing of the structure. The tests of the anodes revealed the effect of prolonged intense growth of their reversible capacity. To describe the effect, a phenomenological model based on the multidirectional migration of silicon and copper atoms in an inhomogeneous field of elastic mechanical stresses arising during electrode cycling is proposed.
ISSN:1063-7850
1090-6533
DOI:10.1134/S1063785019100043