期刊
COATINGS
卷 13, 期 3, 页码 -出版社
MDPI
DOI: 10.3390/coatings13030555
关键词
germanium; graphite film; lithium-ion battery; magnetron sputtering
A one-step method for preparing germanium (Ge) hybrid film using top-down magnetron sputtering technique is presented. To suppress volume changes of Ge, a multilayered electrically conductive nickel film is deposited between multilayered Ge films. The composite film anode showed an initial discharge and charge capacity of 1180.7 and 949.3 mAh g(-1), respectively, and maintained an average capacity of 580 mAh g(-1) after 280 cycles. The Ge composite demonstrated a reversible capacity of 1163.1 mAh g(-1) in rate capability measurement.
Using a top-down magnetron sputtering technique with a high deposition-rate, a one-step method for preparing germanium (Ge) hybrid film is presented. At present, graphite film is used as a current collector because it is flexible, self lubricating, and possesses a stress-strain-relieving property. In order to further suppress the volume changes of the Ge, a multilayered electrically conductive nickel film is deposited between multilayered Ge films. The cells are cycled at a current density of 200 mA g(-1). An initial discharge and charge capacity of 1180.7 and 949.3 mAh g(-1) are achieved by the prepared integrated pyramid patterned Ge composite film anode, respectively. The average capacity was maintained at 580 mAh g(-1) after 280 cycles. In the rate capability measurement, the Ge composite demonstrated a reversible capacity of 1163.1 mAh g(-1). It is easily made using magnetron sputtering, which is widely accepted in the industry. A physical approach to increase pure Ge's specific capacity and its cycle life for LIBs is demonstrated in this work.
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