摘要
We successfully achieved surface modification of Si at a low temperature (150 °C) by using citric acid and ascorbic acid as surface modifiers and enhanced the electrochemical performance of a Si-based anode. A simple planetary ball-milling process followed by heat treatment over a range of temperatures (150-500 °C) was used to carry out the surface modification. This important investigation confirmed that the heat treatment temperature significantly affected the molecular structure in the modification layer, and its thickness led to a higher discharge capacity for low-temperature-modified Si compared to that in other series of high-temperature-annealed samples. Among all the surface-modified Si samples, the electrochemical performance using the M-Si 150 °C as the anode material achieved an excellent capacity of 1787 mAh g-1after 100 charge/discharge cycles with a 75.8% retention. The same device delivered excellent rate capability, with a capacity of ∼1012 mAh g-1(1 C) and 593 mAh g-1(2 C) at the high-current rate. The capacity regained to ∼2012 mAh g-1with the reversal of the current rate to 0.1 C, with a very high retention of 103%, indicating significantly enhanced strength of the modified Si anode in a lithium-ion battery.
原文 | English |
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文章編號 | 011001 |
期刊 | Journal of Electrochemical Energy Conversion and Storage |
卷 | 20 |
發行號 | 1 |
DOIs | |
出版狀態 | Published - 2023 2月 1 |
All Science Journal Classification (ASJC) codes
- 電子、光磁材料
- 可再生能源、永續發展與環境
- 能源工程與電力技術
- 材料力學
- 機械工業