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| Influence of Titanium Concentration on Lithium-Storage Performance of Silicon-Titanium Composite |
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Received:November 17, 2019
Revised:November 19, 2019
Accepted:November 20, 2019
Published Online:March 17, 2020
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| DOI：doi：10.3969/j.issn.1007-7545.2020.04.015 |
| KeyWord:silicon-titanium anode; titanium concentration; lithiation-storage performance; lithium-ion battery anode |
| Author | Institution |
| ZHANG Ying-jie |
昆明理工大学 冶金与能源工程学院 |
| ZHOU Zhong-ren |
昆明理工大学 冶金与能源工程学院 |
| DONG Peng |
昆明理工大学 冶金与能源工程学院 |
| ZHANG Ju-feng |
昆明理工大学 冶金与能源工程学院 |
| XIA Guang-hui |
昆明理工大学 冶金与能源工程学院 |
| SHI Han-cheng |
昆明理工大学 冶金与能源工程学院 |
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| Abstract: |
| In order to investigate effect of titanium concentration on lithium-storage performance of silicon-titanium composite, silicon-titanium composite with titanium mass fraction of 3.3%, 6.4% and 8% was selected as anode of lithium-ion battery to investigate its electrochemical performance. The results suggest that addition of titanium is independent on lithiation/delithiation reaction potentials of active silicon, but affects lithium-storage performance of anode greatly. The first lithiation specific capacity of silicon-titanium composite drops and initial columbic efficiency of anode rises with increase of titanium concentration in silicon-titanium composite. When titanium concentration is 8%, lithiation-storage performance of anode reaches the best values with the first discharge specific capacity of 2 107.02 mAh/g and initial columbic efficiency of 89.95%. After cycling for 50 times, the specific capacity retention ratio of anode is 80.72% with average capacity decaying ratio of 0.38% per-cycle. |
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