期刊
ACS APPLIED ENERGY MATERIALS
卷 4, 期 3, 页码 2741-2750出版社
AMER CHEMICAL SOC
DOI: 10.1021/acsaem.1c00023
关键词
silica; tin; anode; composite; lithium-ion battery; chemo-mechanical simulation
资金
- National Natural Science Foundation of China [11874282, 11604245, 11981240429]
- Six Talent Peaks Project in Jiangsu Province [2019-XNY-074]
- Vice President Project of Industry-University-Research Cooperation in Science and Technology of Jiangsu Province [BY2020675]
- National 1000 Talents Program of China tenable at the Huazhong University of Science and Technology (HUST), China
By optimizing the molar ratio of SiO2/Sn to 10:1, the synergistic effect of Li storage between SiO2 and Sn can lead to the simultaneous achievement of improved Li kinetics and ensured mechanical integrity, contributing to the excellent electrochemical performance of the composite with a large reversible capacity of 613 mAh g(-1) at 100 mA g(-1), a remarkable rate capability of 450 mAh retained at 1000 mA g(-1), and long-term cycling durability with similar to 95% capacity retention over 200 cycles.
Silica (SiO2) is considered as a promising candidate anode material for next-generation lithium-ion batteries (LIBs) owing to its low cost, abundant reserve on Earth, and relatively high theoretical specific capacity. However, the development of SiO2-based anode materials has been impeded by their poor electrical conductivity and sluggish charge-transfer kinetics. Herein, porous SiO2/tin (SiO2@Sn) composites with tunable SiO2 to Sn molar ratios are fabricated using a scalable, simple, and low-cost ball-milling and low-temperature thermal-melting combined method. It is found that the Sn phase can significantly improve the diffusion and migration kinetics of Li in the composites, whereas the SiO2 to Sn molar ratio plays a key role in the mechanical integrity and subsequent cycling behaviors of the composite electrodes. By optimizing the molar ratio of SiO2/Sn to 10:1, the synergistic effect of Li storage between SiO2 and Sn can lead to the simultaneous achievement of improved Li kinetics and ensured mechanical integrity, contributing to the excellent electrochemical performance of the composite with a large reversible capacity of 613 mAh g(-1) at 100 mA g(-1), a remarkable rate capability of 450 mAh retained at 1000 mA g(-1), and long-term cycling durability with similar to 95% capacity retention over 200 cycles.
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