Possibility of Recycling SiOx Particles Collected at Silicon Ingot Production Process as an Anode Material for Lithium Ion Batteries

Junghyun Kim,So Yeun Kim,Gyo Woo Lee,Cheol-Min Yang

doi:10.1038/s41598-019-50011-8

Junghyun Kim, So Yeun Kim + Show 2 more

Open Access

https://doi.org/10.1038/s41598-019-50011-8

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Abstract

Recently, some studies have utilized silicon (Si) as an anode material of lithium ion battery by recycling Si from the slurry of wafer slicing dust. The filtration of Si particles condensed from Si vapors that were exhausted from the ingot growing furnace could propose another method of Si recycling. In this study, we investigated the possibility of using such collected silicon oxides (SiOx) particles as an anode material. After collecting SiOx particles, FE-SEM, TEM, EDS, XRD, XPS analysis, and charge/discharge test were carried out to investigate characteristics and usability of these particles. FE-SEM and FE-TEM images showed that these particles mainly consisted of spherical primary particles with a diameter of 10 nm or less. Agglomerates of these primary particles were larger than 300 nm in diameter. In TEM image and EDS analysis, crystalline particles were observed along with amorphous particles. As a result of XRD analysis, amorphous silica (SiO2) and crystalline Si were observed. Charge/discharge tests were carried out to determine the feasibility of using these particles as an anode material for lithium ion batteries. A cycle efficiency of 40.6% was obtained in the test in which the total number of charge/discharge cycle was 100 under the condition of C-rate 0.2 for the first three times and C-rate 1.0 for the remaining 97 times. Results showed that these collected particles could be used as an anode material for lithium ion batteries.

Highlights

In the charge/ discharge test, the battery capacity maintenance efficiency was 40.6% compared to the initial discharge amount after up to 100 cycles and the coulombic efficiency was more than 99% after 5 cycles
This study showed that the recycling SiOx particles exhausted from the Si ingot grower is environmentally friendly and economical
The images or other third party material in this article are included in the article’s Creative Commons license, unless indicated otherwise in a credit line to the material

Summary

Material for Lithium Ion Batteries

Some studies have utilized silicon (Si) as an anode material of lithium ion battery by recycling Si from the slurry of wafer slicing dust. A cycle efficiency of 40.6% was obtained in the test in which the total number of charge/ discharge cycle was 100 under the condition of C-rate 0.2 for the first three times and C-rate 1.0 for the remaining 97 times Results showed that these collected particles could be used as an anode material for lithium ion batteries. We investigated the possibility of recycling the silicon oxides (SiOx) particles mixed with crystalline Si collected from Si vapors in the ingot growing process. It is expected that the coexistence of Si crystal and amorphous silica (SiO2) particles could be helpful to achieve good electrochemical performances as an anode material for lithium ion batteries. The proposed approach is based on a facile, green, and cost-effective process

Results and Discussion

Summary and Conclusion

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