Paper
6 August 2023 A design strategy of lithium orthosilicate coating on micro-silicon for high performance lithium storage
Wengang Yan, Liang Ma, Siyuan Ma, Yu Dong, Tongren Chen, Sheng Chen, Cai Liu, Renchao Feng, Yuefeng Su, Ning Li
Author Affiliations +
Proceedings Volume 12781, International Conference on Optoelectronic Information and Functional Materials (OIFM 2023); 127813F (2023) https://doi.org/10.1117/12.2686734
Event: 2023 International Conference on Optoelectronic Information and Functional Materials (OIFM 2023), 2023, Guangzhou, JS, China
Abstract
Micron-silicon possess dense morphology and high tap density, which can improve volume and area capacity while maintaining a large specific capacity. In addition, the cost of micron silicon is low, and compared to nano silicon, it has more potential for large-scale industrialization. However, micron-silicon will suffer huge volume expansion during the charge-discharge process, which causes the active material to fall off from the fluid collector, resulting in rapid capacity degradation; In addition, the edges and corners of micro-silicon are easy to crack the surface solid-electrolyte interface (SEI), resulting in the repeated generation of SEI, which further restricts the cyclic stability of the electrode. In this work, we added a lithium source to in-situ convert the silicon oxide on the surface of micron-silicon into lithium orthosilicate (Li4SiO4) protective layer. The lithium orthosilicate coating can not only effectively alleviate the volume expansion of the silicon anode during the charging and discharging process, but also effectively avoid the direct contact between the micron silicon and the electrolyte as a protective layer, which can reducing the surface side reaction of the electrode. The prepared electrode displays a high reversible specific capacity of 1075.3 mAh g-1 after 100 cycles at 0.3C.
© (2023) COPYRIGHT Society of Photo-Optical Instrumentation Engineers (SPIE). Downloading of the abstract is permitted for personal use only.
Wengang Yan, Liang Ma, Siyuan Ma, Yu Dong, Tongren Chen, Sheng Chen, Cai Liu, Renchao Feng, Yuefeng Su, and Ning Li "A design strategy of lithium orthosilicate coating on micro-silicon for high performance lithium storage", Proc. SPIE 12781, International Conference on Optoelectronic Information and Functional Materials (OIFM 2023), 127813F (6 August 2023); https://doi.org/10.1117/12.2686734
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KEYWORDS
Lithium

Silicon

Electrodes

Anodes

Coating

Batteries

Electrolytes

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