Carbon-free high-loading silicon anodes enabled by sulfide solid electrolytes

The development of silicon anodes for lithium-ion batteries has been largely impeded by poor interfacial stability against liquid electrolytes. Here, we enabled the stable operation of a 99.9 weight % microsilicon anode by using the interface passivating properties of sulfide solid electrolytes. Bul...

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Bibliographic Details
Published in:Science (American Association for the Advancement of Science) 2021-09, Vol.373 (6562), p.1494-1499
Main Authors: Tan, Darren H S, Chen, Yu-Ting, Yang, Hedi, Bao, Wurigumula, Sreenarayanan, Bhagath, Doux, Jean-Marie, Li, Weikang, Lu, Bingyu, Ham, So-Yeon, Sayahpour, Baharak, Scharf, Jonathan, Wu, Erik A, Deysher, Grayson, Han, Hyea Eun, Hah, Hoe Jin, Jeong, Hyeri, Lee, Jeong Beom, Chen, Zheng, Meng, Ying Shirley
Format: Article
Language:English
Subjects:
Anodes
Binders
Carbon
Electrolytes
Electrolytic cells
Interface stability
Interfacial properties
Lithium
Lithium base alloys
Lithium-ion batteries
Molten salt electrolytes
Operating temperature
Rechargeable batteries
Silicon
Slurries
Solid electrolytes
Solid state
Specific capacity
Sulfides
Surface properties
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Summary:The development of silicon anodes for lithium-ion batteries has been largely impeded by poor interfacial stability against liquid electrolytes. Here, we enabled the stable operation of a 99.9 weight % microsilicon anode by using the interface passivating properties of sulfide solid electrolytes. Bulk and surface characterization, and quantification of interfacial components, showed that such an approach eliminates continuous interfacial growth and irreversible lithium losses. Microsilicon full cells were assembled and found to achieve high areal current density, wide operating temperature range, and high areal loadings for the different cells. The promising performance can be attributed to both the desirable interfacial property between microsilicon and sulfide electrolytes and the distinctive chemomechanical behavior of the lithium-silicon alloy.
ISSN:0036-8075
1095-9203
DOI:10.1126/science.abg7217