SiO-induced thermal instability and interplay between graphite and SiO in graphite/SiO composite anode

Ban Seok Lee, Sang-Hwan Oh, Yoon Jeong Choi, Min-Jeong Yi, So Hee Kim, Shin-Yeong Kim, Yung-Eun Sung, Sun Young Shin, Yongju Lee and Seung-Ho Yu ()
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Ban Seok Lee: Korea University
Sang-Hwan Oh: Korea University
Yoon Jeong Choi: Korea University
Min-Jeong Yi: Korea University
So Hee Kim: Korea Institute of Science and Technology (KIST)
Shin-Yeong Kim: Seoul National University
Yung-Eun Sung: Seoul National University
Sun Young Shin: LG Energy Solution, Research Park
Yongju Lee: LG Energy Solution, Research Park
Seung-Ho Yu: Korea University

Nature Communications, 2023, vol. 14, issue 1, 1-12

Abstract: Abstract Silicon monoxide (SiO), which exhibits better cyclability compared to silicon while delivering higher capacity than that of graphite, is an adequate material for the development of lithium-ion batteries (LIBs) having higher energy densities. However, incorporating silicon-based materials including SiO into stable graphite anode inevitably degrades not only cycle life but also calendar life of LIBs, while little is known about their aging mechanisms. Here, SiO-induced thermal instability of the graphite/SiO composite anode is investigated. We reveal that under thermal exposure, SiO accelerates the loss of lithium inventory and concomitantly facilitates the lithium de-intercalation from graphite. This self-discharge phenomenon, which is weakly observed in the graphite anode without SiO, is the result of preferential parasitic reaction on the SiO interface and spontaneous electron and lithium-ion migration to equilibrate the electron energy imbalance between graphite and SiO. Understanding this underlying electron-level interplay between graphite and SiO in the composite anode will contribute toward improving shelf life of SiO-containing LIBs in actual operating conditions.

Date: 2023
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DOI: 10.1038/s41467-022-35769-2

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