Journal
JOURNAL OF POWER SOURCES
Volume 450, Issue -, Pages -Publisher
ELSEVIER
DOI: 10.1016/j.jpowsour.2020.227699
Keywords
Li-ion; SiO; Silicon oxide; 21700; Pre-lithiation
Funding
- French National research Agency (ANR) as part of the second Programme d'investissements d'Avenir [ANR-15-RHUS-0002]
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SiO is a promising negative electrode material to increase Li-ion batteries specific energy thanks to its high capacity and stability. However it needs to be blended in low amounts with graphite because of its poor first cycle efficiency. Here we implement new Li doped carbon coated SiO material that overcomes this limitation and enables higher energy density cells. Reference SiO grade is compared to pre-lithiated materials and SiO content up to 20% blend with graphite are evaluated in pouch and 21700 cells with more than 500 cycles obtained at 90% depth of discharge. Reaction mechanism is proposed for standard as well as pre-lithiated SiO, and generalized for SiOx. Finally we discuss behavior in hard casing full cell using this simple model to calculate volume expansion. We show with steric consideration that 40% SiO is likely the ultimate ratio practically useable in cylindrical cells.
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