Sulfide heave: Key factor governing cathode deterioration in pouch Li S cells

This work introduces a novel concept of sulfide heave to account for cathode deterioration in Li−S pouch cell. Caused by the repeated sulfur segregation and sequent lithiation, sulfide heave leads to cavity formation in electrode-layer during cycling. Pressurizing cathode successfully suppresses sul...

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Bibliographic Details
Published in:Electrochimica acta 2019-03, Vol.300, p.150-155
Main Authors: Maiga, Ousmane I.A., Li, R., Ye, K.F., Liu, B.H., Li, Z.P.
Format: Article
Language:English
Subjects:
Cathodes
Deterioration
Flux density
Heaving
Lithium
Lithium-ion batteries
Pressurization
Rechargeable batteries
Sulfur
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Summary:This work introduces a novel concept of sulfide heave to account for cathode deterioration in Li−S pouch cell. Caused by the repeated sulfur segregation and sequent lithiation, sulfide heave leads to cavity formation in electrode-layer during cycling. Pressurizing cathode successfully suppresses sulfide heaving, achieving high and stable areal energy density. The pressurized cathode with sulfur loading of 90 wt% demonstrates an energy density of 11.7 mW h cm−2 and retains 8.4 mW h cm−2 after 900 cycles at 0.2C under 600 kg cm−2. When increasing the areal S-loading up to 15.125 mg cm−2, a stable areal energy density of 19.24 mW h cm−2 is reached, which is 1.7 times as high as that of cathodes in current Li-ion batteries.
ISSN:0013-4686
1873-3859
DOI:10.1016/j.electacta.2019.01.070