Overcharging a lithium-ion battery: Effect on the Li sub(x)C sub(6) negative electrode determined by in situ neutron diffraction

In situ neutron powder diffraction measurements of a commercial lithium-ion battery reveal perturbations to the phase evolution of the Li sub(x)C sub(6) electrode caused by overcharge. Above similar to 4.5 V the anode is entirely composed of LiC sub(6). During discharge from the post-overcharged sta...

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Bibliographic Details
Published inJournal of power sources Vol. 244; pp. 695 - 701
Main Authors Sharma, N, Peterson, V K
Format Journal Article
LanguageEnglish
Published 15.12.2013
Subjects
Anodes
Charge
Cycles
Discharge
Electrodes
Evolution
Graphite
Lithium-ion batteries
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Summary:In situ neutron powder diffraction measurements of a commercial lithium-ion battery reveal perturbations to the phase evolution of the Li sub(x)C sub(6) electrode caused by overcharge. Above similar to 4.5 V the anode is entirely composed of LiC sub(6). During discharge from the post-overcharged state LiC sub(6) persists to the 90% discharge state, compared with its persistence to the 27% discharge state during conventional cycling. At the completely discharged state the post-overcharged anode is a mixture of LiC sub(12), LiC sub(18), and graphite, while the conventionally cycled anode is composed of graphite alone. The phase evolution of a post-overcharged battery during charge also differs relative to conventional cycling, most noticeably until the 9% state of charge.
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ISSN:0378-7753