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Visualizing the chemistry and structure dynamics in lithium-ion batteries by in-situ neutron diffraction.

ABSTRACT: We report an in-situ neutron diffraction study of a large format pouch battery cell. The succession of Li-Graphite intercalation phases was fully captured under an 1C charge-discharge condition (i.e., charge to full capacity in 1 hour). However, the lithiation and dilithiation pathways are distinctively different and, unlike in slowing charging experiments with which the Li-Graphite phase diagram was established, no LiC₂₄ phase was found during charge at 1C rate. Approximately 75 mol. % of the graphite converts to LiC₆ at full charge, and a lattice dilation as large as 4% was observed during a charge-discharge cycle. Our work demonstrates the potential of in-situ, time and spatially resolved neutron diffraction study of the dynamic chemical and structural changes in "real-world" batteries under realistic cycling conditions, which should provide microscopic insights on degradation and the important role of diffusion kinetics in energy storage materials.

SUBMITTER: Wang XL 

PROVIDER: S-EPMC3475991 | biostudies-literature | 2012

REPOSITORIES: biostudies-literature

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Visualizing the chemistry and structure dynamics in lithium-ion batteries by in-situ neutron diffraction.

Wang Xun-Li XL   An Ke K   Cai Lu L   Feng Zhili Z   Nagler Stephen E SE   Daniel Claus C   Rhodes Kevin J KJ   Stoica Alexandru D AD   Skorpenske Harley D HD   Liang Chengdu C   Zhang Wei W   Kim Joon J   Qi Yue Y   Harris Stephen J SJ  

Scientific reports 20121019

We report an in-situ neutron diffraction study of a large format pouch battery cell. The succession of Li-Graphite intercalation phases was fully captured under an 1C charge-discharge condition (i.e., charge to full capacity in 1 hour). However, the lithiation and dilithiation pathways are distinctively different and, unlike in slowing charging experiments with which the Li-Graphite phase diagram was established, no LiC₂₄ phase was found during charge at 1C rate. Approximately 75 mol. % of the g  ...[more]

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