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

被引：163

作者：

Wang, Xun-Li ^{[1
,2
]}

An, Ke ^{[1
]}

Cai, Lu ^{[1
]}

Feng, Zhili ^{[3
]}

Nagler, Stephen E. ^{[4
]}

Daniel, Claus ^{[3
,5
]}

Rhodes, Kevin J. ^{[3
,5
]}

Stoica, Alexandru D. ^{[1
]}

Skorpenske, Harley D. ^{[1
]}

Liang, Chengdu ^{[6
]}

Zhang, Wei ^{[3
]}

Kim, Joon ^{[7
]}

Qi, Yue ^{[8
]}

Harris, Stephen J. ^{[8
]}

机构：

[1] Oak Ridge Natl Lab, Chem & Engn Mat Div, Oak Ridge, TN 37831 USA

[2] City Univ Hong Kong, Dept Phys & Mat Sci, Kowloon, Hong Kong, Peoples R China

[3] Oak Ridge Natl Lab, Mat Sci & Technol Div, Oak Ridge, TN 37831 USA

[4] Oak Ridge Natl Lab, Quantum Condensed Matter Div, Oak Ridge, TN 37831 USA

[5] Univ Tennessee, Dept Mat Sci & Engn, Knoxville, TN 37996 USA

[6] Oak Ridge Natl Lab, Ctr Nanophase Mat Sci, Oak Ridge, TN 37831 USA

[7] Dow Kokam LLC, Lees Summit, MO 64064 USA

[8] Gen Motors R&D Ctr, Warren, MI 48090 USA

来源：

SCIENTIFIC REPORTS | 2012年 / 2卷

关键词：

INTERCALATION; GRAPHITE; ELECTRODE; KINETICS; CELL;

D O I：

10.1038/srep00747

中图分类号：

O [数理科学和化学]; P [天文学、地球科学]; Q [生物科学]; N [自然科学总论];

学科分类号：

07 ; 0710 ; 09 ;

摘要：

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.

引用

页数：7

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