Phase Boundary Structure of Li<sub><i>x</i></sub>FePO<sub>4</sub> Cathode Material Revealed by Atomic-Resolution Scanning Transmission Electron Microscopy
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- Naoya Shibata
- PRESTO, Japan Science and Technology Agency, Saitama 332-0012, Japan
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- Yuichi Ikuhara
- Nanostructures Research Laboratory, Japan Fine Ceramics Center, Nagoya 456-8587, Japan
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説明
A variety of cathode materials in lithium ion batteries exhibit phase separations during electrochemical reactions, where two phases with different Li compositions are in equilibrium across the phase interface. Because of the lattice mismatch between these phases, large structural distortions are introduced around the interface region. To characterize their potential effect upon the Li migration behavior, the phase interface structure should be determined accurately. In this study, we perform sophisticated structural analyses for phase interfaces in the well-known cathode material LixFePO4, using atomic resolution scanning transmission electron microscopy. The lattice deformation behavior and Li composition gradient are separately measured across the interface and superimposed after spatial calibrations. The combined result reveals that their relationship significantly deviates from simple models, such as Vegard’s law or other higher order interpolations. Notably, the interface region has small lattice si...
収録刊行物
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- Chemistry of Materials
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Chemistry of Materials 26 (21), 6178-6184, 2014-10-24
American Chemical Society (ACS)
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詳細情報 詳細情報について
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- CRID
- 1360283691611736960
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- ISSN
- 15205002
- 08974756
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- 資料種別
- journal article
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- データソース種別
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- Crossref
- KAKEN
- OpenAIRE
