期刊
JOURNAL OF THE AMERICAN CHEMICAL SOCIETY
卷 135, 期 15, 页码 5497-5500出版社
AMER CHEMICAL SOC
DOI: 10.1021/ja312527x
关键词
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资金
- Research and Development Initiative for Scientific Innovation of New Generation Battery (RISING) Project under the New Energy and Industrial Technology Development Organization (NEDO), Japan
The phase transition between LiFePO4 and FePO4 during nonequilibrium battery operation was tracked in real time using time-resolved X-ray diffraction. In conjunction with increasing current density, a metastable crystal phase appears in addition to the thermodynamically stable LiFePO4 and FePO4 phases. The metastable phase gradually diminishes under open-circuit conditions following electrochemical cycling. We propose a phase transition path that passes through the metastable phase and posit the new phase's role in decreasing the nucleation energy, accounting for the excellent rate capability of LiFePO4. This study is the first to report the measurement of a metastable crystal phase during the electrochemical phase transition of LixFePO4.
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