Probing the failure mechanism of nanoscale LiFePO? for Li-ion batteries [electronic resource]

• Ngôn ngữ: eng
• Ký hiệu phân loại: 621.312 Generation, modification, storage
• Thông tin xuất bản: Richland, Wash. : Oak Ridge, Tenn. : Pacific Northwest National Laboratory (U.S.) ; Distributed by the Office of Scientific and Technical Information, U.S. Dept. of Energy, 2015
• Mô tả vật lý: Size: Article No. 203902 : , digital, PDF file.
• Bộ sưu tập: Metadata
• ID: 265957
• Chủ đề: 1. 25 energy storage; 2. 33 advanced propulsion systems; 3. 36 materials science; 4. Electron energy loss spectroscopy; 5. Environmental molecular sciences laboratory

Tóm tắt

 LiFePO<
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  is a high power rate cathode material for lithium ion battery and shows remarkable capacity retention, featuring a 91% capacity retention after 3300 cycles. In this work, we use high-resolution transmission electron microscopy (HRTEM), energy dispersive x-ray spectroscopy (EDS), and electron energy loss spectroscopy (EELS) to study the gradual capacity fading mechanism of LiFePO<
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  materials. We found that upon prolonged electrochemical cycling of the battery, the LiFePO<
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 4<
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  cathode shows surface amorphization and loss of oxygen species, which directly contribute to the gradual capacity fading of the battery. The finding is of great importance for the design and improvement of new LiFePO<
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 4<
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  cathode for high-energy and high-power rechargeable battery for electric transportation.