کد مقاله | کد نشریه | سال انتشار | مقاله انگلیسی | نسخه تمام متن |
---|---|---|---|---|
4767502 | 1424134 | 2017 | 18 صفحه PDF | دانلود رایگان |
عنوان انگلیسی مقاله ISI
Novel insights into higher capacity from the Li-ion battery cathode material Li2FeSiO4
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موضوعات مرتبط
مهندسی و علوم پایه
مهندسی شیمی
مهندسی شیمی (عمومی)
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![عکس صفحه اول مقاله: Novel insights into higher capacity from the Li-ion battery cathode material Li2FeSiO4 Novel insights into higher capacity from the Li-ion battery cathode material Li2FeSiO4](/preview/png/4767502.png)
چکیده انگلیسی
A highly reactive composite cathode material incorporating nano-particles of the popular Li-ion battery cathode material Li2FeSiO4 (LFS) is here studied to probe the activation of the controversial Fe3+/Fe4+ redox couple in exploiting the second Li-ion in the formula unit - for use in rechargeable Li-ion batteries. A novel form of in situ Mössbauer spectroscopy is used to monitor the oxidation state of the Fe-ions in symmetric LFS || LFS cells. This is based on mapping the poorly resolvable Mössbauer spectra from the expected Fe3+/Fe4+ redox couple in the working electrode onto the highly resolvable Fe2+/Fe3+ spectra from the counter electrode. Comparison of such data from half-delithiated Li(1)Fe3+SiO4 || Li(1)Fe3+SiO4 and almost lithium-free “Li(0)Fe4+SiO4 || Li(0)Fe4+SiO4” symmetric cells is demonstrated - to distinguish the electrode reactions from the those involving the electrolyte. Lithium is shown to cycle reversibly in the symmetric cells. However, a large proportion of the cycled lithium (â¼70%) does not derive from the bulk of the electrodes, but is rather a result of high-V electrolyte degradation, where charge balance is maintained by leaching lithium from the electrolyte and inserting it into the electrodes.
ناشر
Database: Elsevier - ScienceDirect (ساینس دایرکت)
Journal: Electrochimica Acta - Volume 223, 1 January 2017, Pages 109-114
Journal: Electrochimica Acta - Volume 223, 1 January 2017, Pages 109-114
نویسندگان
Anti Liivat, Josh Thomas, Jianghuai Guo, Yong Yang,