Dynamic Lithium Intercalation/Deintercalation in 18650 Lithium Ion Battery by Time-Resolved High Energy Synchrotron X-Ray Diffraction
<p dir="ltr">A time-resolved in situ high energy synchrotron X-ray diffraction (HESXRD) technique is employed to study the lithiation/delithiation of cathode/anode in a commercial 18650 battery under real working condition (current rate is 4 C). The phases and their changes in both t...
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| المؤلف الرئيسي: | |
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| مؤلفون آخرون: | , , , , , |
| منشور في: |
2015
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| الملخص: | <p dir="ltr">A time-resolved in situ high energy synchrotron X-ray diffraction (HESXRD) technique is employed to study the lithiation/delithiation of cathode/anode in a commercial 18650 battery under real working condition (current rate is 4 C). The phases and their changes in both the cathode and anode are identified simultaneously. For the anode component, during the charge process, as well as the LixC6 phase, a lithium-rich phase close to LiC<sub>6</sub> phase and a series of intermediate phases between the Li<sub>0.5</sub>C<sub>6</sub> and LiC<sub>6</sub> phases are observed. A distinct lithium intercalation/deintercalation mechanism is proposed for the cathode. The transforms of LiFePO<sub>4</sub> into the FePO<sub>4</sub> consists three periods with different components of phases, i.e., LiFePO<sub>4</sub> + lithium-deficient solid solution phases (period I), FePO<sub>4</sub> + LiFePO<sub>4</sub> phases (period II), and FePO<sub>4</sub> + lithium-rich solid solution phases (period III). The changes in both the andode and cathode during the discharge process are just inversed to those occurrs during the charge process. The present work indicates that dynamic lithiation/delithaition process under real working condition is different from those at the thermodynamic state, and the in situ HESXRD is one of the most promising technique to monitor such kind of dynamic lithium behavior.</p><h2>Other Information</h2><p dir="ltr">Published in: Journal of The Electrochemical Society<br>License: <a href="http://creativecommons.org/licenses/by/4.0/" rel="noreferrer" target="_blank">http://creativecommons.org/licenses/by/4.0/</a><br>See article on publisher's website: <a href="https://dx.doi.org/10.1149/2.0771510jes" target="_blank">https://dx.doi.org/10.1149/2.0771510jes</a></p> |
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