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Effect of Temperature on the Performance and Stability of Silicon Electrodes

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Abstract:
The purpose of these experiments is to study the thermal effect of silicon electrode lithium ion battery during high temperature aging. The main reasons for this work are as follows: (1) High temperature has a greater impact on the internal resistance of the battery, charge and discharge capacity as well as efficiency; (2) Temperature plays a role in the safety performance of the battery the vital role; (3) In use and storage, the battery needs to face different temperature ranges. The experiment mainly obtained different SEI (Solid Electrolyte Interphase) by controlling the coating of silicon oxide on the silicon anode and controlling the initial cycle rate. The lithium loss during aging is obtained by taking the delithiation capacity before and after high-temperature aging, which corresponds to self-discharge. In the experiment, the combination of the 5nm SiO coating and the initial C/20 cycle has the best performance, and the average lithium loss is 46.5 ± 12.3%, while the combination without the silicon oxide coating and the initial cycle of C/2 has the worst performance. The key to obtaining less lithium loss lies in the following points. Firstly, the SiO coating itself helps reduces the electron conductivity. Secondly, the SiO coating brings thicker SEI, which is also helpful to prevent the leakage of electron. Last, the SiO coating and the change of initial cycle change the composition of the SEI as well as the Si bulk below the SEI. These changes demonstrate a good ability to limit electronic leakage.
Notes:
Thesis (Sc. M.)--Brown University, 2020

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Citation

Wang, Chongyuan, "Effect of Temperature on the Performance and Stability of Silicon Electrodes" (2020). Materials Science Engineering Theses and Dissertations. Brown Digital Repository. Brown University Library. https://doi.org/10.26300/ktv5-p802

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