Research on Prelithiation Technique for Lithium Ion Batteries
| Autor: | Chao-Yen Kuo, 郭昭延 |
|---|---|
| Rok vydání: | 2014 |
| Druh dokumentu: | 學位論文 ; thesis |
| Popis: | 102 In this research, the decomposable characteristic of lithium compound into Li+ is applied to prelithiation technique in our research. During full cell charging, Li+ released from lithium compound will intercalate into anode material and return to cathode material during discharging. In this way, non-lithiated cathode material can be applied in the system of lithium ion battery. By charging lithium compound electrode with current density of 10 mA/gx, the weight ratio combination of lithium compound: conductive carbon: binder= 30: 60: 10 stands out to have the best conversion of approximately 200 mAh/gmixture and the lowest overpotential, 4 V. Furthermore, by applying the current density of 50 mA/gx, the charging time is nearly 10 hours, which equals to 0.1 C, and produce 410 mAh/gx. Next, we investigated the electrochemical performance of TiO2, the cathode material we selected, and observed that after being annealed at 400oC, it has the best cycling performance at 0.1 C, of which reversible capacity is 200 mAh/g and the retention is 99% after cycling for 50 cycles, and has the best rate capability. During the half cell test of Lihium compound/TiO2, side reactions occured during discharging period of prelithiation, and the effect is more significant in the full cell of lithium compound/TiO2 and MCMB, which consumes Li+ and affecting electrochemical performance,. After disassembling and reassembling the cell after prelithiation charging process, the phenomenon is improved. We also applied the technique in C/S system, but NMP might cause C/S and lithium compound to react to become Li2SO4•H2O, and the mechanism needs to be further investigated. |
| Databáze: | Networked Digital Library of Theses & Dissertations |
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