| About this Abstract |
| Meeting |
2020 TMS Annual Meeting & Exhibition
|
| Symposium
|
Recycling of Secondary, Byproduct Materials and Energy
|
| Presentation Title |
E-56: Hydrothermal Regeneration of Cycled LiFePO4 Cathode Material from Spent Lithium Ion Batteries |
| Author(s) |
Qiankun Jing, Yubo Liu, Bao Liu, Jialiang Zhang, Chengyan Wang |
| On-Site Speaker (Planned) |
Qiankun Jing |
| Abstract Scope |
In this work, a facile hydrothermal method is proposed to directly regenerate the cycled LiFePO4 separated from spent LIBs. The component analysis by ICP-AES indicates that the cathode material LiFePO4 will lose part of reversible lithium after long-term cycling of the battery, resulting in the capacity fading. In addition, the XRD analysis shows the LiFePO4 transforms to olivine structured FePO4 because of the missing reversible lithium. Based on this, the hydrothermal process is carried out to supplement missing lithium. After a 3-hour hydrothermal process at 200 oC, the reversible lithium of regenerated LiFePO4 can be supplemented up to 93%. Also, the regenerated LiFePO4 shows excellent electrochemical performance of specific discharge capacity 135 mA h g-1 at 1 C rate, and the capacity loss is less than 1% after 100 cycles. The mechanism of the hydrothermal regeneration has also been discussed from the aspects of thermodynamics and crystal structure transformation. |
| Proceedings Inclusion? |
Planned: |