| Autor: |
Tyler Stephenson, Vincent Battaglia, Honghe Zheng, Li Zhang, Xianlin Zhang, Lili Chai, Longfei Zhang, Ming Shen |
| Rok vydání: |
2014 |
| Předmět: |
|
| Zdroj: |
Electrochimica Acta. 127:39-44 |
| ISSN: |
0013-4686 |
| Popis: |
The effect of Li-salt mixing in Li-ion battery electrolyte based on LiPF 6 in ethylene carbonate (EC) and ethyl methyl carbonate (EMC) is investigated. The addition of an appropriate amount of lithium bis(fluorosulfonyl)imide (LiFSI) into the LiPF 6 -based electrolyte contributes to an electrochemical improvement of the graphite anode. However, the LiFePO 4 cathode is difficult to cycle in such an electrolyte due to the severe corrosion of the aluminium current collector by FSI anions. Lithium bis-oxalato borate (LiBOB) is able to passivate Al and suppress the corrosion arising from the FSI anions. An improvement of rate performance and cycling stability for both the LiFePO 4 cathode and the graphite anode is obtained in 1.0 mol L −1 LiPF 6 /EC/EMC electrolyte containing 0.2 mol L −1 LiFSI and 0.2 mol L −1 LiBOB salts. Moreover, an excellent compatibility between the graphite anode and LiFePO 4 cathode in the ternary-salt electrolyte system is further confirmed by the full cell tests. The electrochemical performance improvement of the electrolyte resulting from Li-salt mixing provides a new way for optimization of electrolyte for high performance Li-ion batteries. |
| Databáze: |
OpenAIRE |
| Externí odkaz: |
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