Chemical 'Pickling' of Phosphite Additives Mitigates Impedance Rise in Li Ion Batteries
| Autor: | Ritu Sahore, Adam Tornheim, Juan C. Garcia, Hakim Iddir, Ilya A. Shkrob, Cameron Peebles, Chen Liao, Javier Bareño, Daniel P. Abraham |
|---|---|
| Rok vydání: | 2018 |
| Předmět: |
Trimethylsilyl
020209 energy Inorganic chemistry chemistry.chemical_element 02 engineering and technology Electrolyte 021001 nanoscience & nanotechnology Cathode Surfaces Coatings and Films Electronic Optical and Magnetic Materials law.invention chemistry.chemical_compound General Energy Transition metal chemistry law Electrode Pickling 0202 electrical engineering electronic engineering information engineering Lithium Physical and Theoretical Chemistry 0210 nano-technology Boron |
| Zdroj: | The Journal of Physical Chemistry C. 122:9811-9824 |
| ISSN: | 1932-7455 1932-7447 |
| DOI: | 10.1021/acs.jpcc.8b02056 |
| Popis: | The use of high-voltage, high-capacity positive electrodes in lithium ion batteries presents a challenge, given their tendency to degrade organic electrolytes. To prevent this damage, electrolyte additives modifying the cathode surface are required. Tris(trimethylsilyl) phosphite (TMSPi) is one such electrolyte additive. However, the mechanism for its protective action (similar to other phosphite, borate, and boroxane compounds) remains not completely understood. In LiPF6 containing carbonate electrolytes, TMSPi undergoes reactions yielding numerous products. Here we demonstrate that one of these products, PF2OSiMe3, is responsible for mitigation of the impedance rise that occurs in aged cells during charge/discharge cycling. This same agent can also be responsible for reducing parasitic oxidation currents and transition metal loss during prolonged cell cycling. Mechanistic underpinnings of this protective action are examined using computational methods. Our study suggests that this beneficial action orig... |
| Databáze: | OpenAIRE |
| Externí odkaz: |
|