Abstract
Aiming at improving the capacity retention abilities of LiMn 2O4/graphite based Li-ion batteries (LIBs) at high temperatures, we report on 2-(triphenylphosphoranylidene) succinic anhydride (TPSA) as a new electrolyte additive. The unit cells with 0.1 wt.% of TPSA achieved a 43% capacity retention increase at high temperature operation (55 C, 100 cycles, C/2 rate) compared to a control group without the additive. To understand the underlying principle on the enhanced capacity retention ability of the unit cells, the effect of TPSA was investigated by cyclic voltammetry, X-ray photoelectron spectroscopy, auger electron spectroscopy, and galvanostatic measurements. The results suggest that the electrochemical decomposition of TPSA takes place on both surfaces of the LiMn2O4 and graphite during precycling, thereby reducing the decomposition reaction of the electrolyte during subsequent cycles.
| Original language | English |
|---|---|
| Pages (from-to) | 97-103 |
| Number of pages | 7 |
| Journal | Electrochimica Acta |
| Volume | 102 |
| DOIs | |
| State | Published - 2013 |
Bibliographical note
Funding Information:This work was supported financially by the “The Middle and Long-term Technology Development Project” of the Ministry of Knowledge Economy of Korea (MKE) ( 10032242 ) and a grant from by the Korea Science & Engineering Foundation (KOSEF) (WCU program, 31-2008-000-10055-0) funded by the Ministry of Education and Science & Technology (MEST) . This research was also financially supported by the “Inter-ER Cooperation Projects” of the Ministry of Knowledge Economy (MKE), and Korea Institute for Advancement of Technology (KIAT) .
Keywords
- 2-(triphenylphosphoranylidene) succinic anhydride (TPSA)
- Graphite
- High temperature
- Li-ion batteries (LIBs)
- LiMn O