Hexagonal Boron Nitride‐Based Electrolyte Composite for Li‐Ion Battery Operation from Room Temperature to 150 °C |
| |
| Authors: | Marco‐Tulio F. Rodrigues Kaushik Kalaga Hemtej Gullapalli Ganguli Babu Arava Leela Mohana Reddy Pulickel M. Ajayan |
| |
| Affiliation: | 1. Department of Material Science and NanoEngineering, Rice University, Houston, TX, USA;2. Department of Mechanical Engineering, Wayne State University, Detroit, MI, USA |
| |
| Abstract: | Batteries for high temperature applications capable of withstanding over 60 °C are still dominated by primary cells. Conventional rechargeable energy storage technologies which have exceptional performance at ambient temperatures employ volatile electrolytes and soft separators, resulting in catastrophic failure under heat. A composite electrolyte/separator is reported that holds the key to extend the capability of Li‐ion batteries to high temperatures. A stoichiometric mixture of hexagonal boron nitride, piperidinium‐based ionic liquid, and a lithium salt is formulated, with ionic conductivity reaching 3 mS cm?1, electrochemical stability up to 5 V and extended thermal stability. The composite is used in combination with conventional electrodes and demonstrates to be stable for over 600 cycles at 120 °C, with a total capacity fade of less than 3%. The ease of formulation along with superior thermal and electrochemical stability of this system extends the use of Li‐ion chemistries to applications beyond consumer electronics and electric vehicles. |
| |
| Keywords: | boron nitride energy storage high‐temperature electrolytes ionic liquids lithium‐ion batteries |
|
|
