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Experimental study on flammability limits of electrolyte solvents in lithium-ion batteries using a wick combustion method
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| Title: | Experimental study on flammability limits of electrolyte solvents in lithium-ion batteries using a wick combustion method |
| Authors: | Guo, Feng Browse this author | | Hase, Wataru Browse this author | | Ozaki, Yu Browse this author | | Konno, Yusuke Browse this author | | Inatsuki, Masaya Browse this author | | Nishimura, Katsunori Browse this author | | Hashimoto, Nozomu Browse this author | | Fujita, Osamu Browse this author →KAKEN DB |
| Keywords: | Flammability limit | | Wick combustion | | Electrolyte solvent | | Lithium-ion battery | | Organophosphorus compound | | Flame-retardant |
| Issue Date: | Dec-2019 |
| Publisher: | Elsevier |
| Journal Title: | Experimental thermal and fluid science |
| Volume: | 109 |
| Start Page: | UNSP 109858 |
| Publisher DOI: | 10.1016/j.expthermflusci.2019.109858 |
| Abstract: | To quantify the flammability limits of organic electrolyte solvents used in lithium-ion batteries, a unique wick combustion system was developed in conjunction with limiting oxygen concentration (LOC) of candle-like flame, named wick-LOC method. By controlling the oxygen-nitrogen ratio of external flow of the wick diffusion flame, the flammability limits (LOC) of electrolyte solvents were determined experimentally. To provide reproducible results under specified conditions, the effects of axial flow velocity, exposed wick length and elapsed time after ignition on the wick-LOC were studied, and the proper experimental conditions were selected for further applications. To validate the reliability of wick-LOC in flammability evaluation, correlation analyses to other flammability properties (flash point, auto-ignition temperature, the heat of combustion and other types of LOC) were conducted. The wick-LOC method was then applied to quantify the flammability of mixed solvents. The linear changes of wick-LOC with mixing ratios were found in the mixture of linear and cyclic carbonates, while the non-linear trends were found in carbonate-ether mixed solvents. To evaluate the flame-retardant effectiveness of organophosphorus compounds (OPCs) as additives in electrolyte solvents, a series of tests were conducted. Results showed that small amounts of OPCs had significant flame-retardant effects, but the efficiency decreased with the higher OPC additions. The effectiveness of four OPCs was distinguished as well. The results of this work provided valuable information about the flammability limits of single and mixed electrolyte solvents, and it may be useful for designing electrolyte balanced in both performance and safety. |
| Rights: | © 2019. This manuscript version is made available under the CC-BY-NC-ND 4.0 license http://creativecommons.org/licenses/by-nc-nd/4.0/ | | http://creativecommons.org/licenses/by-nc-nd/4.0/ |
| Type: | article (author version) |
| URI: | http://hdl.handle.net/2115/83364 |
| Appears in Collections: | 工学院・工学研究院 (Graduate School of Engineering / Faculty of Engineering) > 雑誌発表論文等 (Peer-reviewed Journal Articles, etc)
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Submitter: 藤田 修
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