Solid-state graft copolymer electrolytes for lithium battery applications
Battery safety has been a very important research area over the past decade. Commercially available lithium ion batteries employ low flash point ( < 80 °C), flammable, and volatile organic electrolytes. These organic based electrolyte systems are viable at ambient temperatures, but require a coo...
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MyJoVE Corporation
2017
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| Online Access: | http://hdl.handle.net/1721.1/111850 https://orcid.org/0000-0003-1978-8654 |
| _version_ | 1826192134944849920 |
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| author | Hu, Qichao Caputo, Antonio Sadoway, Donald Robert |
| author2 | Massachusetts Institute of Technology. Materials Processing Center |
| author_facet | Massachusetts Institute of Technology. Materials Processing Center Hu, Qichao Caputo, Antonio Sadoway, Donald Robert |
| author_sort | Hu, Qichao |
| collection | MIT |
| description | Battery safety has been a very important research area over the past decade. Commercially available lithium ion batteries employ low flash point ( < 80 °C), flammable, and volatile organic electrolytes. These organic based electrolyte systems are viable at ambient temperatures, but require a cooling system to ensure that temperatures do not exceed 80 °C. These cooling systems tend to increase battery costs and can malfunction which can lead to battery malfunction and explosions, thus endangering human life. Increases in petroleum prices lead to a huge demand for safe, electric hybrid vehicles that are more economically viable to operate as oil prices continue to rise. Existing organic based electrolytes used in lithium ion batteries are not applicable to high temperature automotive applications. A safer alternative to organic electrolytes is solid polymer electrolytes. This work will highlight the synthesis for a graft copolymer electrolyte (GCE) poly(oxyethylene) methacrylate (POEM) to a block with a lower glass transition temperature (Tg) poly(oxyethylene) acrylate (POEA). The conduction mechanism has been discussed and it has been demonstrated the relationship between polymer segmental motion and ionic conductivity indeed has a Vogel-Tammann-Fulcher (VTF) dependence. Batteries containing commercially available LP30 organic (LiPF6 in ethylene carbonate (EC):dimethyl carbonate (DMC) at a 1:1 ratio) and GCE were cycled at ambient temperature. It was found that at ambient temperature, the batteries containing GCE showed a greater overpotential when compared to LP30 electrolyte. However at temperatures greater than 60 °C, the GCE cell exhibited much lower overpotential due to fast polymer electrolyte conductivity and nearly the full theoretical specific capacity of 170 mAh/g was accessed. |
| first_indexed | 2024-09-23T09:06:28Z |
| format | Article |
| id | mit-1721.1/111850 |
| institution | Massachusetts Institute of Technology |
| last_indexed | 2024-09-23T09:06:28Z |
| publishDate | 2017 |
| publisher | MyJoVE Corporation |
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| spelling | mit-1721.1/1118502022-09-30T13:29:55Z Solid-state graft copolymer electrolytes for lithium battery applications Hu, Qichao Caputo, Antonio Sadoway, Donald Robert Massachusetts Institute of Technology. Materials Processing Center Massachusetts Institute of Technology. Department of Materials Science and Engineering Hu, Qichao Caputo, Antonio Sadoway, Donald Robert Battery safety has been a very important research area over the past decade. Commercially available lithium ion batteries employ low flash point ( < 80 °C), flammable, and volatile organic electrolytes. These organic based electrolyte systems are viable at ambient temperatures, but require a cooling system to ensure that temperatures do not exceed 80 °C. These cooling systems tend to increase battery costs and can malfunction which can lead to battery malfunction and explosions, thus endangering human life. Increases in petroleum prices lead to a huge demand for safe, electric hybrid vehicles that are more economically viable to operate as oil prices continue to rise. Existing organic based electrolytes used in lithium ion batteries are not applicable to high temperature automotive applications. A safer alternative to organic electrolytes is solid polymer electrolytes. This work will highlight the synthesis for a graft copolymer electrolyte (GCE) poly(oxyethylene) methacrylate (POEM) to a block with a lower glass transition temperature (Tg) poly(oxyethylene) acrylate (POEA). The conduction mechanism has been discussed and it has been demonstrated the relationship between polymer segmental motion and ionic conductivity indeed has a Vogel-Tammann-Fulcher (VTF) dependence. Batteries containing commercially available LP30 organic (LiPF6 in ethylene carbonate (EC):dimethyl carbonate (DMC) at a 1:1 ratio) and GCE were cycled at ambient temperature. It was found that at ambient temperature, the batteries containing GCE showed a greater overpotential when compared to LP30 electrolyte. However at temperatures greater than 60 °C, the GCE cell exhibited much lower overpotential due to fast polymer electrolyte conductivity and nearly the full theoretical specific capacity of 170 mAh/g was accessed. 2017-10-13T21:27:17Z 2017-10-13T21:27:17Z 2013-08 2017-10-11T22:38:37Z Article http://purl.org/eprint/type/JournalArticle 1940-087X http://hdl.handle.net/1721.1/111850 Hu, Qichao et al. "Solid-state graft copolymer electrolytes for lithium battery applications." Journal of Visualized Experiments 78 (August 2013): e50067 © 2013 Journal of Visualized Experiments https://orcid.org/0000-0003-1978-8654 http://dx.doi.org/10.3791/50067 Journal of Visualized Experiments Article is made available in accordance with the publisher's policy and may be subject to US copyright law. Please refer to the publisher's site for terms of use. application/pdf MyJoVE Corporation |
| spellingShingle | Hu, Qichao Caputo, Antonio Sadoway, Donald Robert Solid-state graft copolymer electrolytes for lithium battery applications |
| title | Solid-state graft copolymer electrolytes for lithium battery applications |
| title_full | Solid-state graft copolymer electrolytes for lithium battery applications |
| title_fullStr | Solid-state graft copolymer electrolytes for lithium battery applications |
| title_full_unstemmed | Solid-state graft copolymer electrolytes for lithium battery applications |
| title_short | Solid-state graft copolymer electrolytes for lithium battery applications |
| title_sort | solid state graft copolymer electrolytes for lithium battery applications |
| url | http://hdl.handle.net/1721.1/111850 https://orcid.org/0000-0003-1978-8654 |
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