کد مقاله | کد نشریه | سال انتشار | مقاله انگلیسی | نسخه تمام متن |
---|---|---|---|---|
5150397 | 1498235 | 2017 | 5 صفحه PDF | دانلود رایگان |
عنوان انگلیسی مقاله ISI
Non-crystallizing solvent mixtures and lithium electrolytes for low temperatures
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موضوعات مرتبط
مهندسی و علوم پایه
شیمی
الکتروشیمی
پیش نمایش صفحه اول مقاله
چکیده انگلیسی
A new class of solvent mixture and new liquid electrolytes are reported. New non-crystallizing materials may improve the performance of lithium-ion batteries at extremely low temperatures. Solvents were prepared by mixing EC (ethylene carbonate) with PEG250 (poly(ethylene glycol) dimethyl ether with an average molar mass of 250 g molâ 1). Some of these mixtures show only a glass transition, which takes place at temperatures below â 70 °C. It is possible to prepare such non-crystallizing electrolytes with both the novel imidazolide lithium salt LiTDI (lithium 4,5-dicyano-2-(trifluoromethyl)imidazolide) and the benchmark commercial salt LiPF6 (lithium hexafluorophosphate). Most state-of-the-art electrolytes crystallize at temperatures above â 40 °C. Thus, below this temperature a rapid decrease in conductivity is observed. New solutions show very good thermal and electrochemical properties (for instance: high conductivity, wide range of electrochemical stability window). This type of electrolyte may also reach high conductivity values of around 0.014 mS cmâ 1 at â 60 °C. This new class of electrolyte may be the answer to the numerous present issues with applications below 0 °C, and also gives the possibility of battery storage at low temperature without cell damage.
ناشر
Database: Elsevier - ScienceDirect (ساینس دایرکت)
Journal: Solid State Ionics - Volume 308, 1 October 2017, Pages 22-26
Journal: Solid State Ionics - Volume 308, 1 October 2017, Pages 22-26
نویسندگان
Marta Kasprzyk, Aldona Zalewska, Leszek Niedzicki, Anna Bitner, Marek Marcinek, Wladyslaw Wieczorek,