کد مقاله کد نشریه سال انتشار مقاله انگلیسی نسخه تمام متن
1283410 1497903 2016 11 صفحه PDF دانلود رایگان
عنوان انگلیسی مقاله ISI
Impact of electrolyte solvent and additive choices on high voltage Li-ion pouch cells
ترجمه فارسی عنوان
تاثیر انتخاب‌های الکترولیت حلال و افزودنی بر سلول های کیسه لیتیوم ـ یون با ولتاژ بالا
کلمات کلیدی
سلول های لیتیوم یون با ولتاژ بالا ؛ سولفولان؛ حلال های فلوئوردار؛ مواد افزودنی الکترولیت؛ پوشش LaPO4؛ چرخه با درجه حرارت بالا
موضوعات مرتبط
مهندسی و علوم پایه شیمی الکتروشیمی
چکیده انگلیسی


• A LaPO4-coating showed benefits above 4.5 V but not at 4.3 V or 4.4 V.
• LaPO4-coated NMC442/graphite cells containing TAP performed best at 4.5 V.
• Uncoated NMC442/graphite cells with FEC:TFEC performed best at 4.5 V.

The effects that various electrolyte solvents and electrolyte additives had on both LaPO4-coated LiNi0.4Mn0.4Co0.2O2 and uncoated LiNi0.4Mn0.4Co0.2O2/graphite pouch cells were studied using automated storage, electrochemical impedance spectroscopy, gas production and long-term cycling experiments. Storage experiments showed that the voltage drop during storage at 4.3 or 4.4 V for both coated and uncoated cells was very similar for the same electrolyte choice. At 4.5 V or above, the LaPO4-coated cells had a significantly smaller voltage drop than the uncoated cells except when fluorinated electrolytes were used. Automated charge discharge cycling/impedance spectroscopy testing of cells held at 4.5 V for 24 h every cycle showed that all cells containing ethylene carbonate:ethyl methyl carbonate electrolyte or sulfolane:ethyl methyl carbonate electrolyte exhibited severe capacity fade. By contrast, cells containing fluorinated electrolytes had the best capacity retention and smallest impedance growth during these aggressive cycling/hold tests. Long-term cycling experiments to 4.5 V confirmed that cells containing fluorinated electrolyte had the best cycling performance in the uncoated LiNi0.4Mn0.4Co0.2O2/graphite cells while cells containing sulfolane:ethyl methyl carbonate electrolyte had the best cycling performance in coated LiNi0.4Mn0.4Co0.2O2/graphite cells.

ناشر
Database: Elsevier - ScienceDirect (ساینس دایرکت)
Journal: Journal of Power Sources - Volume 329, 15 October 2016, Pages 387–397
نویسندگان
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