کد مقاله کد نشریه سال انتشار مقاله انگلیسی نسخه تمام متن
185298 459594 2014 8 صفحه PDF دانلود رایگان
عنوان انگلیسی مقاله ISI
Improving high voltage stability of lithium cobalt oxide/graphite battery via forming protective films simultaneously on anode and cathode by using electrolyte additive
ترجمه فارسی عنوان
بهبود پایداری ولتاژ بالا از باتری لیتیوم کبالت / اکسید گرافیت از طریق ایجاد فیلم های محافظ به طور همزمان بر روی آند و کاتد با استفاده از افزودنی الکترولیت
کلمات کلیدی
باتری یون لیتیوم، اکسید کبالت لیتیم، گرافیت، کربنات وینیل اتیلن، رابط الکترولیت جامد
موضوعات مرتبط
مهندسی و علوم پایه مهندسی شیمی مهندسی شیمی (عمومی)
چکیده انگلیسی


• The cyclic stability of LiCoO2/graphite battery in voltage range of 3.0-4.5 V is improved by VEC.
• VEC inhibits dimension change of the battery after cycling at 4.5 V cutoff voltage.
• The SEI formed by VEC on cathode is able to inhibit the cobalt dissolution.
• The anodic SEI formed by VEC suppresses the cobalt deposition and the electrolyte decomposition.

We report a new finding that high voltage stability of lithium cobalt oxide (LiCoO2)/graphite battery can be improved by using vinyl ethylene carbonate (VEC) as an electrolyte additive. Charge/discharge tests demonstrate that the battery using VEC exhibits significantly improved cyclic and dimensional stability of the 053048-type LiCoO2/graphite pouch cell up to 4.5 V. The capacity retention is 87.0% and the swell value in thickness is 3.1% for the cell with 2.0 wt.% VEC after 400 cycles between 3.0 V and 4.5 V, compared to the values of 38.4% and 38.6%, respectively, for the cell without additive. The characterizations from scanning electron spectroscopy and X-ray photoelectron spectroscopy demonstrate that VEC facilitates the formation of stable solid electrolyte interfaces simultaneously on anode and cathode of the LiCoO2/graphite battery, yielding effective protections for anode and cathode and preventions of the electrolyte decomposition on both electrodes.

ناشر
Database: Elsevier - ScienceDirect (ساینس دایرکت)
Journal: Electrochimica Acta - Volume 141, 20 September 2014, Pages 263–270
نویسندگان
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