کد مقاله کد نشریه سال انتشار مقاله انگلیسی نسخه تمام متن
179171 459338 2014 4 صفحه PDF دانلود رایگان
عنوان انگلیسی مقاله ISI
A gradient porous cathode for non-aqueous lithium-air batteries leading to a high capacity
ترجمه فارسی عنوان
یک کاتد متخلخل گرادیان برای باتری های لیتیوم بدون آب که منجر به ظرفیت بالا می شود
کلمات کلیدی
باتری باتری لیتیوم، ظرفیت تخلیه، توزیع نمک گرادیان، حمل اکسیژن
موضوعات مرتبط
مهندسی و علوم پایه مهندسی شیمی مهندسی شیمی (عمومی)
چکیده انگلیسی


• A cathode with a stepwise gradient pore distribution is designed and fabricated.
• The new electrode enables a substantial increase in the discharge capacity.
• The increased capacity can be mainly attributed to the improved oxygen transport.

In conventional porous cathodes of non-aqueous lithium-air batteries, the higher discharge reaction rate in the oxygen richer region will result in a gradient distribution of the solid product, Li2O2, decreasing from the air side to the separator side. Such a distribution of the solid product means that although the pores toward the separator side remain open, the pores at the air side will be blocked first with an increase in the discharge capacity, terminating the discharge process and resulting in a low discharge capacity. In this work, we design and fabricate a cathode structure with a stepwise gradient pore distribution (pore size reducing from 500 to 300 and 100 nm) by mixing carbon powder and nanotubes. The gradient porous cathode enables the capacity of a non-aqueous lithium-air battery discharging at 0.1 mA/cm2 to be 19.2% higher than that by a uniform porous cathode (~ 100 nm in pore size) and 82.3% higher than that by a uniform porous cathode (~ 500 nm in pore size). The SEM image analysis suggests that the increased discharge capacity can be mainly attributed to the fact that the gradient cathode can not only increase oxygen transport pathways but also retain a sufficiently large specific surface area.

ناشر
Database: Elsevier - ScienceDirect (ساینس دایرکت)
Journal: Electrochemistry Communications - Volume 46, September 2014, Pages 111–114
نویسندگان
, , , , ,