Metal Oxide Interlayer for Long-Lived Lithium-Selenium Batteries

Mukkabla, Radha and Kuldeep, Kuldeep and Killi, Krushnamurty and Sonnada Math, Shivaprasad and M, Deepa (2018) Metal Oxide Interlayer for Long-Lived Lithium-Selenium Batteries. Chemistry - A European Journal. ISSN 0947-6539

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Abstract

A Lithium (Li)‐Selenium (Se)‐alkali activated carbon hybrid cell with a tungsten oxide interlayer is implemented for the first time. The Se hybrid at a Se loading of 70% in the full Li‐Se cell, delivers a large reversible capacity of 625 mAh gSe‐1 as opposed to 505.8 mAh gSe‐1 achieved for the pristine Se cell. This clearly shows the advantage of the carbon in improving the capacity of the Li‐Se cell. To further circumvent the issues of polyselenide dissolution and shuttle which cause severe capacity fade, a tungsten oxide interlayer is drop‐cast over the battery separator. While the oxide layer conducts Li‐ions which is evidenced from a Li‐ion diffusion coefficient of 4.2 × 10‐9 cm2 s‐1, it simultaneously blocks the polyselenide cross‐over for it is impermeable to polyselenides, thereby reducing the capacity fade with cycling. The outcome of this unique approach is reflected in the reversible capacities of 808 and 510 mAh gSe‐1, achieved for the Li‐oxide@separator/Se‐ alkali activated carbon cell before and after 100 cycles, thus demonstrating that carbon and oxide can efficiently restrict the capacity fade and improve the performances of Li‐Se cells.

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