TY - JOUR KW - Self-discharge KW - Current-collector KW - Li–S cell KW - Open-circuit voltage KW - Stainless steel AU - Ho-Suk Ryu AU - Hyo-Jun Ahn AU - Ki-Won Kim AU - Jou-Hyeon Ahn AU - Jeong Yong Lee AU - Elton J Cairns AB -

The self-discharge behaviour of Li–S cell, is investigated through changes in the open-circuit voltage (OCV) and discharge capacity with storage time. A fresh Li–S cell experiences 72% sulfur utilization during the first discharge, as based on the theoretical capacity for the formation of Li2S. After 30 days of storage, the OCV has fallen from 2.48 to 2.16 V and the discharge capacity has decreased from 1206 to 924 mAh g−1 (based on sulfur). Analysis of the self-discharged sample by a variety of techniques shows the formation of lithium polysulfides, such as Li2Sn (n ≥ 1) from the reaction of lithium and sulfur, which is related to the corrosion of the stainless current-collector. Stainless steel is not the most appropriate current-collector material for Li–S cells. The extent of self-discharge can be decreased by using a gold-coated current-collector that offers protection against corrosion.

BT - Journal of Power Sources DA - 02/2005 DO - 10.1016/j.jpowsour.2004.08.039 IS - 2 N2 -

The self-discharge behaviour of Li–S cell, is investigated through changes in the open-circuit voltage (OCV) and discharge capacity with storage time. A fresh Li–S cell experiences 72% sulfur utilization during the first discharge, as based on the theoretical capacity for the formation of Li2S. After 30 days of storage, the OCV has fallen from 2.48 to 2.16 V and the discharge capacity has decreased from 1206 to 924 mAh g−1 (based on sulfur). Analysis of the self-discharged sample by a variety of techniques shows the formation of lithium polysulfides, such as Li2Sn (n ≥ 1) from the reaction of lithium and sulfur, which is related to the corrosion of the stainless current-collector. Stainless steel is not the most appropriate current-collector material for Li–S cells. The extent of self-discharge can be decreased by using a gold-coated current-collector that offers protection against corrosion.

PY - 2005 SP - 365 EP - 369 ST - Journal of Power Sources T2 - Journal of Power Sources TI - Self-discharge of lithium–sulfur cells using stainless-steel current-collectors VL - 140 SN - 03787753 ER -