|Title||Self-discharge of lithium–sulfur cells using stainless-steel current-collectors|
|Publication Type||Journal Article|
|Year of Publication||2005|
|Authors||Ho-Suk Ryu, Hyo-Jun Ahn, Ki-Won Kim, Jou-Hyeon Ahn, Jeong Yong Lee, Elton J Cairns|
|Journal||Journal of Power Sources|
|Keywords||Current-collector, Li–S cell, Open-circuit voltage, Self-discharge, Stainless steel|
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.
|Short Title||Journal of Power Sources|