Rechargeable lithium sulfur battery - I. Structural change of sulfur cathode during discharge and charge
Rechargeable lithium sulfur battery - I. Structural change of sulfur cathode during discharge and charge
复制标题
DOI：
10.1149/1.1571532
复制
发表时间：
2003-06-01
影响因子：
3.9
通讯作者：
Kim, HT
中科院分区：
文献类型：
--
作者：
Cheon, SE;Ko, KS;Kim, HT
本文通过扫描电子显微镜（SEM）、X射线衍射（XRD）和波色散光谱（WDS）研究了采用0.5 M LiCF3SO3-四（乙二醇）二甲醚（TEGDME）的锂硫电池电化学反应过程中硫正极的结构变化。锂硫电池的放电过程可分为第一放电区（2.4-2.1 V）和第二放电区（2.1-1.5 V），其中元素硫还原形成可溶性多硫化物并进一步还原可溶性多硫化物，第二放电区（2.1-1.5 V）可溶性多硫化物被还原形成覆盖在碳基体上的不均匀的Li2S固体膜。研究还发现，锂硫电池的充电导致Li2S转化为可溶性多硫化物，导致碳基体上形成的Li2S层被去除。然而，可溶性多硫化物几乎不会氧化成固体硫，即使在 100% 的充电深度下，碳基体上也几乎没有留下 Li2S。 (C) 2003 年电化学协会。
In this paper, the structural change of the sulfur cathode during the electrochemical reaction of a lithium sulfur battery employing 0.5 M LiCF3SO3-tetra(ethylene glycol) dimethyl ether (TEGDME) was studied by means of scanning electron microscopy (SEM), X-ray diffraction (XRD), and wave dispersive spectroscopy (WDS). The discharge process of the lithium sulfur cell could be divided in the first discharge region (2.4- 2.1 V) where the reduction of elemental sulfur to form soluble polysulfides and further reduction of the soluble polysulfide occur, and the second discharge region (2.1-1.5V) where the soluble polysulfides are reduced to form a nonuniform Li2S solid film covered over the carbon matrix. It was also found that the charge of lithium sulfur cell leads to the conversion from Li2S to the soluble polysulfide, resulting in the removal of Li2S layer formed on carbon matrix. However, the oxidization of the soluble polysulfide to solid sulfur hardly occurs and few Li2S are left on carbon matrix even at 100% depth of charge. (C) 2003 The Electrochemical Society.