X-ray absorption near edge structure analysis of the charge-discharge mechanisms of dithiobiuret polymer used as a high-capacity cathode material for lithium-ion batteries
X-ray absorption near edge structure analysis of the charge-discharge mechanisms of dithiobiuret polymer used as a high-capacity cathode material for lithium-ion batteries
复制标题
X射线吸收近边结构分析二硫代缩二脲聚合物作为锂离子电池高容量正极材料的充放电机理
DOI：
10.1016/j.electacta.2018.05.137
复制
发表时间：
2018
影响因子：
6.6
通讯作者：
A. Fujiwara
中科院分区：
文献类型：
--
作者：
H. Uemachi;Y. Tamenori;T. Itono;T. Masuda;T. Shimoda;A. Fujiwara
我们研究了低分子量二硫代缩二脲（DTB）化合物在还原和氧化状态下的电子结构，沿着的DTB聚合物在放电和充电状态下使用X射线吸收近边结构（XANES）测量。DTB是一种结构简单、重量轻的有机硫分子，具有两个相邻的互变异构的巯基（-SH/> C双键），可通过可逆的氧化环化反应形成二硫键（S-S）。由交替的DTB和亚苯基（Ph）单元组成的DTB聚合物表现出高容量（约260 mA h g-1），而在充电和放电循环特性中没有任何显著的劣化。基于XANES测量，充放电实验，和量子化学计算，我们提出，两种类型的氧化还原对的反应有助于DTB聚合物的氧化还原反应。
We investigated the electronic structures of low-molecular-weight dithiobiuret (DTB) compounds in both reduced and oxidized states along with those of a DTB polymer in the discharged and charged states using X-ray absorption near edge structure (XANES) measurements. DTB is a simple and lightweight organosulfur molecule with two neighboring tautomeric thiol/thione groups (–SH/>Cdouble bondS) that can form disulfide (S–S) bonds by reversible oxidative cyclization. The DTB polymer, composed of alternating DTB and phenylene (Ph) units, exhibited a high capacity (about 260 mA h g−1) without any significant degradation in the charge and discharge cycle characteristics. Based on XANES measurements, charge–discharge experiments, and quantum chemical calculations, we propose that the reactions of two types of redox couples contribute the redox reaction of the DTB polymer.