A novel phenylethynyl-containing conjugative organodisulfide compound 9-trimethylsilane ethynyl-5,8-dihydro-lH,4H-2,3,6,7-tetrathia-anthracene (TMSEDTTA) was synthesized by a facile preparation method, characterized by elemental analysis, Fourier transform infrared spectroscopy (FT-IR), Raman spectrum, X-ray photoelectron spectroscopy (XPS), and thermogravimetric analysis (TGA), and was tested as cathode active material in rechargeable lithium batteries. The electrochemical properties of S–S bonds redox behavior in the organodisulfides were investigated in 1.0 M LiClO4/EC/DMC (1:1, v/v) solution. The system has many advantages, such as high theoretical charge density (ca. 365 mAh g−1), fast redox process and enhanced reversibility. The fast redox process and enhanced reversibility are due to the intramolecular cleavage-recombination of the S–S bond, and the intramolecular electrocatalytic effect of phenylethynyl chain. The cyclic voltammogram of TMSEDTTA shows multiple redox peaks. The separation of the anodic and cathodic peak potentials for disulfide bond in TMSEDTTA is 0.4 V. The charge–discharge tests show an initial capacity of 330 mAh g−1 and the coulomb efficiency of more than 80 % after the electrochemical activation.

中文翻译：

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新型含苯乙炔基有机二硫化物锂二次电池正极材料的合成及性能

采用简便的制备方法合成了一种新型的含苯乙炔基共轭有机二硫化物9-三甲基硅烷乙炔基-5,8-二氢-1H,4H-2,3,6,7-四硫杂蒽(TMSEDTTA)，并通过元素分析对其进行了表征，傅里叶变换红外光谱 (FT-IR)、拉曼光谱、X 射线光电子能谱 (XPS) 和热重分析 (TGA)，并作为可充电锂电池的正极活性材料进行测试。在 1.0 M LiClO4/EC/DMC (1:1, v/v) 溶液中研究了有机二硫化物中 S-S 键氧化还原行为的电化学性质。该系统具有许多优点，例如高理论电荷密度（约 365 mAh g-1）、快速氧化还原过程和增强的可逆性。快速氧化还原过程和增强的可逆性是由于 S-S 键的分子内裂解-重组以及苯乙炔链的分子内电催化作用。TMSEDTTA 的循环伏安图显示出多个氧化还原峰。TMSEDTTA 中二硫键的阳极和阴极峰电位的分离为 0.4 V。充放电测试显示初始容量为 330 mAh g-1，电化学活化后库仑效率超过 80%。