Study On The Solvthermal Synthesis And Properties Of Sb₂S₃-based Materials

Lithium-ion batteries have been rapidly developped and widely applied in viewof its unique properties. Currently, the graphite anode has a relatively low theoreticalspecific capacity (372mAh g-1), thereby restricting its future applications forpowering electric vehicles (EVs) of large capacity and high power. As a result, lots ofresearching activities have been performed for evaluating various alternative anodematerials with improved performance in the last decade. Sb2S3is an attractive anodematerial for LIBs due to the higher theoretical capacity, low cost, and environmentalbenignity. However, they generally suffer from poor cycle behavior since a largevolume change occurs during the charge/discharge process. In this report, we aimed todesign a nanocomposite anode having excellent electrochemical properties. We usesulfur-containing amino acids and RGO to modify the Sb2S3material to improve theinitial coulombic efficiency, capacity and cycle stability. The electrochemicalperformance of the synthesised Sb2S3nanorod-bundles was investigated by cyclicvoltammetry and galvanostatic charge-discharge technique, respectively. And we canconclude the following conclusions:1、 Sb2S3materials were synthesized successfully by a facile ethanolsolvothermal treatment under different conditions: different sulfur sources, differentreaction temperatures and times. The results show that different sulfur sources havegreat influence on the electrochemical performance of the Sb2S3materials. The Sb2S3materials synthesized with L-cysteine hydrochloride as sulfur sources was found todisplay the highest lithiation and delithiation specific capacity during the first cycle,1043.5/1235.5mAh g-1, with the initial coulombic efficiency of84.5%, reversibledischarge capacity is536mAh g-1after30cycles at a current density of100mA g-1when evaluated as an electrode candidate material for lithium-ion batteries.2、 The amount of the NH4+have great influence on the electrochemicalperformance of the Sb2S3materials. The Sb2S3materials washed with absolute ethyl alcohol for two times was found to display the highest lithiation and delithiationspecific capacity during the first cycle,1043.5/1235.5mAh g-1, with the initialcoulombic efficiency of84.5%at a current density of100mA g-1when evaluated asan electrode candidate material for lithium-ion batteries.3、The XPS test results and the electrochemical performance show that theexistence of organic S0is helpful for the improvement of the Sb2S3material’selectrochemical performance;4、Sb2S3/RGO nanocomposites were synthesized successfully by a facile ethanolsolvothermal treatment with different GO contents. The electrochemical performanceshow that the existence of RGO is helpful for the improvement of the Sb2S3material’scycle stability. In conclusion, Sb2S3based composite is a potentially lithium ionbattery electrode materials with high capacity.