Wang, Dan-Yang; Si, Yubing; Guo, Wei; Fu, Yongzhu published the artcile< Long Cycle Life Organic Polysulfide Catholyte for Rechargeable Lithium Batteries>, SDS of cas: 2127-03-9, the main research area is rechargeable lithium battery organic polysulfide catholyte; dipyridyl polysulfide; lithium batteries; molecular dynamic simulations; organosulfide; ultra performance liquid chromatographyquadrupole time‐of‐flight‐mass spectrometry (UPLC‐QTof‐MS).
Herein, a spectrum of dipyridyl polysulfides (Py2Sx, 3 ≤ x ≤ 8) is prepared in electrolyte by a one-pot synthesis method from dipyridyl disulfide (Py2S2) and elemental sulfur. It renders up to seven dipyridyl polysulfides (i.e., Py2S3, Py2S4, Py2S5, Py2S6, Py2S7, and Py2S8) which show fully reversible electrochem. behavior in lithium batteries. In the discharge, the initial lithiation occurs at 2.45 V leading to the breakage of Sα-Sβ bonds in Py2Sx and formation of lithium 2-pyridinethiolate, in which lithium is coordinated in between N and S atoms. The left sulfur species act as elemental sulfur, showing two voltage plateaus at 2.3 and 2.1 V. The mol. dynamics simulations show the attraction between pyridyl groups and lithium polysulfides/sulfide via N···Li···S bonds, which enable good retention of soluble discharge products within electrodes and stable cycling performance. In the recharge, low-order Py2Sx (e.g., Py2S3, Py2S4, and Py2S5) remain as the charged products. The mixture catholyte exhibits superlong cycle life at 1C rate with 1200 cycles and 70.5% capacity retention.
Advanced Science (Weinheim, Germany) published new progress about Aqueous solutions, electrolyzed water. 2127-03-9 belongs to class pyridine-derivatives, and the molecular formula is C10H8N2S2, SDS of cas: 2127-03-9.