| Title | Building a cycle- stable sulphur cathode by tailoring its redox reaction into a solid- phase conversion mechanism |
| Authors | He, Feng Wu, Xiangjiang Qian, Jiangfeng Cao, Yuliang Yang, Hanxi Ai, Xinping Xia, Dingguo |
| Affiliation | Wuhan Univ, Coll Chem & Mol Sci, Hubei Key Lab Electrochem Power Sources, Wuhan 430072, Peoples R China. Peking Univ, Beijing Key Lab Theory & Technol Adv Batteries Ma, Coll Engn, Beijing 100871, Peoples R China. Wuhan Univ, Coll Chem & Mol Sci, Hubei Key Lab Electrochem Power Sources, Wuhan 430072, Peoples R China. Xia, DG (reprint author), Peking Univ, Beijing Key Lab Theory & Technol Adv Batteries Ma, Coll Engn, Beijing 100871, Peoples R China. |
| Keywords | SPARINGLY SOLVATING ELECTROLYTES POROUS CARBON ELECTROCHEMICAL PERFORMANCE GRAPHENE SHEETS LITHIUM-ION IN-SITU NITROGEN BATTERIES POLYSULFIDE COMPOSITE |
| Issue Date | 2018 |
| Publisher | JOURNAL OF MATERIALS CHEMISTRY A |
| Citation | JOURNAL OF MATERIALS CHEMISTRY A. 2018, 6(46), 23396-23407. |
| Abstract | Sulphur has been actively investigated as a high capacity, naturally abundant and low cost cathode for next generation rechargeable lithium batteries. However, the poor cyclability and low capacity utilization of sulphur materials remain a great challenge for battery applications. To overcome this problem, we proposed a new strategy to convert the redox chemistry of sulphur cathodes from the dissolution-deposition mechanism to a solid-phase conversion (SPC) reaction by in situ formation of a thin and compact solid electrolyte interface (SEI) on the sulphur surface through a prompt nucleophilic reaction of soluble polysulfide intermediates with carbonate molecules specially designed as a co-solvent in the electrolyte. The such-formed SEI film can effectively block the penetration of the electrolyte but allows Li+ transport for electrochemical conversion, thus completely suppressing the generation and dissolution of polysulfide intermediates without sacrificing the two-electron redox capacity of sulphur. As a result, the S/C cathode in a VC/DME + DOL co-solvent electrolyte demonstrated a stable cycling capacity of approximate to 1100 mA h g(-1) and a high capacity retention of 88% over 400 cycles with a coulombic efficiency of approximate to 100%, showing a prospect for battery application. More significantly, the strategy and method developed in this work may provide a new insight for future development of structurally and electrochemically stable sulphur cathodes for building practically viable Li-S batteries. |
| URI | http://hdl.handle.net/20.500.11897/570770 |
| ISSN | 2050-7488 |
| DOI | 10.1039/c8ta08159j |
| Indexed | SCI(E) |
| Appears in Collections: | 工学院 先进电池材料料理论与技术北京市重点实验室 |
