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Polarity-induced precipitation of S/Li2S confined into N and S co-doped porous graphene layered matrix for lithium sulfur batteries
- Source :
- Carbon. 184:544-553
- Publication Year :
- 2021
- Publisher :
- Elsevier BV, 2021.
-
Abstract
- The large-scale application of lithium sulfur batteries is impeded by their cycling stability and power performance mainly due to the polysulfide shuttle effect and low conductivity of sulfur. Herein, a multifunctional sulfur host of N/S co-doped porous graphene layered matrix (NSPG) is fabricated. High specific surface area of NSPG can guarantee the homogeneous deposition and high utilization of S/Li2S. Moreover, the layered graphene skeleton with abundant crumples can not only construct efficient channels for fast electrolyte ion/electron transfer but also effectively buffer the volume expansion of S during long-time charge/discharge process. DFT calculations verify that the N/S co-doping can promote the redox reaction rate and inhibit the polysulfides shuttle effect through chemical bonding interaction. Benefiting from the above synergistic effects, the NSPG/S electrode exhibits excellent rate performance (646 mAh g−1 at 10C) and outstanding cycle stability (693 mAh g−1 after 500 cycles). Even at a high mass loading of 4.5 mg cm−2, a capacity of 786 mAh g−1 can be retained after 100 cycles. This work might offer a feasible solution for developing sulfur host with multifunctionality and electrocatalytic activity for high-performance lithium sulfur batteries.
Details
- ISSN :
- 00086223
- Volume :
- 184
- Database :
- OpenAIRE
- Journal :
- Carbon
- Accession number :
- edsair.doi...........d120d220000b034e0050a9d072a9bee6