Details

Autor(en) / Beteiligte

• Zhang, Xi
• Liu, Xiaohong
• Zhang, Wei
• Song, Yingze

Titel

Tunable vacancy defect chemistry on free-standing carbon cathode for lithium-sulfur batteries

Ist Teil von

• Green energy & environment, 2023-04, Vol.8 (2), p.354-359

Ort / Verlag

Elsevier B.V

Erscheinungsjahr

2023

Quelle

Alma/SFX Local Collection

Beschreibungen/Notizen

• The defect chemistry is successfully modulated on free-standing and binder-free carbon cathodes for highly efficient Li–S redox reactions. Such rationally regulated defect engineering realizes the synchronization of ion/electron-conductive and defect-rich networks on the three-dimension carbon cathode, leading to its tunable activity for both relieving the shuttle phenomenon and accelerating the sulfur redox reaction kinetics. As expected, the defective carbon cathode harvests a high rate capacity of 1217.8 mAh g−1 at 0.2 C and a superior capacity retention of 61.7% at 2 C after 500 cycles. Even under the sulfur mass loading of 11.1 mg cm−2, the defective cathode still holds a remarkable areal capacity of 8.5 mAh cm−2. The defect engineering-enabled carbon cathode realizes not only the synergy of monovacancies and divacancies but also the tailor of defect density, leading to 3D electrocatalytic networks for Li–S redox reactions. [Display omitted] •Realizing the density tuning of defects in 3D carbon cathode for Li–S chemistry.•Designing the highly active electrocatalytic network for Li–S chemistry.•Attaining advanced Li–S batteries toward practically viable application.