Nitrogen Balance on Ni-N-C Promotor for High-Energy Lithium-Sulfur Pouch Cells.
Xuan CaoMenglei WangYuanli LiLe ChenLixian SongWenlong CaiWei ZhangYingze SongPublished in: Advanced science (Weinheim, Baden-Wurttemberg, Germany) (2022)
The viability of lithium-sulfur (Li-S) batteries toward real implementation directly correlates with unlocking lithium polysulfide (LiPS) evolution reactions. Along this line, designing promotors with the function of synchronously relieving LiPS shuttle and promoting sulfur conversion is critical. Herein, the nitrogen evolution on hierarchical and atomistic Ni-N-C electrocatalyst, mainly pertaining to the essential subtraction, reservation and coordination of nitrogen atoms, is manipulated to attain favorable Li-S pouch cell performances. Such rational evolution behavior realizes the "nitrogen balance" in simultaneously regulating the Ni-N coordination environment, Ni single atom loading, abundant vacancy defects, active nitrogen and electron conductivity, and maximizing the electrocatalytic activity elevation of Ni-N-C system. With such merit, the cathode harvests favorable performances in a soft-packaged pouch cell prototype even under high sulfur mass loading and lean electrolyte usage. A specific energy density up to 405.1 Wh kg -1 is harvested by the 0.5-Ah-level pouch cell.
Keyphrases
- solid state
- metal organic framework
- cell therapy
- ion batteries
- primary care
- healthcare
- stem cells
- induced apoptosis
- transition metal
- reduced graphene oxide
- magnetic resonance imaging
- signaling pathway
- oxidative stress
- molecular dynamics simulations
- postmenopausal women
- quality improvement
- bone mineral density
- solar cells
- cell death
- electron microscopy