Publications by authors named "Zhenglei Geng"
Room-temperature sodium-sulfur (RT Na-S) batteries with high energy density and low cost are considered promising next-generation electrochemical energy storage systems. However, their practical feasibility is seriously impeded by the shuttle effect of sodium polysulfide (NaPSs) resulting from the sluggish reaction kinetics. Introducing a suitable catalyst to accelerate conversion of NaPSs is the most used strategy to inhibit the shuttle effect.
View Article and Find Full Text PDFIn-Situ Constructing N,S-Codoped Carbon Heterointerface for High-Rate Cathode of Sodium-Ion Batteries.
ACS Appl Mater Interfaces
November 2024
Article Synopsis
- - NaV(PO) (NVP) is a promising cathode material for sodium-ion batteries, but its poor conductivity limits its performance, prompting research for improvements.
- - The study introduces a simple method to create N/S dual-atom doped carbon coatings that enhance Na mobility and increase conductivity by altering electron distribution and expanding interlayer spacing.
- - The modified NVP@NSC composite achieves a high specific capacity of 90.3 mAh/g at 20 C with 94.4% capacity retention after 8000 cycles, indicating excellent stability and performance for practical battery applications.
Article Synopsis
- The carbon coating strategy is crucial for enhancing the conductivity of polyanionic cathodes, but creating a standardized method for selecting carbon precursors remains difficult due to the complex reactions involved.
- Research reveals that the chemistry of carbon precursor pyrolysis significantly affects the formation and performance of NaV(PO) (NVP) cathodes, highlighting the importance of O/H-containing functional groups for effective bonding and a stable carbon layer.
- Optimal use of carbon dots (CDs) as precursors has been shown to significantly improve the Na migration rate, reversibility, and stability of the NVP cathode, resulting in excellent capacity retention over 10,000 cycles.