科学家在高性能钠离子电池正极材料研发方面取得新进展

Core Insights - The research team from the Hefei Institute of Physical Science has made significant advancements in the development of sodium-ion battery cathode materials, specifically sodium vanadium manganese phosphate (Na4MnV(PO4)3, NMVP), enhancing sodium ion transport and cycle stability through a multi-scale modification strategy [1][3] Group 1: Research Achievements - The NMVP material is promising due to its three-dimensional open framework, high operating voltage, and good structural stability, although it faces challenges such as low intrinsic electronic conductivity and Jahn-Teller distortion during charge-discharge cycles [1][3] - The team introduced high-valence, small-radius Mo6+ ions at the vanadium sites to enhance the Mn-O bond strength and suppress Jahn-Teller distortion, while also reducing the bandgap to improve electronic conductivity [3] Group 2: Performance Metrics - The modified Na3.91MnV0.97Mo0.03(PO4)3@Al2O3 (NMVMP@Al2O3) achieved an initial discharge capacity of 99.3 mAhg-1 at a rate of 0.1 C, maintaining a capacity retention of 84.5% after 3000 cycles at a high rate of 10 C, significantly outperforming unmodified materials and other reported NASICON-type cathodes [3] - The volume change during charge-discharge processes for the modified material was only 3.66%, indicating high structural reversibility and stability [3]