氧化还原
材料科学
阴极
插层(化学)
焓
氧化物
钠
离子
无机化学
物理化学
化学
热力学
物理
有机化学
冶金
作者
Duho Kim,Maenghyo Cho,Kyeongjae Cho
标识
DOI:10.1002/adma.201701788
摘要
In an effort to develop high-energy-density cathodes for sodium-ion batteries (SIBs), low-cost, high capacity Na(Li1/3 Mn2/3 )O2 is discovered, which utilizes the labile O 2p-electron for charge compensation during the intercalation process, inspired by Li2 MnO3 redox reactions. Na(Li1/3 Mn2/3 )O2 is systematically designed by first-principles calculations considering the Li/Na mixing enthalpy based on the site preference of Na in the Li sites of Li2 MnO3 . Using the anionic redox reaction (O2- /O- ), this Mn-oxide is predicted to show high redox potentials (≈4.2 V vs Na/Na+ ) with high charge capacity (190 mAh g-1 ). Predicted cathode performance is validated by experimental synthesis, characterization, and cyclic performance studies. Through a fundamental understanding of the redox reaction mechanism in Li2 MnO3 , Na(Li1/3 Mn2/3 )O2 is designed as an example of a new class of promising cathode materials, Na(Li1/3 M2/3 )O2 (M: transition metals featuring stabilized M4+ ), for further advances in SIBs.
科研通智能强力驱动
Strongly Powered by AbleSci AI