科研之友
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摘要
Sodium-ion battery is a potential alternative to replace lithium -ion battery, the present main actor in electrical energy storage technologies. A recently discovered cathode material Na2.5FeL1.75(SO4)(3) (NFS) derives not only high energy density with very high voltage generation over 3.8 V, but also high-rate capability of reversible Na insertion as a result of large tunnels in the alluaudite structure. Here we applied high temperature X-ray/neutron diffraction to unveil characteristic structural features related to major Na transport pathways. Thermal activation and nuclear density distribution of Na demonstrate one-dimensional Na diffusion channels parallel to [001] direction in full consistence with computational predictions. This feature would be common for the related (sulfo)alluaudite system, forming emerging functional materials group for electrochemical applications.
- 出版日期2016-4-12
