In-cell dehydration of sodium manganese hexacyanoferrate cathode revealed by solid-state NMR  

作　　者：Zonglin Li Xiaobing Lou Shinuo Kang Dingming Liu Fushan Geng Ming Shen Bingwen Hu 

机构地区：[1]Shanghai Key Laboratory of Magnetic Resonance,School of Physics and Electronic Science,East China Normal University,Shanghai,200241,China [2]School of Physics and Electrical Engineering,Anyang Normal University,Anyang,455000,China

出　　处：《Magnetic Resonance Letters》2025年第1期32-39,共8页磁共振快报(英文)

基　　金：supported by grants from the National Natural Science Foundation of China(No.22272055);Scientific and Technological Project of Henan Province(No.222102240081);Science and Technology Planning Project of Anyang City(No.2022C01GX023);the support from Shanghai Synchrotron Radiation Facility(BL14B)for the sXRD experiments.

摘　　要：The hard-to-remove lattice water has been regarded as a significant obstacle impeding the practical use of Prussian blue analogue cathodes for sodium-ion batteries.This work monitored the electrochemical evolution of a hydrated monoclinic sodium manganese hexacyanoferrate cathode by solid-state nuclear magnetic resonance(NMR).For the first time,we established a correlation between the chemical shifts of ^(23)Na NMR signals and the presence or absence of lattice water within this cathode.Through this method,we verified the electrochemical dehydration process that coincides with the merging of two redox platforms and a phase transformation in the initial cycles.Furthermore,we discovered that the lattice water is completely removed after several-day cell rest following a single activation cycle.

关 键 词：Solid-state NMR DEHYDRATION Prussian blue analogues Sodium-ion batteries CATHODE 

分 类 号：O62[理学—有机化学]