Carbon materials are crucially important for the realization of potassium-ion batteries.However,the potas-sium storage mechanisms in various carbon materials are incompletely understood.Herein,solid-state 13C nuclear magnetic resonance(NMR)spectroscopy coupled with Raman and X-ray diffraction(XRD)techniques are employed to study the reaction mechanism in a soft carbon quantita-tively.It is revealed that the insertion of potassium ions into the soft carbon firstly induces a transformation of the disor-dered region to short-range ordered stacking,involving both the pristine local unorganized and organized carbon layers.Subsequently,potassium ions intercalate into the rearranged carbon structure,finally producing the nano-sized KC8.Moreover,a remarkable capacity of 322 mAh·g-1 with a low mid potassiation voltage of＜0.3 V is present for the pre-pared soft carbon,which is on account of the underlying potassium storage sites,including the disordered stacking carbon as a main component of the soft carbon.These results suggest that regulating the disordered stacking region in the turbostratic structure of soft carbon is a critical issue for fur-ther improving the potassium storage performance.

Jing-Heng Han;Jia He;Qi-Yao Zou;Jie Zhang;Zhi Yang;Zhi-Wei Zhao;Hui-Xin Chen;Hong-Jun Yue;Da-Wei Wang;Hai-Chen Lin;Hao-Dong Liu;Gui-Ming Zhong;Zhang-Quan Peng

College of Chemistry and Material Science,Fujian Normal University,Fuzhou 350000,China;CAS Key Laboratory of Design and Assembly of Functional Nanostructures,and Fujian Provincial Key Laboratory of Nanomaterials,Fujian Institute of Research on the Structure of Matter,Chinese Academy of Sciences,Fuzhou 350002,China;Xiamen Key Laboratory of Rare Earth Photoelectric Functional Materials,Xiamen Institute of Rare-Earth Materials,Haixi Institutes,Chinese Academy of Sciences,Xiamen 361021,China;Laboratory of Advanced Spectro-Electrochemistry and Li-Ion Batteries,Dalian Institute of Chemical Physics,Chinese Academy of Sciences,Dalian 116023,China;Key Laboratory of Automobile Materials of Ministry of Education&School of Materials Science and Engineering,Jilin University,Changchun 130025,China;Chemical Engineering,University of California San Diego,La Jolla,San Diego,CA 92093,USA

稀有金属（英文版）

[1]Jing-Heng Han;Jia He;Qi-Yao Zou;Jie Zhang;Zhi Yang;Zhi-Wei Zhao;Hui-Xin Chen;Hong-Jun Yue;Da-Wei Wang;Hai-Chen Lin;Hao-Dong Liu;Gui-Ming Zhong;Zhang-Quan Peng-.High-capacity potassium ion storage mechanisms in a soft carbon revealed by solid-state NMR spectroscopy)[J].稀有金属（英文版）,2022(11):3752-3761

unorganized,intercalate,KC8,turbostratic

High,capacity,potassium,storage,mechanisms,soft,carbon,revealed,by,solid,state,NMR,spectroscopy,Carbon,materials,crucially,important,realization,batteries,However,various,incompletely,understood,Herein,13C,nuclear,magnetic,resonance,coupled,Raman,ray,diffraction,techniques,employed,study,reaction,quantita,tively,It,that,insertion,ions,into,firstly,induces,transformation,region,short,stacking,involving,both,pristine,local,layers,Subsequently,rearranged,structure,finally,producing,nano,sized,Moreover,remarkable,mAh,low,mid,potassiation,voltage,present,pared,which,account,underlying,sites,including,disordered,main,component,These,results,suggest,regulating,critical,issue,fur,ther,improving,performance

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