Electrochemical Grinding-Induced Metallic Assembly Exploiting a Facile Conversion Reaction Route of Metal Oxides toward Li Ions

摘要: Abstract Conversion-type electrodes generally feature unstable cycling stability as an anode for Li ion batteries. In this work, however, we suggest that the weird capacity increase after initial decay during is likely a common electrode materials undergoing high-rate conversion reaction. The with α-Fe2O3 anodes at current density of 500 mA g−1 or more could effectively trigger typical cycle number its degradation. Its morphological and structural evolutions are comprehensively characterized here by synchrotron X-ray scattering, absorption photoelectron spectroscopies, electron microscopy. investigation demonstrates enough fast reaction tends to reduce crystallite size significantly result electrochemical grinding continuous can generate Fe-Fe-Fe medium-range ordering terminated long Fe-O bonds, which exploits facile route catalyzing dissociation Li2O toward lower redox potential faster kinetics. details, higher heterogeneity, larger stress/strain thinner solid-electrolyte interphase layer accompanied in make pristine crystallites smaller, finally extending proportion thereby facilitating following charge/discharge. Most importantly, new structure enables excellent performance full cell, contrast catastrophic failure oxides. evolution addressed study updates understanding reactions sheds light on novel types conversion-type towards full-cell application conversion-reaction electrodes.