Abstract
AbstractSodium‐ion batteries are considered as the immediate sustainable alternative to lithium‐ion systems. To reduce the competitiveness gap, improved performances and better understanding of sodium storage, especially of new phases based on sustainable materials, are further required. In this work, we provide advanced investigation of the structure and the electrochemistry of a peculiar off‐stoichiometric iron‐rich phase (Na0.6Fe1.2PO4) for sodium storage. An interesting electrochemical activation phenomenon is described and contrary to conventional ageing processes it is found to significantly enhance the energy and power rate performances.
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