alexa Preparation, structure, and electrochemistry of layered polyanionic hydroxysulfates: LiMSO4OH (M = Fe, Co, Mn) electrodes for Li-ion batteries.
Materials Science

Materials Science

Journal of Material Sciences & Engineering

Author(s): Subban CV, Ati M, Rousse G, Abakumov AM, Van Tendeloo G, , Subban CV, Ati M, Rousse G, Abakumov AM, Van Tendeloo G,

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Abstract The Li-ion rechargeable battery, due to its high energy density, has driven remarkable advances in portable electronics. Moving toward more sustainable electrodes could make this technology even more attractive to large-volume applications. We present here a new family of 3d-metal hydroxysulfates of general formula LiMSO4OH (M = Fe, Co, and Mn) among which (i) LiFeSO4OH reversibly releases 0.7 Li(+) at an average potential of 3.6 V vs Li(+)/Li(0), slightly higher than the potential of currently lauded LiFePO4 (3.45 V) electrode material, and (ii) LiCoSO4OH shows a redox activity at 4.7 V vs Li(+)/Li(0). Besides, these compounds can be easily made at temperatures near 200 °C via a synthesis process that enlists a new intermediate phase of composition M3(SO4)2(OH)2 (M = Fe, Co, Mn, and Ni), related to the mineral caminite. Structurally, we found that LiFeSO4OH is a layered phase unlike the previously reported 3.2 V tavorite LiFeSO4OH. This work should provide an impetus to experimentalists for designing better electrolytes to fully tap the capacity of high-voltage Co-based hydroxysulfates, and to theorists for providing a means to predict the electrochemical redox activity of two polymorphs. This article was published in J Am Chem Soc and referenced in Journal of Material Sciences & Engineering

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