Design of new electrode materials for Li-ion and Na-ion batteries from the bloedite mineral Na2Mg(SO4)(2)center dot 4H(2)O

作者：Reynaud Marine; Rousse Gwenaelle; Abakumov Artem M; Sougrati Moulay T; Van Tendeloo Gustaaf; Chotard Jean Noel; Tarascon Jean Marie^*

来源：Journal of Materials Chemistry A, 2014, 2(8): 2671-2680.

DOI：10.1039/c3ta13648e

Mineralogy offers a large database to search for Li- or Na-based compounds having suitable structural features for acting as electrode materials, LiFePO4 being one example. Here we further explore this avenue and report on the electrochemical properties of the bloedite type compounds Na2M(SO4)(2)center dot 4H(2)O (M = Mg, Fe, Co, Ni, Zn) and their dehydrated phases Na2M(SO4)(2) (M = Fe, Co), whose structures have been solved via complementary synchrotron X-ray diffraction, neutron powder diffraction and transmission electron microscopy. Among these compounds, the hydrated and anhydrous iron-based phases show electrochemical activity with the reversible release/uptake of 1 Na+ or 1 Li+ at high voltages of similar to 3.3 V vs. Na+/Na-0 and similar to 3.6 V vs. Li+/Li-0, respectively. Although the reversible capacities remain lower than 100 mA h g(-1), we hope this work will stress further the importance of mineralogy as a source of inspiration for designing eco-efficient electrode materials.

• 出版日期2014