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ÌâÄ¿£ºEldfellite, NaFe(SO4)2: an intercalation cathode host for low-cost Na-ion batteries £¨¹ËÀÏÒ¯×Ó£¬ÕæÕýµÄ´óÅ£À´ÁË£¡£© ×÷ÕߣºPreetam Singh,a Konda Shiva,a Hugo Celioa, John B. Goodenough*a a Texas Materials Institute and Materials Science and Engineering Program, The University of Texas at Austin, Austin, USA E-mail: jgoodenough@mail.utexas.edu GA.gif ÕªÒª£ºThe mineral eldfellite, NaFe(SO4)2, is characterized as a potential cathode for a Na-ion battery that is fabricated in charged state; its 3 V discharge versus sodium for reversible Na+ intercalation is shown to have a better capacity, but lower insertion rate than Li+ intercalation. The theoretical specific capacity for Na+ insertion is 99 mA h g−1. After 80 cycles at 0.1C versus a Na anode, the specific capacity was 78 mA h g−1 with a coulomb efficiency approaching 100%. 0000055234.gif |
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