CPC H01M 4/136 (2013.01) [C01B 25/375 (2013.01); C01B 25/38 (2013.01); C01B 25/445 (2013.01); C01B 25/45 (2013.01); H01M 4/366 (2013.01); H01M 4/5825 (2013.01); H01M 4/62 (2013.01); H01M 4/625 (2013.01); H01M 10/054 (2013.01); H01M 10/0525 (2013.01); H01M 10/052 (2013.01)] | 18 Claims |
1. A composition comprising a material having an alluaudite crystal structure;
wherein the alluaudite crystal structure is made by a method comprising the steps of:
(1) dissolving reactants (A) (NH4)2Fe(SO4)2-6H2O, (B) H3PO4, and (C) NaOH in water with a 1:1:3 molar ratio (A:B:C), thereby forming a cathode solution; and
(2) heating the cathode solution, whereby said reactants crystallize in a monoclinic C 2/c space group consisting of pure alluaudite crystal; and
wherein the alluaudite crystal structure comprises formula (I):
Na1.702Fey(PO4)z (formula I);
wherein y is greater than or equal to 3 and less than or equal to 3.5, and wherein z is greater than or equal to 1 and less than or equal to 3.
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13. A method of making a material having an alluaudite crystal structure capable of providing an energy storage capacity of up to about 160 mAh/g, the method comprising the steps of:
(1) dissolving reactants (A) (NH4)2Fe(SO4)2-6H2O, (B) H3PO4, and (C) NaOH in water with a 1:1:3 molar ratio (A:B:C), thereby forming a cathode solution; and
(2) heating the cathode solution, whereby said reactants crystallize in a monoclinic C 2/c space group consisting of pure alluaudite crystal; and
wherein the alluaudite crystal structure comprises formula (I):
Na1.702Fey(PO4)z (formula I);
wherein y is greater than or equal to 3 and less than or equal to 3.5, and wherein z is greater than or equal to 1 and less than or equal to 3.
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