Cation energy storage device and methods
AssigneeBrown University
InventorsG. Tayhas R. Palmore, Dan Liu
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Abstract
An energy storage composition can be used as a new Na-ion battery cathode material. The energy storage composition with an alluaudite phase of AxTy(PO4)z, NaxTy(PO4)z, Na1.702Fe3(PO4)3 and Na0.872Fe3(PO4)3, is described including the hydrothermal synthesis, crystal structure, and electrochemical properties. After ball milling and carbon coating, the compositions described herein demonstrate a reversible capacity, such as about 140.7 mAh/g. In addition these compositions exhibit good cycling performance (93% of the initial capacity is retained after 50 cycles) and excellent rate capability. These alluaudite compounds represent a new cathode material for large-scale battery applications that are earth-abundant and sustainable.
Claims3
An energy storage composition comprising the formula:
- AxTy(PO4)z, wherein:
- A is selected from a group consisting of Na, Mg, and Ca;
- T is selected from a group consisting of Fe, Co, Ni, Al, and Sn;
- x is selected from the numbers 0.872 and 1.702;
- y is a number greater than or equal to 1 and less than or equal to 3.5;
- and
- z is a number greater than 1 and less than or equal to 3.
The energy storage composition comprising the formula:
- AxTy(PO4)z, wherein:
- A represents Na;
- T represents Fe;
- x is selected from the numbers 0.872 and 1.702;
- y represents the number 3;
- and
- z represents the number 3.
A battery comprising:
- (i). a cathode comprising a cathode composite layer on a surface of a cathode collector having a cathode active material;
- (ii). an anode including an anode active material;
- (iii). a separator disposed between said cathode and said anode;
- and
- (iv) an electrolyte including ions, wherein said cathode active material is an energy storage composition, wherein the energy storage composition comprises the formula:
- AxTy(PO4)z, wherein:
- A represents Na;
- T represents Fe;
- x is selected from the numbers 0.872 and 1.702;
- y represents the number 3;
- and
- z represents the number 3.
Dependencies are inferred from the claim text.