Transition metal phosphate, production process thereof, positive electrode, and sodium secondary battery
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United States of America Patent
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Aug 5, 2014
Grant Date -
Nov 1, 2012
app pub date -
Jul 7, 2009
filing date -
Jul 9, 2008
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Abstract
The present invention provides a transition metal phosphate and a production process thereof, a positive electrode, and a sodium secondary battery. The transition metal phosphate contains sodium (Na), phosphorus (P) and a transition metal element and having a BET specific surface area of 1 m2/g to 50 m2/g. The process for producing a transition metal phosphate comprises steps (1) and (2): (1) a step of bringing a phosphorus (P) source, a sodium (Na) source, an M source (M is one or more transition metal elements) and water into contact with each other, and obtaining a liquid material thereby, and (2) a step of separating water from the liquid material and obtaining a transition metal phosphate thereby.
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