Electrode active composite materials and methods of making thereof
AssigneeMeecotech, Inc.
InventorTao Gu
Life of this patent
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Abstract
A method of synthesizing a lithium metal phosphate composite usable for a lithium secondary battery includes the steps of forming a nanometer-size precursor comprising lithium source and metal phosphate nanoparticles having each nanoparticle at least partially coated a layer of carbon precursor, spray drying the nanometer-size precursor at a first desired temperature to form micron-size particles packed with the lithium metal phosphate precursor nanoparticles, and sintering the micron-size particles at a second desired temperature under an inert and/or reduction atmosphere to form a micron-size lithium metal phosphate composite.
Claims20
A method of synthesizing a lithium iron phosphate composite usable for a lithium secondary battery, comprising the steps of:
- providing a first solution and a second solution, wherein the first solution comprises ferric chloride hexahydrate dissolved in water, and wherein the second solution comprises diammonium hydrogen phosphate and pyrrole dissolved in water;
- drop-wisely adding the first solution into the second solution with stirring to form a first mixture;
- stirring the first mixture for a first period of time;
- filtering and rinsing the stirred mixture with water to obtain solid substances;
- forming a composite of FePO4 and carbon precursor from the solid substances;
- mixing an equivalent mole of a lithium compound and a sucrose with the FePO4 composite to form a second mixture;
- ball-milling the second mixture for a second period of time to form a lithium iron phosphate precursor comprising nanometer-sized particles;
- and
- sintering the lithium iron phosphate precursor under an argon and hydrogen gas mixture at a first temperature for a third period of time to form a lithium iron phosphate composite.
A method of synthesizing a lithium metal phosphate composite usable for a lithium secondary battery, comprising the steps of:
- forming a nanometer-size precursor comprising lithium source and metal phosphate nanoparticles having each nanoparticle at least partially coated a layer of carbon precursor;
- spray drying the nanometer-size precursor at a first desired temperature to form micron-size particles packed with the lithium metal phosphate precursor nanoparticles;
- and
- sintering the micron-size particles at a second desired temperature under an inert and/or reduction atmosphere to form a micron-size lithium metal phosphate composite.
Dependencies are inferred from the claim text.