Electrode material and method for manufacturing power storage device

摘要

To provide a power storage device including an electrode material having a large capacity. First heat treatment is performed on a mixture of a compound containing lithium; a compound containing a metal element selected from manganese, iron, cobalt, and nickel; and a compound containing phosphorus. A cleaning step is performed on the mixture subjected to the first heat treatment. Second heat treatment is performed on the mixture subjected to the cleaning step, so that a lithium phosphate compound is produced. With the use of the lithium phosphate compound, an electrode is formed.

主权项

1. A method for manufacturing a power storage device, comprising:
performing first heat treatment on a mixture of a first compound including lithium and sulfur which is a first impurity element, a second compound including phosphorus and sulfur which is a second impurity element, and a third compound including a metal element and sulfur which is a third impurity element such that the metal element is selected from manganese, iron, cobalt, and nickel; performing a cleaning step on the mixture after the first heat treatment by using an alkaline cleaning solution; performing second heat treatment on the mixture to produce a lithium phosphate compound after the cleaning step; and forming an electrode including the lithium phosphate compound, wherein a concentration of the first impurity element contained in the first compound is 1 ppm or less, wherein a concentration of the second impurity element contained in the second compound is 5 ppm or less, and wherein a concentration of the third impurity element contained in the third compound is 1.6 ppm or less.