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Lithium tungstate is the inorganic compound with the formula Li₂WO₄. It is a white solid that is soluble in water. The compound is one of the several orthotungstates, compounds that feature the tetrahedral WO₄²⁻ anion.
Method for estimating the molar ratio of lithium derived from lithium tungstate, estimation apparatus, and method for manufacturing lithium-ion secondary batteries.
This invention provides a method for estimating the amount of coating present on the surface of a positive electrode active material. [Solution] An estimation method comprising: obtaining the lithium content (Li) and the content of metals other than lithium in the positive electrode active material (Me) in the battery, assuming that the lithium content derived from the positive electrode active material is 1 mole, and calculating the ratio of Li to Me; obtaining the amount of Ni and Li mixed in the positive electrode active material and calculating the molar ratio of the mixing amounts; obtaining the lithium carbonate content and calculating the molar ratio of lithium derived from lithium carbonate; obtaining the lithium hydroxide content and calculating the molar ratio of lithium derived from lithium hydroxide; and calculating the molar ratio of lithium derived from lithium tungstate using the following formula (1). [Li / Me]-(1-[Ni mixing])=[Li mixing]+[Li2CO3]+[LiOH]+[Lithium tungstate] Equation (1)
Owner:TOYOTA BATTERY CO LTD