Positive electrode active material for lithium secondary battery, preparing method thereof, and lithium secondary battery including positive electrode including the same
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United States of America Patent
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Jul 2, 2019
Grant Date -
May 11, 2017
app pub date -
Nov 4, 2016
filing date -
Nov 6, 2015
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Abstract
A positive electrode active material for a lithium secondary battery, a method of preparing the same, and a lithium secondary battery, the positive electrode active material including nickel, cobalt, and manganese, wherein the positive electrode active material has a core part and a surface part, an amount of manganese in the core part and the surface part is higher than 25 mol %, and amounts of nickel and cobalt in the positive electrode active material vary such that a concentration gradient of the nickel and the cobalt in a direction from the core part to the surface part is present in the positive electrode active material.
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