Positive electrode active material for secondary battery, method of preparing the same, and secondary battery including the positive electrode active material
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United States of America Patent
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Mar 26, 2019
Grant Date -
Jan 11, 2018
app pub date -
Jun 17, 2016
filing date -
Jun 17, 2015
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Abstract
The present invention provides a positive electrode active material for a secondary battery, which includes a core, a shell disposed to surround the core, and a buffer layer which is disposed between the core and the shell and includes pores and a three-dimensional network structure connecting the core and the shell, wherein, the core, the shell, and the three-dimensional network structure of the buffer layer each independently include a lithium nickel manganese cobalt-based composite metal oxide and at least one metallic element of the nickel, the manganese, and the cobalt has a concentration gradient that gradually changes in any one region of the core, the shell, and the entire positive electrode active material.
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