Anode active material with a core-shell structure, lithium secondary battery comprising same, and method for preparing anode active material with a core-shell structure
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United States of America Patent
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May 21, 2019
Grant Date -
Jan 11, 2018
app pub date -
Dec 15, 2015
filing date -
Apr 22, 2015
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Abstract
An anode active material and a method for preparing the same, wherein the anode active material has a core-shell structure having formula (MOx-Liy)-C (here, M is a metal (or metalloid), x is greater than 0 and less than 1.5, and y is greater than 0 and less than 4) and including a core part containing an alloy of a metal (or metalloid) oxide-Li (MOx-Liy) and a shell part containing a carbon material coated on a surface of the core part, wherein the shell part contains lithium in an amount less than 5 atm % in the surface and the inner portion thereof. The anode active material can provide high capacity, excellent cycle characteristics, excellent volume expansion control capability, and high initial efficiency.
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