Negative electrode active material for lithium secondary battery, lithium secondary battery including same, and method for producing same
AssigneeChang Sung Co.
InventorsTae Kyung LEE, Seung Nam YANG, Nam Kyu CHOI
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Abstract
An embodiment provides: a negative electrode active material for a lithium secondary battery, wherein the negative electrode active material has silicon nanoparticles distributed in a silicon alloy and contains a Si—Al—Ni—B composition; and a method for producing same. Accordingly, a negative electrode active material for a lithium secondary battery can be provided, wherein the negative electrode active material has a controlled volume expansion rate and excellent electrical properties.
Claims16
A negative electrode active material for a lithium secondary battery, the negative electrode active material comprising:
- an alloy matrix comprising Si, Al, and Ni;
- and
- silicon nanoparticles dispersed in the alloy matrix,
- wherein the Al is in a range from 18 atomic % to 28 atomic % with respect to the total content of the negative electrode active material, the Ni is in a range from 10 atomic % to 20 atomic % with respect to the total content, and the Si is the remainder.
A method for producing a negative electrode active material for a lithium secondary battery, the method comprising:
- a melting step of placing a first material comprising Si, a second material comprising Al, and a third material comprising Ni in a reaction vessel and heating them to form a metal melt;
- and
- an atomizing step of spraying the metal melt through a nozzle hole and cooling the sprayed metal melt by spraying a dispersion medium to solidify the metal melt into silicon alloy powder,
- wherein the Al in the metal melt is set to be in a range from 18 atomic % to 28 atomic % with respect to the total atoms in the metal melt, the Ni in the metal melt is set to be in a range from 10 atomic % to 20 atomic % with respect to the total atoms in the metal melt, and the remainder is Si.
Dependencies are inferred from the claim text.