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US 12,614,715 B2Granted
Negative electrode active material, negative electrode including the same, and secondary battery including the negative electrode
AssigneeLG Energy Solution, Ltd.
InventorsJung Hyun Choi, Yong Ju Lee, Eun Kyung Kim, Rae Hwan Jo, Su Min Lee, Dong Hyuk Kim, Se Mi Park, Il Geun Oh
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Abstract
The present invention relates to a negative electrode active material including a carbonaceous matrix having a first particle and a second particle, wherein the first particle includes a silicon core, an oxide layer disposed on the silicon core and including SiOx (0<x≤2), and a coating layer covering at least a portion of the surface of the oxide layer and including LiF, and the second particle includes graphene.
Claims18
A negative electrode active material comprising a carbonaceous matrix including a first particle and a second particle,
- wherein the first particle comprises:
- a silicon core;
- an oxide layer disposed on the silicon core and including SiOx (0<x≤2) and at least any one of Li2SiO3, Li4SiO4, or Li2Si2O5, wherein the oxide layer is a single layer;
- and
- a coating layer disposed on a surface of the oxide layer, and the coating layer including LiF in an amount of 0.5 wt % to 15 wt % based on a total weight of the negative electrode active material, wherein the LiF is made of both a crystalline phase and an amorphous phase,
- wherein the second particle includes graphene and flake graphite,
- wherein a BET specific surface area value of the flake graphite is 1 m2/g to 200 m2/g, and
- wherein the first particle and the second particle are in contact with each other to form a composite.
5 more elements
Dependencies are inferred from the claim text.