Negative electrode active material for lithium secondary battery and lithium secondary battery comprising the same
View Patent ↗Provided is a negative electrode active material comprising (a) a core including one or more non-carbon-based materials selected from the group consisting of silicon, nickel, germanium, and titanium, and (b) an organic polymer coating layer formed of a polymer compound having a content of a fluorine component of 50 wt % or more on a surface of the core.
1. A negative electrode active material slurry comprising a negative electrode active material, a binder, and a solvent,
wherein the negative electrode active material comprises:
(a) a core including one or more non-carbon-based materials selected from the group consisting of silicon, nickel, germanium, and titanium; and
(b) a fluorine containing organic polymer coating layer formed uniformly on an entire surface of the core,
wherein a thickness of the fluorine containing organic polymer coating layer is in a range of 50 nm to 100 nm;
wherein the fluorine containing organic polymer coating layer comprises (a) an epoxy compound containing a fluorine component, (b) an acrylate-based compound containing a fluorine component, or (c) a silane-based compound containing a fluorine component;
wherein (a) the epoxy compound containing a fluorine component comprises a compound expressed as the following Chemical Formula 1:
(b) the acrylate-based compound containing a fluorine component comprises a compound expressed as the following Chemical Formula 2:
wherein R is a hydrogen or an alkyl group having carbon number of 1 to 2, n is an integer of 1 or 2, and m is 0 or an integer between 1 and 12; and
(c) the silane-based compound containing a fluorine component comprises a compound expressed as the following Chemical Formula 3:
CF 3 —(CF 2 ) o —(CH 2 ) p —SiCl 3 Chemical Formula 3
wherein o is an integer between 1 and 12, and p is an integer of 1 or 2.
2. The negative electrode active material slurry of claim 1 , wherein the non-carbon-based material is a single phase of silicon, nickel, germanium, or titanium, or an alloy phase thereof.
3. The negative electrode active material slurry of claim 1 , wherein the non-carbon-based material is in a form of a nanotube.
4. The negative electrode active material slurry of claim 1 , wherein the organic polymer coating layer is formed of a polymer compound having a content of a fluorine component of 50 wt % or more.
5. The negative electrode active material slurry of claim 4 , wherein the organic polymer coating layer is formed of a polymer compound having a content of a fluorine component ranging from 50 wt % to 95 wt %.
6. The negative electrode active material slurry of claim 1 , wherein the acrylate-based compound containing a fluorine component is 2,2,2-trifluoroethyl methacrylate, 2-(perfluorohexyl)ethyl methacrylate, 2-(perfluorooctyl)ethyl methacrylate, 2-(perfluorodecyl)ethyl methacrylate, or 2-(perfluorooctyl)ethyl acrylate.
7. The negative electrode active material slurry of claim 1 , wherein the silane-based compound containing a fluorine component is trichloro(1H,1H,2H,2H-perfluorooctyl)silane or perfluorodecyltrichlorosilane.
8. The negative electrode active material slurry of claim 1 , wherein the fluorine containing organic polymer coating layer is formed of a single layer or a multilayer.
9. The negative electrode active material slurry of claim 1 , wherein the fluorine containing organic polymer coating layer is formed by using a chemical vapor deposition method, a solvent evaporation method, a coprecipitation method, a precipitation method, a sol-gel method, an adsorption filtration method, or a sputtering method.
10. A lithium secondary battery comprising:
(i) a positive electrode comprising a positive electrode active material;
(ii) a negative electrode prepared by coating a current collector with the negative electrode active material slurry of claim 1 ;
(iii) a separator; and
(iv) an electrolyte,
wherein the negative electrode includes a negative active material comprising:
(a) a core including one or more non-carbon-based materials selected from the group consisting of silicon, nickel, germanium, and titanium; and
(b) a fluorine containing organic polymer coating layer formed uniformly on an entire surface of the core, wherein a thickness of the fluorine containing organic polymer coating layer is in a range of 50 nm to 100 nm
wherein the fluorine containing organic polymer coating layer comprises (a) an epoxy compound containing a fluorine component, (b) an acrylate-based compound containing a fluorine component, or (c) a silane-based compound containing a fluorine component;
wherein (a) the epoxy compound containing a fluorine component comprises a compound expressed as the following Chemical Formula 1:
(b) the acrylate-based compound containing a fluorine component comprises a compound expressed as the following Chemical Formula 2:
wherein R is a hydrogen or an alkyl group having carbon number of 1 to 2, n is an integer of 1 or 2, and m is 0 or an integer between 1 and 12; and
(c) the silane-based compound containing a fluorine component comprises a compound expressed as the following Chemical Formula 3:
CF 3 —(CF 2 ) o —(CH 2 ) p —SiCl 3 Chemical Formula 3
wherein o is an integer between 1 and 12, and p is an integer of 1 or 2.
11. A negative electrode active material slurry comprising a negative electrode active material, a binder, and a solvent,
wherein the negative electrode active material comprises:
(a) a core including one or more non-carbon-based materials selected from the group consisting of silicon, nickel, germanium, and titanium; and
(b) a fluorine containing organic polymer coating layer formed uniformly on an entire surface of the core,
wherein a thickness of the fluorine containing organic polymer coating layer is in a range of 50 nm to 100 nm;
wherein the fluorine containing organic polymer coating layer comprises at least one of (b) an acrylate-based compound containing a fluorine component, or (c) a silane-based compound containing a fluorine component;
wherein
(b) the acrylate-based compound containing a fluorine component comprises a compound expressed as the following Chemical Formula 2:
wherein R is a hydrogen or an alkyl group having carbon number of 1 to 2, n is an integer of 1 or 2, and m is 0 or an integer between 1 and 12, and
(c) the silane-based compound containing a fluorine component comprises a compound expressed as the following Chemical Formula 3:
CF 3 —(CF 2 ) o —(CH 2 ) p —SiCl 3 Chemical Formula 3
wherein o is an integer between 1 and 12, and p is an integer of 1 or 2.
12. A lithium secondary battery comprising:
(i) a positive electrode comprising a positive electrode active material;
(ii) a negative electrode prepared by coating a current collector with the negative electrode active material slurry of claim 11 ;
(iii) a separator; and
(iv) an electrolyte,
wherein the negative electrode includes a negative active material comprises:
(a) a core including one or more non-carbon-based materials selected from the group consisting of silicon, nickel, germanium, and titanium; and
(b) a fluorine containing organic polymer coating layer formed uniformly on an entire surface of the core,
wherein a thickness of the fluorine containing organic polymer coating layer is in a range of 50 nm to 100 nm;
wherein the fluorine containing organic polymer coating layer comprises at least one of (b) an acrylate-based compound containing a fluorine component, or (c) a silane-based compound containing a fluorine component;
wherein
(b) the acrylate-based compound containing a fluorine component comprises a compound expressed as the following Chemical Formula 2:
wherein R is a hydrogen or an alkyl group having carbon number of 1 to 2, n is an integer of 1 or 2, and m is 0 or an integer between 1 and 12, and
(c) the silane-based compound containing a fluorine component comprises a compound expressed as the following Chemical Formula 3:
CF 3 —(CF 2 ) o —(CH 2 ) p —SiCl 3 Chemical Formula 3
wherein o is an integer between 1 and 12, and p is an integer of 1 or 2.