Anode, lithium secondary battery comprising same, battery module comprising the lithium secondary battery, and method for manufacturing anode

1. An anode comprising:

a current collector;

a lithium metal layer provided on the current collector;

a lithium-silicon composite layer provided on the lithium metal layer; and

a silicon layer or silicon oxide layer provided on the lithium-silicon composite layer

wherein the silicon layer or silicon oxide layer comprises 5-20 parts by weight binder resin based on 100 parts by weight silicon and silicon oxide in the silicon layer or silicon oxide layer.

2. The anode of claim 1 , wherein the silicon layer or silicon oxide layer comprises a lithium-silicon composite in which the silicon or silicon oxide is alloyed with lithium.

3. The anode of claim 1 , wherein a weight ratio of a lithium element to a silicon element in the anode is 100:1 to 50.

4. The anode of claim 1 , wherein the lithium-silicon composite layer comprises a lithium-silicon composite represented by the following Chemical Formula 1 or a lithium-silicon oxide composite represented by the following Chemical Formula 2:

Li x Si  [Chemical Formula 1]

Li o SiO p   [Chemical Formula 2]

in Chemical Formulae 1 and 2, x is a real number of 1.0 to 4.0, o is each a real number of 0.3 to 4.0, and p is each a real number of 0.1 to 2.0.

5. The anode of claim 1 , wherein the silicon layer or silicon oxide layer is the outermost layer.

6. An anode comprising:

a current collector;

a lithium metal layer provided on the current collector; and

a lithium-silicon composite layer provided on the lithium metal layer and containing a lithium-silicon composition in which silicon or silicon oxide is alloyed with lithium,

wherein the lithium-silicon composite layer comprises 5-20 parts by weight binder resin based on 100 parts by weight silicon and silicon oxide in the lithium-silicon composite layer.

7. The anode of claim 6 , wherein the lithium-silicon composite layer comprises a lithium-silicon composite represented by the following Chemical Formula 1 or a lithium-silicon oxide composite represented by the following Chemical Formula 2:

Li x Si  [Chemical Formula 1]

Li o SiO p   [Chemical Formula 2]

in Chemical Formulae 1 and 2, x is a real number of 1.0 to 4.0, o is each a real number of 0.3 to 4.0, and p is each a real number of 0.1 to 2.0.

8. The anode of claim 6 , wherein the lithium-silicon composite layer is the outermost layer.

9. A lithium secondary battery comprising:

the anode of claim 1 ; and a cathode, and

an electrolyte provided between the anode and the cathode.

10. The lithium secondary battery of claim 9 , wherein the electrolyte is an electrolyte liquid in which the anode and the cathode are impregnated.

11. The lithium secondary battery of claim 10 , further comprising:

a separation membrane provided between the anode and the cathode.

12. The lithium secondary battery of claim 9 , wherein the electrolyte is a solid electrolyte membrane or a polymer electrolyte membrane.

13. A battery module comprising the lithium secondary battery of claim 9 as a unit cell.