Negative electrode for preventing deposition of manganese and battery cell including the same

1. A battery cell having an electrode assembly that is sealed with an electrolyte solution within a battery case, the electrode assembly comprising:

first and second negative electrodes electrically connected to first and second negative electrode terminals, respectively;

a positive electrode electrically connected to a positive electrode terminal and disposed between the first and second negative electrodes; and

first and second separators disposed between the positive electrode and the first and second negative electrodes, respectively,

the battery cell having an activation configuration and an operation configuration,

wherein the battery cell in the activation configuration has an electrical connection between the positive electrode terminal and the second negative electrode terminal, while electrical connection between the positive electrode terminal and the first negative electrode terminal is blocked, and

wherein the battery cell in the operation configuration has an electrical connection between the positive electrode terminal and the first negative electrode terminal, while electrical connection between the positive electrode terminal and the second negative electrode terminal is blocked.

2. The battery cell according to claim 1 , wherein an activation process is performed in a potential of 2.8 V to 3.65 V with respect to Li/Li+.

3. The battery cell according to claim 1 , wherein the second negative electrode are located in an outermost area of the electrode assembly.

4. The battery cell according to claim 1 , wherein the positive electrode terminal, the first negative electrode terminal and the second negative electrode terminal protrude to outside of the battery case.

5. The battery cell according to claim 4 , wherein the positive electrode terminal, the first negative electrode terminal and the second negative electrode terminal are formed while not contacting to one another in the form of wrapping an outer circumference of the battery case at the outside of the battery case.

6. The battery cell according to claim 1 , wherein the positive electrode terminal, the first negative electrode terminal and the second negative electrode terminal are an electrode tab or an electrode lead.

7. The battery cell according to claim 1 , wherein one face or two opposing faces of electrode current collectors of the positive electrode, the first negative electrode and the second negative electrode are coated with electrode mixtures comprising respective electrode active materials.

8. The battery cell according to claim 7 , wherein the electrode current collector of the second negative electrode is a mesh-shaped porous metal.

9. The battery cell according to claim 8 , wherein the porous metal is a metal selected from the group consisting of copper, stainless steel, nickel and aluminum, or an alloy thereof.

10. The battery cell according to claim 7 , wherein the electrode current collectors of the positive electrode, the negative electrode and the second negative electrode are mesh-shaped porous metals.

11. The battery cell according to claim 10 , wherein the porous metal is a metal selected from the group consisting of copper, stainless steel, nickel and aluminum, or an alloy thereof.

12. The battery cell according to claim 7 , wherein the electrode active material of the positive electrode comprises a lithium transition metal oxide represented by Formula 1 or 2 below:

Li x M y Mn 2-y O 4-z A z   (1)

wherein M is at least one element selected from the group consisting of Al, Mg, Ni, Co, Fe, Cr, V, Ti, Cu, B, Ca, Zn, Zr, Nb, Mo, Sr, Sb, W, Ti and Bi;

A of Formula 1 is at least one monovalent or divalent anion; 0.9≤x≤1.2, 0<y<2, and 0≤z<0.2,

(1 −x )LiM′O 2-y A y −x Li 2 MnO 3-y′ A y′   (2)

wherein M′ is Mn a M b ;

M is at least one selected from the group consisting of Ni, Ti, Co, Al, Cu, Fe, Mg, B, Cr, Zr, Zn and Period II transition metals;

A of Formula 2 is at least one selected from the group consisting of PO 4 , BO 3 , CO 3 , F and NO 3 ; and

0<x<1, 0<y<0.02, 0<y′≤0.02, 0.5≤a≤1.0, 0≤b≤0.5, and a+b=1.

13. The battery cell according to claim 7 , wherein the electrode active materials of the first negative electrode and the second negative electrode comprise a carbon based material and/or Si.

14. The battery cell according to claim 1 , wherein the battery case is composed of a laminate sheet comprising a resin layer and a metal layer.

15. The battery cell according to claim 1 , wherein the battery cell is a lithium ion battery, a lithium ion polymer battery or a lithium polymer battery.

16. A battery module comprising the battery cell according to claim 1 .

17. A battery pack comprising the battery module according to claim 16 .

18. A device comprising the battery pack according to claim 17 as a power source.

19. The device according to claim 18 , the device is an electric vehicle, a hybrid electric vehicle, a plug-in hybrid electric vehicle or a system for storing power.

20. A battery cell having an electrode assembly that is sealed with an electrolyte solution within a battery case, the electrode assembly comprising:

a positive electrode electrically connected to a positive electrode terminal;

first and second negative electrodes electrically connected to first and second negative electrode terminals, respectively, the second negative electrode disposed between the positive electrode and the first negative electrode; and

first and second separators, the first separator disposed between the second negative electrode and the positive electrode, the second separator disposed between the second negative electrode and the first negative electrode;

the battery cell having an activation configuration and an operation configuration,

wherein the battery cell in the activation configuration has an electrical connection between the positive electrode terminal and the second negative electrode terminal, while electrical connection between the positive electrode terminal and the first negative electrode terminal is blocked, and

wherein the battery cell in the operation configuration has an electrical connection between the positive electrode terminal and the first negative electrode terminal, while electrical connection between the positive electrode terminal and the second negative electrode terminal is blocked.

21. A battery cell having an electrode assembly that is sealed with an electrolyte solution within a battery case, the electrode assembly comprising:

two positive electrodes electrically connected to a positive electrode terminal;

two first negative electrodes electrically connected to a first negative electrode terminal;

two second negative electrodes electrically connected to a second negative electrode terminal, a first one of the second negative electrodes disposed between and adjacent to one of the positive electrodes and the battery case, a second one of the second negative electrodes disposed between and adjacent to one of the positive electrodes and one of the first negative electrodes; and

a plurality of separators, each of the electrodes separated from adjacent ones of the other electrodes by a corresponding one of the plurality of separators;

the battery cell having an activation configuration and an operation configuration,

wherein the battery cell in the activation configuration has an electrical connection between the positive electrode terminal and the second negative electrode terminal, while electrical connection between the positive electrode terminal and the first negative electrode terminal is blocked, and

wherein the battery cell in the operation configuration has an electrical connection between the positive electrode terminal and the first negative electrode terminal, while electrical connection between the positive electrode terminal and the second negative electrode terminal is blocked.