Lithium electrode and lithium secondary battery comprising the same

Patent metadata

Field	Value
Publication number	US-9673443-B2
Application number	US-201414440539-A
Country	US
Kind code	B2
Filing date	Sep 3, 2014
Priority date	Sep 11, 2013
Publication date	Jun 6, 2017
Grant date	Jun 6, 2017

Abstract

The present disclosure relates to a lithium electrode, comprising a porous metallic current collector; and lithium metal inserted into pores present in the metallic current collector. The lithium electrode according to the present disclosure can increase contact surface between lithium metal and a current collector to improve the performances of a lithium secondary battery, and can exhibit uniform electron distribution therein to prevent the growth of lithium dendrites during the operation of a lithium secondary battery, thereby improving the safety of a lithium secondary battery.

First claim

What is claimed is:

1. A lithium electrode, comprising:
a porous metallic current collector; and
lithium metal inserted into pores present in the metallic current collector,
wherein the lithium metal is inserted in an amount of 1 to 50 wt % based on the total weight of the lithium electrode.

2. The lithium electrode of claim 1 , wherein the metallic current collector is made of any one selected from the group consisting of copper, nickel, iron, chromium, zinc, stainless steel and a mixture thereof.

3. The lithium electrode of claim 1 , wherein the metallic current collector has a porosity of 50 to 99%.

4. The lithium electrode of claim 1 , wherein the pores have a size of 5 to 500 μm.

5. The lithium electrode of claim 1 , wherein the metallic current collector is in the form of metal mesh or metal foam.

6. A lithium secondary battery, comprising:
an electrode assembly comprising a cathode, an anode, and a separator interposed therebetween;
a battery case for receiving the electrode assembly; and
a non-aqueous electrolyte solution being introduced in the battery case to be impregnated into the electrode assembly,
wherein the anode is the lithium electrode of claim 1 .

7. The lithium secondary battery of claim 6 , wherein the cathode comprises a cathode active material selected from the group consisting of LiCoO 2 , LiNiO 2 , LiMn 2 O 4 , LiCoPO 4 , LiFePO 4 , LiNiMnCoO 2 , LiNi 1-y-z Co x M1 y M2 z O 2 (wherein M1 and M2 are each independently selected from the group consisting of Al, Ni, Co, Fe, Mn, V, Cr, Ti, W, Ta, Mg and Mo, and x, y and z are each independently an atomic fraction of oxide-forming elements, in which 0≦x<0.5, 0≦y<0.5, 0≦z<0.5, and x+y+z≦1), and a mixture thereof.

8. The lithium secondary battery of claim 6 , wherein the separator is a porous substrate made of any one selected from the group consisting of polyethylene, polypropylene, polybutylene, polypentene, polyethylene terephthalate, polybutylene terephthalate, polyester, polyacetal, polyamide, polycarbonate, polyimide, polyetheretherketone, polyethersulfone, polyphenylene oxide, polyphenylene sulfide, polyethylene naphthalate and a mixture thereof.

9. The lithium secondary battery of claim 6 , wherein the non-aqueous electrolyte solution comprises an organic solvent and an electrolyte salt.

10. The lithium secondary battery of claim 9 , wherein the organic solvent is any one selected from the group consisting of ethylene carbonate (EC), propylene carbonate (PC), 1,2-butylene carbonate, 2,3-butylene carbonate, 1,2-pentylene carbonate, 2,3-pentylene carbonate, vinylene carbonate, vinyl ethylene carbonate, fluoroethylene carbonate (FEC), dimethyl carbonate (DMC), diethyl carbonate (DEC), dipropyl carbonate, ethyl methyl carbonate (EMC), ethyl propyl carbonate, ethyl propyl carbonate, dimethyl ether, diethyl ether, dipropyl ether, methyl ethyl ether, methyl propyl ether, ethyl propyl ether, methyl acetate, ethyl acetate, propyl acetate, methyl propionate, ethyl propionate, propyl propionate, γ-butyrolactone, γ-valerolactone, γ-caprolactone, σ-valerolactone, ε-caprolactone and a mixture thereof.

11. The lithium secondary battery of claim 9 , wherein the electrolyte salt comprises an anion selected from the group consisting of F − , Cl − , Br − , I − ,NO 3 − , N(CN) 2 − , BF 4 − , ClO 4 − , PF 6 − , (CF 3 ) 2 PF 4 − , (CF 3 ) 3 PF 3 − , (CF 3 ) 4 PF 2 − , (CF 3 ) 5 PF − , (CF 3 ) 6 P − , CF 3 SO 3 − , CF 3 CF 2 SO 3 − , (CF 3 SO 2 ) 2 N − , (FSO 2 ) 2 N − , CF 3 CF 2 (CF 3 ) 2 CO − , (CF 3 SO 2 ) 2 CH − , (SF 5 ) 3 C − , (CF 3 SO 2 ) 3 C − , CF 3 (CF 2 ) 7 SO 3 − , CF 3 CO 2 − , CH 3 CO 2 − , SCN − and (CF 3 CF 2 SO 2 ) 2 N − .

12. The lithium secondary battery of claim 6 , wherein the battery case is cylindrical, prismatic, pouch, or coin forms.

Assignees

• Lg Chemical Ltd

Inventors

• Son Byoung-Kuk
• Jang Min-Chul
• Kim Min-Seo
• Sung Da-Young
• Lee Seong-Ho

Classifications

• Y02E60/10

  Energy storage using batteries · CPC title

• H01M10/052

  Li-accumulators · CPC title

• H01M4/80

  Porous plates, e.g. sintered carriers · CPC title

• H01M4/762

  Porous or perforated metallic containers · CPC title

• H01M4/74

  Meshes or woven material; Expanded metal · CPC title