Method of preparing electrode for lithium secondary battery and electrode for lithium secondary battery prepared by using the same

Patent metadata

Field	Value
Publication number	US-2021359287-A1
Application number	US-201917288396-A
Country	US
Kind code	A1
Filing date	Oct 18, 2019
Priority date	Oct 26, 2018
Publication date	Nov 18, 2021
Grant date	—

Abstract

The present invention provides a method of preparing an electrode for a lithium secondary battery which includes forming a first electrolyte layer by immersing an electrode current collector in a composition for forming the first electrolyte layer and applying a current, and forming a second electrolyte layer by immersing the electrode current collector having the first electrolyte layer formed thereon in a composition for forming the second electrolyte layer and applying a current, wherein one of the composition for forming the first electrolyte layer and the composition for forming the second electrolyte layer is a composition for forming an organic electrolyte layer, and another one is a composition for forming an inorganic electrolyte layer, and the composition for forming an inorganic electrolyte layer includes a compound represented by Formula 1.

First claim

1 . A method of preparing an electrode for a lithium secondary battery, comprising:
forming a first electrolyte layer by immersing an electrode current collector in a composition for forming the first electrolyte layer and applying a current; and forming a second electrolyte layer by immersing the electrode current collector having the first electrolyte layer formed thereon in a composition for forming the second electrolyte layer and applying a current, wherein one of the composition for forming the first electrolyte layer or the composition for forming the second electrolyte layer is a composition for forming an organic electrolyte layer, and another one is a composition for forming an inorganic electrolyte layer, and the composition for forming an inorganic electrolyte layer comprises a compound represented by Formula 1:
MM′X n− m(SO 2 )  [Formula 1]

M is a metallic element selected from the group consisting of lithium (Li), sodium (Na), potassium (K), and rubidium (Rb), M′ is a metallic element selected from the group consisting of aluminum (Al), gallium (Ga), indium (In), and titanium (Ti), X is a halogen element selected from the group consisting of fluorine (F), chlorine (Cl), bromine (Br), and iodine (I), n is an integer of 1 to 6, and m is an integer of 1 to 10.

2 . The method of claim 1 , wherein the composition for forming the first electrolyte layer is the composition for forming an organic electrolyte layer, and
the composition for forming the second electrolyte layer is the composition for forming an inorganic electrolyte layer.

3 . The method of claim 1 , wherein the composition for forming the first electrolyte layer is the composition for forming an inorganic electrolyte layer, and
the composition for forming the second electrolyte layer is the composition for forming an organic electrolyte layer.

4 . The method of claim 1 , wherein the composition for forming an organic electrolyte layer comprises an organic solvent,
wherein the organic solvent comprises at least one compound selected from the group consisting of a halogen element-substituted or unsubstituted carbonate-based compound, a halogen element-substituted or unsubstituted acetate-based compound, a halogen element-substituted or unsubstituted glyme-based compound, a halogen element-substituted or unsubstituted ether-based compound, and a halogen element-substituted or unsubstituted nitrile-based compound.

5 . The method of claim 1 , wherein the composition for forming an organic electrolyte layer comprises a lithium salt.

6 . The method of claim 1 , wherein the composition for forming an organic electrolyte layer further comprises an additive,
wherein the additive comprises at least one compound selected from the group consisting of vinylene carbonate, vinylethylene carbonate, propanesultone, propenesultone, lithium difluoro(oxalato)phosphate, lithium difluoro(oxalato)borate, lithium tetrafluorooxalate phosphate, succinonitrile, succinic anhydride, ethylene sulfate, ethylene glycol bis(propionitrile)ether, lithium tetrafluoroborate, fluoroethylene carbonate, and lithium difluorophosphate.

7 . The method of claim 1 , wherein the compound represented by Formula 1 comprises at least one compound selected from the group consisting of LiAlCl 4 -3 (SO 2 ) and NaAlCl 4 -2 (SO 2 ).

8 . The method of claim 1 , wherein the composition for forming an inorganic electrolyte layer further comprises an inorganic ionic liquid.

9 . An electrode for a lithium secondary battery, comprising an electrode current collector, an organic electrolyte layer and an inorganic electrolyte layer on the electrode current collector,
wherein the inorganic electrolyte layer comprises a reduced compound of a compound represented by Formula 1:
MM′X n− m(SO 2 )  [Formula 1]

M is a metallic element selected from the group consisting of lithium (Li), sodium (Na), potassium (K), and rubidium (Rb), M′ is a metallic element selected from the group consisting of aluminum (Al), gallium (Ga), indium (In), and titanium (Ti), X is a halogen element selected from the group consisting of fluorine (F), chlorine (Cl), bromine (Br), and iodine (I), n is an integer of 1 to 6, and m is an integer of 1 to 10.

10 . The electrode for a lithium secondary battery of claim 9 , wherein the organic electrolyte layer and the inorganic electrolyte layer are mixed and present in one layer.

Assignees

• Lg Energy Solution Ltd

Inventors

• Park Sol Ji
• Ahn Kyoung Ho
• Han Jun Hyeok
• Lee Chul Haeng

Classifications

• H01M2300/0094

  in the form of layered products, e.g. coatings · CPC title

• H01M2300/0057

  Chlorides · CPC title

• H01M4/667

  in the form of layers, e.g. coatings · CPC title

• H01M2300/0068

  inorganic · CPC title

• C25D13/22 Primary

  Servicing or operating {apparatus or multistep processes} · CPC title