Electrode including coating layer for preventing reaction with electrolyte solution

Patent metadata

Field	Value
Publication number	US-2016149220-A1
Application number	US-201414892106-A
Country	US
Kind code	A1
Filing date	Jul 29, 2014
Priority date	Jul 30, 2013
Publication date	May 26, 2016
Grant date	—

Abstract

Disclosed is an electrode for secondary batteries in which an electrode mix layer including an electrode active material is coated on an electrode collector, and a coating layer including aluminum (Al) and/or alumina (Al 2 O 3 ) is formed on the electrode mix layer.

First claim

1 . An electrode for secondary batteries, wherein an electrode mix layer comprising an electrode active material is coated on an electrode collector and a coating layer comprising aluminum (Al) and/or alumina (Al 2 O 3 ) is formed on the electrode mix layer.

2 . The electrode according to claim 1 , wherein the coating layer is formed to a thickness of 0.5 nm to 100 nm.

3 . The electrode according to claim 1 , wherein the coating layer comprises aluminum and alumina.

4 . The electrode according to claim 3 , wherein the aluminum and the alumina in the coating layer form a concentration gradient with respect to a thickness direction.

5 . The electrode according to claim 4 , wherein, in the coating layer, an amount of aluminum decreases and an amount of alumina increases, toward a surface portion of the electrode from a side contacting the electrode mix layer.

6 . The electrode according to claim 4 , wherein, in the coating layer, an amount of aluminum decreases and an amount of alumina increases, toward a side contacting the electrode mix layer and a surface portion of the electrode from the center of the coating layer.

7 . The electrode according to claim 1 , wherein the coating layer is uniformly formed through electrolytic decomposition.

8 . The electrode according to claim 7 , wherein, in the electrolytic decomposition, an aluminum precursor is ionized in a solution for electrolytic decomposition and is reduced to aluminum metal in an electrolytic electrode.

9 . The electrode according to claim 8 , wherein the aluminum precursor is AlCl 3 .

10 . The electrode according to claim 7 , wherein the electrolytic decomposition is performed through a catalyst.

11 . The electrode according to claim 10 , wherein the catalyst is at least one catalyst selected from the group consisting of ZnCl 2 , CoCl 2 , MnCl 2 , NiCl 2 , and SnCl 2 -based catalysts.

12 . The electrode according to claim 1 , wherein the coating layer is partially or entirely formed on a surface of the electrode mix layer.

13 . The electrode according to claim 1 , wherein the electrode active material 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 is at least one monovalent or divalent anion; and 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 b 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 is at least one selected from the group consisting of anions such as PO 4 , BO 3 , CO 3 , F and NO 3 ; and 0<x<1, 0<y≦0.02, 0<y′≦0.02, 0.3≦a≦1.0, 0≦b≦0.7, and a+b=1.

14 . The electrode according to claim 1 , wherein the electrode is a positive electrode.

15 . A method of manufacturing an electrode according to claim 1 , the method comprising:
coating an electrode mix comprising an electrode active material on a collector; preparing a solution comprising an aluminum precursor; and coating aluminum on an electrode mix layer of the coating through electrolytic decomposition using the solution of the preparing.

16 . The method according to claim 15 , wherein, in the electrolytic decomposition of the coating, an aluminum precursor is ionized in a solution for electrolytic decomposition and is reduced to aluminum metal in a working electrode.

17 . The method according to claim 15 , wherein the aluminum precursor is AlCl 3 .

18 . A secondary battery comprising the electrode according to claim 1 .

19 . The secondary battery according to claim 18 , wherein the secondary battery is a lithium ion battery, a lithium ion polymer battery or a lithium polymer battery.

20 . A battery module comprising the secondary battery according to claim 18 as a unit cell.

21 . A battery pack comprising the battery module according to claim 20 .

22 . A device comprising the battery pack according to claim 21 as a power source.

23 . The device according to claim 22 , wherein the device is an electric vehicle, a hybrid electric vehicle, a plug-in hybrid electric vehicle or a system for storing power.

Assignees

• Lg Chemical Ltd

Inventors

• Uhm In Sung
• Kim Je Young
• Kwon Ji Yoon
• Kim Kyoung Ho
• Hah Hoe Jin
• Kim Il Hong

Classifications

• H01M2220/20

  Batteries in motive systems, e.g. vehicle, ship, plane · CPC title

• H01M4/628 Primary

  Inhibitors, e.g. gassing inhibitors, corrosion inhibitors · CPC title

• H01M2220/30

  Batteries in portable systems, e.g. mobile phone, laptop · CPC title

• H01M4/5825

  Oxygenated metallic salts or polyanionic structures, e.g. borates, phosphates, silicates, olivines · CPC title

• H01M4/582

  Halogenides · CPC title