Sagger for firing secondary battery active material and method for manufacturing secondary battery active material using same

Patent metadata

Field	Value
Publication number	US-2020256620-A1
Application number	US-201716651717-A
Country	US
Kind code	A1
Filing date	Sep 28, 2017
Priority date	Sep 28, 2017
Publication date	Aug 13, 2020
Grant date	—

Abstract

A sagger for firing an object to be fired includes an active material for a secondary battery. Carbon dioxide that is a reaction by-product produced during a positive electrode active material firing process can be smoothly discharged from the sagger, and such a smooth discharge of carbon dioxide can lower a residual lithium concentration of a positive electrode active material and thus can improve dispersibility of a positive electrode active material slurry and also improve capacity of a battery.

First claim

1 . A sagger for firing an object to be fired including an active material for a secondary battery,
the sagger, comprising: a notch portion that is recessed from an upper portion of a side wall thereof to open a portion of the side wall, wherein a ratio of an area of the notch portion to an area of the side wall is 30 to 70%, and an edge at which a side wall of the sagger contacts a lower surface of the sagger is configured by a rounded portion.

2 . The sagger of claim 1 , wherein a radius of curvature of the rounded portion is greater than or equal to 25 mm.

3 . The sagger of claim 1 , wherein the notch portion has a depth of 60 to 90% from an upper surface of the sagger.

4 . The sagger of claim 1 , wherein the sagger comprises at least a pair of opposing side walls, and the notch portion is formed on the at least a pair of opposing side walls.

5 . The sagger of claim 1 , wherein a through-hole is formed on a lower surface of the sagger.

6 . The sagger of claim 1 , wherein the sagger is further provided with a cover for covering an upper surface opened for inflow and outflow of an object to be fired.

7 . The sagger of claim 6 , wherein a through-hole is formed on the cover.

8 . The sagger of claim 1 , wherein the sagger consists of one or more selected from mullite (3Al 2 O 3 2SiO 2 ), cordierite (Mg, Fe +3 ) 2 Al 4 Si 5 O 18 ), spinel (MgAl 2 O 4 ) and zircon (ZrSiO 4 ).

9 . A method for manufacturing an active material for a secondary battery comprising operations of:
loading a raw material into the sagger according to claim 1 and inserting the raw material in a firing furnace and then firing; and recovering the raw material in the sagger after the firing, and cooling and pulverizing to prepare an active material for a secondary battery.

10 . The method for manufacturing the active material for the secondary battery of claim 9 , wherein a size of the raw material to be loaded into the sagger by molding powder is increased.

11 . The method for manufacturing the active material for the secondary battery of claim 9 , wherein the firing is performed in an oxygen atmosphere or an inert gas atmosphere.

12 . The method for manufacturing the active material for the secondary battery of claim 9 , wherein two or more saggers are disposed in the firing furnace.

13 . The method for manufacturing the active material for the secondary battery of claim 9 , wherein the two or more saggers are stacked in two or more layers in the firing furnace and then fired.

Assignees

• Posco
• Res Inst Ind Science & Tech

Inventors

• Park Young-Min
• Kim Woo-Taek
• Kim Hyeon-Woo
• Hwang Soon-Cheol
• Yang Choong-Mo
• Park Yoon-Cheol
• Jung Keeyoung

Classifications

• H01M4/525

  of mixed oxides or hydroxides containing iron, cobalt or nickel for inserting or intercalating light metals, e.g. LiNiO2, LiCoO2 or LiCoOxFy · CPC title

• F27D5/0012

  Modules of the sagger or setter type; Supports built up from them · CPC title

• C01G53/42

  containing alkali metals, e.g. LiNiO2 · CPC title

• C04B2235/9623

  Ceramic setters properties · CPC title

• C04B2235/945

  Products containing grooves, cuts, recesses or protusions · CPC title